Form 10-Q - Quarterly report [Sections 13 or 15(d)]

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended December 31, 2024

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______________________ to __________________________

Commission File Number 001-31921

Compass Minerals International, Inc.

(Exact name of registrant as specified in its charter)


Delaware			36-3972986
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification Number)

9900 West 109th Street

Suite 100

Overland Park, KS 66210

(913) 344-9200

(Address of principal executive offices, zip code and telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol

Name of each exchange on which registered

Common stock, $0.01 par value

CMP

The New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such

reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes

☑

☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that

the registrant was required to submit such files).

Yes

☑

☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

☐

Accelerated filer

☑

Non-accelerated filer

☐

Smaller reporting company

☐

Emerging growth company

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes

☐

☑

The number of shares outstanding of the registrant’s common stock, $0.01 par value per share, as of February 5, 2025, was 41,504,100 shares.


						COMPASS MINERALS INTERNATIONAL, INC.

TABLE OF CONTENTS


	PART I. FINANCIAL INFORMATION	Page

Item 1.	Financial Statements

	Consolidated Balance Sheets as of December 31, 2024 (unaudited) and September 30, 2024	2

	Consolidated Statements of Operations for the three months ended December 31, 2024 and 2023 (unaudited)	3

	Consolidated Statements of Comprehensive Loss for the three months ended December 31, 2024 and 2023 (unaudited)	4

	Consolidated Statements of Stockholders’ Equity for the three months ended December 31, 2024 and 2023 (unaudited)	5

	Consolidated Statements of Cash Flows for the three months ended December 31, 2024 and 2023 (unaudited)	6

	Notes to Consolidated Financial Statements (unaudited)	7

Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	18

Item 3.	Quantitative and Qualitative Disclosures about Market Risk	29

Item 4.	Controls and Procedures	29

	PART II. OTHER INFORMATION

Item 1.	Legal Proceedings	31

Item 1A.	Risk Factors	31

Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	31

Item 3.	Defaults Upon Senior Securities	31

Item 4.	Mine Safety Disclosures	31

Item 5.	Other Information	31

Item 6.	Exhibits	32

SIGNATURES		33


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PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

CONSOLIDATED BALANCE SHEETS

(in millions, except share data)


	(Unaudited)
	December 31, 2024		September 30, 2024
ASSETS
Current assets:
Cash and cash equivalents	$	45.8	$	20.2
Receivables, less allowance for doubtful accounts of $3.1 and $3.6 at December 31, 2024 and September 30, 2024, respectively	261.7		126.1
Inventories, less allowance of $14.5 and $11.4 at December 31, 2024 and September 30, 2024, respectively	367.1		414.1

Other current assets	23.0		26.9
Total current assets	697.6		587.3
Property, plant and equipment, net	778.6		806.5
Intangible assets, net	80.1		82.5
Goodwill	5.8		6.0

Other noncurrent assets	158.8		157.8
Total assets	$	1,720.9	$	1,640.1

LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current portion of long-term debt	$	8.7	$	7.5
Accounts payable	96.2		82.1
Accrued salaries and wages	15.5		22.6
Income taxes payable	6.0		13.1
Accrued interest	6.0		13.3

Accrued expenses and other current liabilities	162.4		78.4
Total current liabilities	294.8		217.0
Long-term debt, net of current portion	965.7		910.0
Deferred income taxes, net	56.0		56.5
Other noncurrent liabilities	141.4		140.0
Commitments and contingencies (Note 8)
Stockholders’ equity:
Common stock: $0.01 par value, 200,000,000 authorized shares; 42,197,964 issued shares at December 31, 2024 and September 30, 2024	0.4		0.4
Additional paid-in capital	424.3		420.6
Treasury stock, at cost — 732,721 shares at December 31, 2024 and 816,013 shares at September 30, 2024	(10.4)		(10.2)
Retained (loss) earnings	(21.4)		2.2
Accumulated other comprehensive loss	(129.9)		(96.4)
Total stockholders’ equity	263.0		316.6
Total liabilities and stockholders’ equity	$	1,720.9	$	1,640.1

The accompanying notes are an integral part of the consolidated financial statements.


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CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited, in millions, except share and per share data)


	Three Months Ended December 31,
	2024		2023
Sales	$	307.2	$	341.7
Shipping and handling cost	80.6		91.3
Product cost	192.3		179.3
Gross profit	34.3		71.1
Selling, general and administrative expenses	33.3		45.7
Loss on impairments	—		74.8
Other operating expense	0.5		4.2
Operating earnings (loss)	0.5		(53.6)

Other (income) expense:
Interest income	(0.4)		(0.4)
Interest expense	16.9		15.9
(Gain) loss on foreign exchange	(5.2)		1.9


Other expense, net	3.1		0.7
Loss before income taxes	(13.9)		(71.7)
Income tax expense	9.7		3.6
Net loss	$	(23.6)	$	(75.3)





Basic net loss per common share	$	(0.57)	$	(1.83)



Diluted net loss per common share	$	(0.57)	$	(1.83)

Weighted-average common shares outstanding (in thousands):
Basic	41,441		41,205
Diluted	41,441		41,205

The accompanying notes are an integral part of the consolidated financial statements.


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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

(Unaudited, in millions)


	Three Months Ended December 31,
	2024		2023
Net loss	$	(23.6)	$	(75.3)
Other comprehensive income (loss):
Unrealized gain from change in pension obligations, net of tax of $(0.1) for the three months ended December 31, 2024 and 2023, respectively	0.2		0.2
Unrealized loss from change in other postretirement benefits, net of tax of $0.0 for the three months ended December 31, 2024 and 2023	(0.1)		—
Unrealized loss on cash flow hedges, net of tax of $0.0 for the three months ended December 31, 2024 and 2023, respectively	(0.3)		(1.8)
Cumulative translation adjustment	(33.3)		14.6
Comprehensive loss	$	(57.1)	$	(62.3)

The accompanying notes are an integral part of the consolidated financial statements.


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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

For the three months ended December 31, 2024 and 2023

(Unaudited, in millions)


	Common Stock		Additional Paid-In Capital		Treasury Stock		Retained Earnings (Loss)		Accumulated Other Comprehensive Loss		Total
Balance, September 30, 2024	$	0.4	$	420.6	$	(10.2)	$	2.2	$	(96.4)	$	316.6
Comprehensive loss	—		—		—		(23.6)		(33.5)		(57.1)

Shares issued for stock units, net of shares withheld for taxes	—		(0.2)		(0.2)		—		—		(0.4)

Stock-based compensation	—		3.9		—		—		—		3.9
Balance, December 31, 2024	$	0.4	$	424.3	$	(10.4)	$	(21.4)	$	(129.9)	$	263.0


	Common Stock		Additional Paid-In Capital		Treasury Stock		Retained Earnings		Accumulated Other Comprehensive Loss		Total
Balance, September 30, 2023	$	0.4	$	413.1	$	(8.7)	$	220.9	$	(104.7)	$	521.0
Comprehensive (loss) income	—		—		—		(75.3)		13.0		(62.3)
Dividends on common stock ($0.15 per share)	—		—		—		(6.4)		—		(6.4)
Shares issued for stock units, net of shares withheld for taxes	—		(0.2)		(0.6)		—		—		(0.8)

Stock-based compensation	—		11.9		—		—		—		11.9
Balance, December 31, 2023	$	0.4	$	424.8	$	(9.3)	$	139.2	$	(91.7)	$	463.4

The accompanying notes are an integral part of the consolidated financial statements.


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CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, in millions)


	Three Months Ended December 31,
	2024		2023
Cash flows from operating activities:
Net loss	$	(23.6)	$	(75.3)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Depreciation, depletion and amortization	26.8		25.5
Amortization of deferred financing costs	0.8		0.6

Stock-based compensation	3.9		11.9
Deferred income taxes	2.7		0.6
Unrealized foreign exchange (gain) loss	(5.7)		1.7
Loss on impairments	—		74.8



Other, net	(0.9)		1.5
Changes in operating assets and liabilities:
Receivables	(61.3)		(37.6)
Inventories	39.1		7.8
Other assets	(2.0)		4.0
Accounts payable and accrued expenses and other current liabilities	9.1		(65.4)
Other liabilities	7.0		(2.4)
Net cash used in operating activities	(4.1)		(52.3)
Cash flows from investing activities:
Capital expenditures	(21.8)		(48.6)



Other, net	(0.4)		(0.7)
Net cash used in investing activities	(22.2)		(49.3)
Cash flows from financing activities:
Proceeds from revolving credit facility borrowings	140.3		102.4
Principal payments on revolving credit facility borrowings	(100.8)		(31.5)
Proceeds from issuance of long-term debt	19.6		38.4
Principal payments on long-term debt	(1.6)		(1.2)


Dividends paid	—		(6.4)
Deferred financing costs	(2.4)		—

Shares withheld to satisfy employee tax obligations	(0.4)		(0.8)
Other, net	(1.6)		—
Net cash provided by financing activities	53.1		100.9
Effect of exchange rate changes on cash and cash equivalents	(1.2)		0.3
Net change in cash and cash equivalents	25.6		(0.4)
Cash and cash equivalents, beginning of the year	20.2		38.7
Cash and cash equivalents, end of period	$	45.8	$	38.3


Supplemental cash flow information:
Interest paid, net of amounts capitalized	$	23.4	$	23.6
Income taxes paid, net of refunds	$	8.0	$	12.8
Net change to property, plant and equipment through accounts payable and accrued expenses and other current liabilities	$	9.0	$	17.7

The accompanying notes are an integral part of the consolidated financial statements.


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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Accounting Policies and Basis of Presentation:

Compass Minerals International, Inc. (“CMI”), through its subsidiaries (collectively, the “Company”), is a leading global provider of essential minerals focused on safely delivering where and when it matters to help solve nature’s challenges for customers and communities. The Company’s salt products help keep roadways safe during winter weather and are used in numerous other consumer, industrial, chemical and agricultural applications. Its plant nutrition business is the leading North American producer of sulfate of potash (“SOP”), which is used in the production of specialty fertilizers for high-value crops and turf and helps improve the quality and yield of crops, while supporting sustainable agriculture. The Company’s principal products are salt, consisting of sodium chloride and magnesium chloride, and SOP. The Company is also working to develop long-term fire-retardant solutions to help combat wildfires. The Company’s production sites are located in the United States (“U.S.”), Canada and the United Kingdom (“U.K.”). The Company also provides records management services in the U.K. Except where otherwise noted, references to North America include only the continental U.S. and Canada, and references to the U.K. include only England, Scotland and Wales. References to “Compass Minerals,” “our,” “us” and “we” refer to CMI and its consolidated subsidiaries.

CMI is a holding company with no significant operations other than those of its wholly-owned subsidiaries. The consolidated financial statements include the accounts of CMI and its wholly-owned domestic and foreign subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete consolidated financial statements. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements of the Company for the annual period ended September 30, 2024, as filed with the Securities and Exchange Commission (the “SEC”) in its Annual Report on Form 10-K on December 16, 2024 (“2024 Form 10-K”). In the opinion of management, all adjustments, consisting of normal recurring adjustments considered necessary for a fair presentation, have been included.

The Company experiences a substantial amount of seasonality in its sales, including its salt deicing product sales. Consequently, Salt segment sales and operating income are generally higher in the first and second fiscal quarters (ending December 31 and March 31) and lower during the third and fourth fiscal quarters (ending June 30 and September 30). In particular, sales of highway and consumer deicing salt and magnesium chloride products vary based on the severity of the winter conditions in areas where the products are used. Following industry practice in North America and the U.K., the Company seeks to stockpile sufficient quantities of deicing salt throughout the first, third and fourth fiscal quarters (ending December 31, June 30 and September 30) to meet the estimated requirements for the winter season. Production of deicing salt can also vary based on the severity or mildness of the preceding winter season. Due to the seasonal nature of the deicing product lines, operating results for the interim periods are not necessarily indicative of the results that may be expected for the full fiscal year. The Company’s plant nutrition business is also seasonal. As a result, the Company and its customers generally build inventories during the plant nutrition business’ low demand periods of the year (which are typically winter and summer, but can vary due to weather and other factors) to ensure timely product availability during the peak sales seasons (which are typically spring and autumn, but can also vary due to weather and other factors). Lastly, any expected results of the Company’s fire retardant business are also seasonal with peak demand for fire retardant products and services occurring from June through September. The Company does not yet have a contract for fiscal 2025.

Significant Accounting Policies

The Company’s significant accounting policies are detailed in “Note 2 – Summary of Significant Accounting Policies” within Part II, Item 8 of its 2024 Form 10-K. There were no material changes in the Company’s significant accounting policies from those described in its 2024 Form 10-K.

Recent Accounting Pronouncements

In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures”, which updates reportable segment disclosure requirements primarily to include enhanced disclosures about significant segment expenses. The amendments are effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years


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beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements. Management is currently evaluating this ASU to determine its impact on the Company's disclosures.

In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures”, which updates income tax disclosures by requiring consistent categories and additional disaggregation of information in the rate reconciliation and income taxes paid by jurisdiction. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied prospectively; however, retrospective application is permitted. Management is currently evaluating this ASU to determine its impact on the Company’s disclosures.

In November 2024, the FASB issued amended guidance related to disclosure of disaggregated expenses (“ASU 2024-03”). This amendment requires public business entities to provide detailed disclosures in the notes to financial statements disaggregating specific expense categories, including employee compensation, depreciation, and intangible asset amortization, as well as certain other disclosures to provide enhanced transparency into the nature and function of expenses. This new guidance is effective for annual periods beginning in the Company’s fiscal 2028 and interim periods following annual adoption, with early adoption permitted. This guidance will be applied on a prospective basis with retrospective application permitted. Management is currently evaluating this ASU to determine its impact on the Company’s disclosures.

2. Revenues:

Deferred Revenue

Deferred revenue represents collections under non-cancellable contracts before the related product or service is transferred to the customer. The portion of deferred revenue that is anticipated to be recognized as revenue during the succeeding twelve-month period is recorded in accrued expenses and other current liabilities on the Consolidated Balance Sheets. Deferred revenue as of both December 31, 2024 and September 30, 2024 was approximately $3.6 million.

See Note 9 for a disaggregation of sales by segment, type and geographical region.

3. Inventories:

Inventories consist of the following (in millions):


	December 31, 2024		September 30, 2024
Finished goods	$	286.8	$	336.5
Work in process	6.4		6.4
Raw materials and supplies(a)	73.9		71.2
Total inventories	$	367.1	$	414.1

(a)Excludes certain raw materials and supplies of $41.1 million and $42.2 million as of December 31, 2024 and September 30, 2024, respectively, that are not expected to be consumed within the next twelve months, included in Other noncurrent assets in the Consolidated Balance Sheets.


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4. Property, Plant and Equipment, Net:

Property, plant and equipment, net, consists of the following (in millions):


	December 31, 2024		September 30, 2024
Land, buildings and structures, and leasehold improvements	$	550.2	$	559.8
Machinery and equipment	1,120.2		1,149.5
Office furniture and equipment	23.9		24.1
Mineral interests	166.5		170.4
Construction in progress	57.5		56.0
	1,918.3		1,959.8
Less: accumulated depreciation and depletion	(1,139.7)		(1,153.3)
Property, plant and equipment, net	$	778.6	$	806.5

5. Goodwill and Intangible Assets:

Changes in the carrying amount of goodwill are summarized as follows (in millions):


	Corporate & Other
Balance as of September 30, 2024	$	6.0
Foreign currency translation adjustment	(0.2)
Balance as of December 31, 2024	$	5.8

6. Income Taxes:

The Company’s effective income tax rate differs from the U.S. statutory federal income tax rate primarily due to U.S. statutory depletion, state income taxes (net of federal tax benefit), nondeductible executive compensation over $1 million, foreign income, mining and withholding taxes, base erosion and anti-abuse tax, and valuation allowances recorded on deferred tax assets.

The effective tax rates applied to the three months ended December 31, 2024 were determined by excluding the U.S. losses from the overall estimated annual effective tax rate computations and a separate estimated annual effective tax rate was computed and applied to the ordinary U.S. losses.

Management assesses the available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit use of the existing deferred tax assets. A significant piece of objective negative evidence evaluated was the cumulative loss incurred in the U.S. over the three-year period ended December 31, 2024. Such objective evidence limits the ability to consider other subjective evidence, such as the Company’s projections for future income. On the basis of this evaluation, during the three months ended December 31, 2024, an additional valuation allowance of $9.5 million has been recorded to recognize only the portion of the U.S. deferred tax assets that is more likely than not to be realized. The amount of the deferred tax assets considered realizable, however, could be adjusted if objective negative evidence in the form of cumulative losses is no longer present and additional weight is given to subjective evidence such as the Company’s projections for income.

As of December 31, 2024 and September 30, 2024, the Company had $78.4 million and $76.4 million, respectively of gross federal NOL carryforwards that have no expiration date and $6.6 million and $6.1 million at December 31, 2024 and September 30, 2024, respectively of net operating tax-effected state NOL carryforwards which expire beginning in 2031.

Canadian provincial tax authorities have challenged tax positions claimed by one of the Company’s Canadian subsidiaries and have issued tax reassessments for fiscal years 2002-2019. The reassessments are a result of ongoing audits and total $192.8 million, including interest, through December 31, 2024. The Company disputes these reassessments and will continue to work with the appropriate authorities in Canada to resolve the dispute. There is a reasonable possibility that the ultimate resolution of this dispute, and any related disputes for other open tax years, may be materially higher or lower than the amounts the Company has reserved for such disputes. In connection with this dispute, local regulations require the Company to post security with the tax authority until the dispute is resolved. The Company has posted collateral in the form of a $152.3 million performance bond


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and has paid $34.6 million to the Canadian tax authorities (most of which is recorded in other assets in the Consolidated Balance Sheets at December 31, 2024, and September 30, 2024), which is necessary to proceed with future appeals or litigation.

The Company expects that it will be required by local regulations to provide security for additional interest on the above unresolved disputed amounts and for any future reassessments issued by these Canadian tax authorities in the form of cash, letters of credit, performance bonds, asset liens or other arrangements agreeable with the tax authorities until the disputes are resolved.

The Company expects that the ultimate outcome of these matters will not have a material impact on its results of operations or financial condition. However, the Company can provide no assurance as to the ultimate outcome of these matters, and the impact could be material if they are not resolved in the Company’s favor. As of December 31, 2024, the Company believes it has adequately reserved for these reassessments.

Additionally, the Company has other uncertain tax positions as well as assessments and disputed positions with taxing authorities in its various jurisdictions, which are consistent with those matters disclosed in the Company’s 2024 Form 10-K.

7. Long-Term Debt:

Long-term debt consists of the following (in millions):


	December 31, 2024		September 30, 2024
6.75% Senior Notes due December 2027	$	500.0	$	500.0
Term Loan due May 2028	192.5		193.8
Revolving Credit Facility due May 2028	229.6		190.1
AR Securitization Facility expires March 2027	58.2		38.9
	980.3		922.8
Less unamortized debt issuance costs	(5.9)		(5.3)
Total debt	974.4		917.5
Less current portion	(8.7)		(7.5)
Long-term debt	$	965.7	$	910.0

On December 12, 2024, the Company entered into an amendment to its 2023 Credit Agreement, which, among other things, eased the restrictions of certain covenants contained in the agreement. The amendment included increasing the maximum allowed consolidated total net leverage ratio (as defined and calculated under the terms of the amended 2023 Credit Agreement) to 6.5x as of the last day of any quarter through the fiscal quarter ended September 30, 2025, then gradually stepping down to 4.50x for the fiscal quarter ended December 31, 2026 and thereafter. The amendment also decreased the Revolving Commitments (as defined in the Existing Credit Agreement) from $375 million to $325 million with additional reductions stepping down to $250 million on July 1, 2026. In connection with this amendment, the Company paid fees totaling $2.0 million which were capitalized as deferred financing costs. Additional arrangement and legal fees of $1.0 million were expensed as of December 31, 2024.

As of December 31, 2024, the term loan and revolving credit facility under the 2023 Credit Agreement were secured by substantially all existing and future U.S. assets of the Company, the Goderich mine in Ontario, Canada and capital stock of certain subsidiaries. As of December 31, 2024 and September 30, 2024, the weighted average interest rate on all borrowings outstanding under the 2023 Credit Agreement was approximately 7.3% and 7.7%, respectively. Depending on the type, borrowings under the 2023 Credit Agreement accrue interest at a rate per annum equal to the Adjusted Term SOFR Rate, the Adjusted EURIBO Rate, Prime Rate or the CDO Rate (as defined in the credit agreement), as applicable, plus Applicable Margins (as defined in the credit agreement) which resulted in interest rates between 7.2% and 7.6% as of December 31, 2024, and 7.3% and 9.5% as of September 30, 2024.

Outstanding letters of credit totaling $14.9 million as of December 31, 2024 further reduced available borrowing capacity under the Company’s $325 million revolving credit facility to $80.5 million. The 2023 Credit Agreement requires the Company to maintain certain financial ratios, including a minimum interest coverage ratio and a maximum total net leverage ratio. The Company was in compliance as of December 31, 2024 with its debt covenants under the 2023 Credit Agreement and its AR Securitization Facility. The consolidated total net leverage ratio represents the ratio of (a) consolidated total net debt to (b)


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consolidated adjusted earnings before interest, taxes, depreciation and amortization. Consolidated total net debt includes the aggregate principal amount of total debt, net of unrestricted cash not to exceed $75.0 million.

8. Commitments and Contingencies:

On October 21, 2022, a putative securities class was filed in the United States District Court for the District of Kansas. The lawsuit alleges that the Company and certain former executives of the Company made misleading statements and that shareholders were damaged by these statements. Plaintiffs filed an Amended Complaint on March 13, 2023; the Company filed

a Motion to Dismiss on May 12, 2023. On December 12, 2023, the court granted and denied in part the Company’s Motion to Dismiss. On December 29, 2023, the Company filed a request for an interlocutory appeal and a request for a stay of discovery. On March 15, 2024, the Court denied the Company’s request for an interlocutory appeal. The parties participated in a mediation on November 19, 2024; the parties did not resolve the matter at mediation. On February 7, 2024, the parties reached an agreement in principle to resolve the matter and filed a motion to stay discovery. The agreement is preliminary and subject to final documentation, preliminary court approval and final approval after a court hearing. At this time, based on currently available information and its applicable insurance coverage, the Company believes any settlement to be paid will be covered by insurance and does not believe any losses will have a material adverse effect on its results of operations or cash flows in future periods. Additionally, the Company has recorded an estimated liability and estimated insurance recoveries in its Consolidated Balance Sheets as of December 31, 2024.

On February 1, 2023, a shareholder derivative lawsuit was filed in the District of Kansas by an individual shareholder, purportedly on behalf of the Company. The lawsuit alleges that certain directors and executives breached their fiduciary duties to shareholders by failing to prevent the dissemination of misstatements and omissions from October 30, 2017, to November 18, 2018. The parties have stipulated to stay this matter through the discovery stage of the putative securities class action. On October 30, 2024, an additional shareholder derivative lawsuit was filed in the District of Kansas by an individual shareholder, purportedly on behalf of the Company. The lawsuit alleges that certain directors and executives breached their fiduciary duties to shareholders by willfully or recklessly causing the Company to make false and/or misleading statements and/or omissions of material fact from October 31, 2017, to October 21, 2022.

The Company is also involved in legal and administrative proceedings and claims of various types from the ordinary course of the Company’s business.

Management cannot predict the outcome of legal claims and proceedings with certainty. Nevertheless, management believes that the outcome of legal proceedings and claims, which are pending or known to be threatened, even if determined adversely, will not, individually or in the aggregate, have a material adverse effect on the Company’s results of operations, cash flows or financial position, except as otherwise described in Note 6 and this Note 8.

The Company also has contingent consideration liabilities related to the Fortress North America, LLC (“Fortress”) acquisition. Refer to Note 12 for additional information.

On October 25, 2024, the Company issued a recall for nine production lots of food-grade salt produced at its Goderich Plant following a customer report of a non-organic, foreign material in its product. The products recalled included both products sold prior and subsequent to September 30, 2024. The Company followed recall protocol and notified its BRCGS Global Standard for Food Safety certifying body, the Canadian Food Inspection Agency (“CFIA”) and the U.S. Food and Drug Administration (“FDA”). The Company has been working to obtain and assess the reported foreign material, complete the necessary investigation, and determine the next steps. For the three months ended December 31, 2024, the Company recognized $0.9 million for costs related to the recall on the Consolidated Statements of Operations, a portion of which the Company believes is reimbursable by insurance. Additionally, as of December 31, 2024, the Company has recorded a liability of $35.0 million and estimated insurance recoveries of $35.0 million in its Consolidated Balance Sheets associated with customer claims.

The Company continues to assess the scope and magnitude of additional customer claims. At this time, based on currently available information and its applicable insurance coverage, the Company does not believe any incremental losses will have a material adverse effect on its results of operations or cash flows in future periods.


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9. Operating Segments:

The Company’s reportable segments are strategic business units that offer different products and services, and each business requires different technology and marketing strategies. For the three months ended December 31, 2024 and 2023, the Company has presented two reportable segments in its Consolidated Financial Statements: Salt and Plant Nutrition. The Salt segment produces and markets salt, consisting of sodium chloride and magnesium chloride, for use in road deicing for winter roadway safety and for dust control, food processing, water softening and other consumer, agricultural and industrial applications. The Plant Nutrition segment produces and markets various grades of SOP. The results of operations for the Company’s fire retardant and records management businesses are included in Corporate and Other in the tables below.

Segment information is as follows (in millions):


Three Months Ended December 31, 2024	Salt		Plant Nutrition		Corporate & Other(a)		Total
Sales to external customers	$	242.2	$	61.4	$	3.6	$	307.2
Intersegment sales	—		3.2		(3.2)		—
Shipping and handling cost	71.3		9.3		—		80.6
Operating earnings (loss)(b)	29.4		(3.1)		(25.8)		0.5
Depreciation, depletion and amortization	17.5		7.5		1.8		26.8
Total assets (as of end of period)	1,092.4		388.1		240.4		1,720.9


Three Months Ended December 31, 2023	Salt		Plant Nutrition		Corporate & Other(a)		Total
Sales to external customers	$	274.3	$	49.7	$	17.7	$	341.7
Intersegment sales	—		3.1		(3.1)		—
Shipping and handling cost	83.7		7.0		0.6		91.3
Operating earnings (loss)(b)(c)	50.9		(2.3)		(102.2)		(53.6)
Depreciation, depletion and amortization	15.2		8.4		1.9		25.5
Total assets (as of end of period)	1,056.6		469.7		278.9		1,805.2

Disaggregated revenue by product type is as follows (in millions):


Three Months Ended December 31, 2024	Salt		Plant Nutrition		Corporate & Other(a)		Total
Highway Deicing Salt	$	138.1	$	—	$	—	$	138.1
Consumer & Industrial Salt	104.1		—		—		104.1


SOP	—		64.6		—		64.6


Eliminations & Other	—		(3.2)		3.6		0.4
Sales to external customers	$	242.2	$	61.4	$	3.6	$	307.2


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Three Months Ended December 31, 2023	Salt		Plant Nutrition		Corporate & Other(a)		Total
Highway Deicing Salt	$	159.4	$	—	$	—	$	159.4
Consumer & Industrial Salt	114.9		—		—		114.9


SOP	—		52.8		—		52.8
Fire Retardant	—		—		14.0		14.0
Revenue from Services	—		—		0.5		0.5
Eliminations & Other	—		(3.1)		3.2		0.1
Sales to external customers	$	274.3	$	49.7	$	17.7	$	341.7

(a)Corporate and Other includes corporate entities, records management operations, the Fortress fire retardant business, equity method investments, prior-year lithium costs and other incidental operations and eliminations. Operating earnings (loss) for corporate and other includes indirect corporate overhead, including costs for general corporate governance and oversight, prior-year lithium-related expenses, as well as costs for the human resources, information technology, legal and finance functions.

(b)Corporate operating results were impacted by costs related to a product recall of $0.9 million for the three months ended December 31, 2024. Corporate operating results were also impacted by a net loss of $1.6 million related to an increase in the valuation of the Fortress contingent consideration for the three months ended Dec. 31, 2023.

(c)As a result of the Company’s decision to cease the pursuit of the lithium development, the Company recognized an impairment of long-lived assets of $74.8 million for the three months ended December 31, 2023. The Company also recognized severance of $2.5 million related to the termination of the lithium development and $1.1 million related to other restructuring, which impacted operating results for the three months ended December 31, 2023.

The Company’s revenue by geographic area is as follows (in millions):


	Three Months Ended December 31,
Revenue	2024		2023
United States(a)	$	212.7	$	250.9
Canada	79.3		77.6
United Kingdom	11.2		13.0
Other	4.0		0.2
Total revenue	$	307.2	$	341.7

(a)United States sales exclude product sold to foreign customers at U.S. ports.

10. Stockholders’ Equity and Equity Instruments:

Equity Compensation Awards

In May 2020, the Company’s stockholders approved the 2020 Incentive Award Plan (as amended, the “2020 Plan”), which authorized the issuance of 2,977,933 shares of Company common stock. In February 2022, the Company’s stockholders approved an amendment to the 2020 Plan authorizing an additional 750,000 shares of Company stock. In March 2024, the Company’s stockholders approved an amendment to the 2020 Plan authorizing an additional 3,000,000 shares of Company stock. Since the date the 2020 Plan was approved, the Company ceased issuing equity awards under the 2015 Incentive Award Plan (as amended, the “2015 Plan”). Since the approval of the 2015 Plan in May 2015, the Company ceased issuing equity awards under the 2005 Incentive Award Plan (as amended, the “2005 Plan”). The 2005 Plan, the 2015 Plan and the 2020 Plan allow for grants of equity awards to executive officers, other employees and directors, including restricted stock units (“RSUs”), performance stock units (“PSUs”), stock options and deferred stock units. For additional information regarding equity awards issued under the Company’s incentive plans refer to “Note 15 – Stockholder’s Equity and Equity Instruments” within Part II, Item 8 of its 2024 Form 10-K.

During the three months ended December 31, 2024, the Company reissued the following number of shares from treasury stock: 108,023 shares related to the release of RSUs which vested and 10,224 shares issued for Board of Director compensation. In fiscal 2024, the Company issued 222,155 net shares from treasury stock. The Company withheld a total of 34,955 shares with a fair value of $0.5 million related to the vesting of RSUs during the three months ended December 31, 2024. The fair value of the shares was valued at the closing price at the vesting date and represent the employee tax withholding for the employee’s compensation. The Company recognized tax expense of $0.5 million from its equity compensation awards during the three months ended December 31, 2024. During the three months ended December 31, 2024 and 2023, the Company recorded


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$3.9 million and $11.9 million, respectively, of compensation expense pursuant to its stock-based compensation plans. No amounts have been capitalized.

PSUs

During the three months ended December 31, 2024, the Company issued new PSUs based upon performance criteria and metrics (“Scorecard PSUs”). The actual number of shares of common stock that may be earned with respect to Scorecard PSUs is calculated based upon the attainment of certain thresholds for free cash flow and return on capital employed during each year of the three-year performance period and may range from 0% to 200% for each measure. Additionally, a modifier will increase or decrease the payout by 20% based upon relative total shareholder return against the Company’s peer group.

The following table summarizes stock-based compensation activity during the three months ended December 31, 2024:


	Stock Options			RSUs			PSUs(a)
	Number	Weighted-average exercise price		Number	Weighted-average fair value		Number	Weighted-average fair value
Outstanding at September 30, 2024	187,023	$	62.85	451,091	$	27.93	229,469	$	40.26
Granted	—	—		749,627	12.83		214,673	16.57
Exercised(b)	—	—		—	—		—	—
Released from restriction(b)	—	—		(108,023)	32.70		—	—
Cancelled/expired	(3,279)	64.12		(5,843)	18.03		—	—
Outstanding at December 31, 2024	183,744	$	62.83	1,086,852	$	17.09	444,142	$	28.81

(a)Until the performance period is completed, PSUs are included in the table at the target level at their grant date and at that level represent one share of common stock per PSU.

(b)Common stock issued for exercised options and for vested and earned RSUs and PSUs was issued from treasury stock.

Accumulated Other Comprehensive Loss (“AOCL”)

The Company’s comprehensive income (loss) is comprised of net loss, net amortization of the unrealized loss of the pension obligation, the change in the unrealized gain in other postretirement benefits, the change in the unrealized gain (loss) on natural gas and foreign currency cash flow hedges and currency translation adjustment (“CTA”). The components of and changes in AOCL are as follows (in millions):


Three Months Ended December 31, 2024(a)	Gains and (Losses) on Cash Flow Hedges		Defined Benefit Pension		Other Post-Employment Benefits		Foreign Currency		Total
Beginning balance	$	(1.3)	$	(6.2)	$	1.4	$	(90.3)	$	(96.4)
Other comprehensive loss before reclassifications(b)	(0.9)		—		—		(33.3)		(34.2)
Amounts reclassified from AOCL	0.6		0.2		(0.1)		—		0.7
Net current period other comprehensive income (loss)	(0.3)		0.2		(0.1)		(33.3)		(33.5)
Ending balance	$	(1.6)	$	(6.0)	$	1.3	$	(123.6)	$	(129.9)


Three Months Ended December 31, 2023(a)	Gains and (Losses) on Cash Flow Hedges		Defined Benefit Pension		Other Post-Employment Benefits		Foreign Currency		Total
Beginning balance	$	(1.4)	$	(6.6)	$	1.7	$	(98.4)	$	(104.7)
Other comprehensive income before reclassifications(b)	(2.6)		—		—		14.6		12.0
Amounts reclassified from AOCL	0.8		0.2		—		—		1.0
Net current period other comprehensive income	(1.8)		0.2		—		14.6		13.0
Ending balance	$	(3.2)	$	(6.4)	$	1.7	$	(83.8)	$	(91.7)

(a)With the exception of the CTA, for which no tax effect is recorded, the changes in the components of AOCL presented in the tables above are reflected net of applicable income taxes.

(b)The Company recorded foreign exchange gain (loss) of $5.4 million and $(2.3) million in the three months ended December 31, 2024 and 2023, respectively, in AOCL related to intercompany notes which were deemed to be of a long-term investment nature.


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The amounts reclassified from AOCL to expense (income) for the three months ended December 31, 2024 and 2023, are shown below (in millions):


	Amount Reclassified from AOCL
	Three Months Ended December 31,				Line Item Impacted in the Consolidated Statements of Operations
	2024		2023
Loss (gain) on cash flow hedges:
Natural gas instruments	$	0.6	$	0.8		Product cost

Income tax expense	—		—
Reclassifications, net of income taxes	0.6		0.8
Amortization of defined benefit pension:
Amortization of loss	0.3		0.3			Product cost
Income tax benefit	(0.1)		(0.1)
Reclassifications, net of income taxes	0.2		0.2
Amortization of other post-employment benefits:
Amortization of gain	(0.1)		—			Product cost
Income tax expense	—		—
Reclassifications, net of income taxes	(0.1)		—

Total reclassifications, net of income taxes	$	0.7	$	1.0

11. Derivative Financial Instruments:

The Company is subject to various types of market risks, including interest rate risk, foreign currency exchange rate transaction and translation risk and commodity pricing risk. Management may take actions to mitigate the exposure to these types of risks, including entering into forward purchase contracts and other financial instruments. The Company manages a portion of its commodity pricing risks and foreign currency exchange rate risks by using derivative instruments. From time to time, the Company may enter into foreign exchange contracts to mitigate foreign exchange risk. The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangement. The Company enters into natural gas derivative instruments and foreign currency derivative instruments with counterparties it views as creditworthy. However, the Company does attempt to mitigate its counterparty credit risk exposures by, among other things, entering into master netting agreements with some of these counterparties. The Company records derivative financial instruments as either assets or liabilities at fair value in its Consolidated Balance Sheets. The assets and liabilities recorded as of December 31, 2024 and September 30, 2024 were not material.

Derivatives qualify for treatment as hedges when there is a high correlation between the change in fair value of the derivative instrument and the related change in value of the underlying hedged item. Depending on the exposure being hedged, the Company must designate the hedging instrument as a fair value hedge, a cash flow hedge or a net investment in foreign operations hedge. For the qualifying derivative instruments that have been designated as cash flow hedges, the effective portion of the change in fair value is recognized through earnings when the underlying transaction being hedged affects earnings, allowing a derivative’s gains and losses to offset related results from the hedged item in the Consolidated Statements of Operations. Any ineffectiveness related to these instruments accounted for as hedges was not material for any of the periods presented. For derivative instruments that have not been designated as hedges, the entire change in fair value is recorded through earnings in the period of change.

Natural Gas Derivative Instruments

Natural gas is consumed at several of the Company’s production facilities, and changes in natural gas prices impact the Company’s operating margin. The Company seeks to reduce the earnings and cash flow impacts of changes in market prices of natural gas by fixing the purchase price of up to 90% of its forecasted natural gas usage. It is the Company’s policy to consider hedging portions of its natural gas usage up to 36 months in advance of the forecasted purchase. As of December 31, 2024, the Company had entered into natural gas derivative instruments to hedge a portion of its natural gas purchase requirements through September 2026. As of December 31, 2024 and September 30, 2024, the Company had agreements in place to hedge forecasted natural gas purchases of 2.6 million and 2.3 million MMBtus, respectively. All natural gas derivative instruments held by the Company as of December 31, 2024 and September 30, 2024 qualified and were designated as cash flow hedges. As


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of December 31, 2024, the Company expects to reclassify from AOCL to earnings during the next twelve months $1.7 million of net losses on derivative instruments related to its natural gas hedges. Refer to Note 12 for the estimated fair value of the Company’s natural gas derivative instruments as of December 31, 2024 and September 30, 2024.

The following tables present the fair value of the Company’s derivatives (in millions):


	Asset Derivatives			Liability Derivatives
	Consolidated Balance Sheet Location	December 31, 2024		Consolidated Balance Sheet Location	December 31, 2024
Derivatives designated as hedging instruments:
Commodity contracts	Other current assets	$	0.3	Accrued expenses and other current liabilities	$	2.0
Commodity contracts	Other assets	0.3		Other noncurrent liabilities	0.2
Total derivatives(a)		$	0.6		$	2.2

(a)The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheets $0.6 million of its commodity contracts that are in receivable positions against its contracts in payable positions.


	Asset Derivatives			Liability Derivatives
	Consolidated Balance Sheet Location	September 30, 2024		Consolidated Balance Sheet Location	September 30, 2024
Derivatives designated as hedging instruments:
Commodity contracts	Other current assets	$	0.5	Accrued expenses and other current liabilities	$	1.7
Commodity contracts	Other assets	0.1		Other noncurrent liabilities	0.2
Total derivatives(a)		$	0.6		$	1.9

12. Fair Value Measurements:

The Company’s financial instruments are measured and reported at their estimated fair values. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction. When available, the Company uses quoted prices in active markets to determine the fair values for its financial instruments (Level 1 inputs) or, absent quoted market prices, observable market-corroborated inputs over the term of the financial instruments (Level 2 inputs). The Company does not have any unobservable inputs that are not corroborated by market inputs (Level 3 inputs), except as stated below.

The Company holds marketable securities associated with its defined contribution and pre-tax savings plans, which are valued based on readily available quoted market prices. The Company utilizes derivative instruments to manage its risk of changes in natural gas prices and foreign exchange rates (see Note 11). The fair values of the natural gas and foreign currency derivative instruments are determined using market data of forward prices for all of the Company’s contracts.


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The estimated fair values for each type of instrument are presented below (in millions):


	December 31, 2024		Level One		Level Two		Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)	$	3.4	$	3.4	$	—	$	—
Derivatives – natural gas instruments, net	0.6		—		0.6		—
Total Assets	$	4.0	$	3.4	$	0.6	$	—
Liability Class:
Derivatives - natural gas instruments, net	$	(2.2)	$	—	$	(2.2)	$	—

Liabilities related to non-qualified savings plan	(3.4)		(3.4)		—		—

Total Liabilities	$	(5.6)	$	(3.4)	$	(2.2)	$	—

(a)Includes mutual fund investments of approximately 25% in common stock of large-cap U.S. companies, 5% in common stock of small to mid-cap U.S. companies, 10% in bond funds, 20% in short-term investments and 40% in blended funds.


	September 30, 2024		Level One		Level Two		Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)	$	3.1	$	3.1	$	—	$	—
Derivatives - natural gas instruments, net	0.6		—		0.6		—
Total Assets	$	3.7	$	3.1	$	0.6	$	—
Liability Class:
Derivatives - natural gas instruments, net	$	(1.9)	$	—	$	(1.9)	$	—
Liabilities related to non-qualified savings plan	(3.1)		(3.1)		—		—
Total Liabilities	$	(5.0)	$	(3.1)	$	(1.9)	$	—

(a)Includes mutual fund investments of approximately 35% in the common stock of large-cap U.S. companies, 5% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 10% in bond funds, 5% in short-term investments and 40% in blended funds.

Cash and cash equivalents, receivables (net of allowance for doubtful accounts) and accounts payable are carried at cost, which approximates fair value due to their liquid and short-term nature. The Company’s investments related to its non-qualified retirement plan of $3.4 million at December 31, 2024 and $3.1 million at September 30, 2024, are stated at fair value based on quoted market prices. As of December 31, 2024 and September 30, 2024, the estimated fair value of the Company’s fixed-rate 6.75% Senior Notes due December 2027, based on available trading information (Level 2), totaled $492.5 million and $497.0 million, respectively, compared with the aggregate principal amount at maturity of $500.0 million. The fair value at December 31, 2024 and September 30, 2024 of amounts outstanding under the Company’s term loans and revolving credit facility, based upon available bid information received from the Company’s lender (Level 2), totaled approximately $416.8 million and $379.1 million, respectively, compared with the aggregate principal amount at maturity of $422.1 million and $383.9 million, respectively.

In connection with the acquisition of Fortress on May 5, 2023, the Company entered into a contingent consideration arrangement for up to $28 million to be paid in cash and/or Compass Minerals common stock upon the achievement of certain performance measures over the next five years, and a cash earn-out based on volumes of certain Fortress fire retardant products sold over a 10-year period. The fair value of the milestone contingent consideration is estimated using a probability-weighted discounted cash flow model with significant inputs not observable in the market and is therefore considered a Level 3 measurement while the earn-out is valued using a Monte Carlo simulation, also a Level 3 measurement. For the three months ended December 31, 2024, the total fair value of the contingent consideration did not change. For the three months ended December 31, 2023, the Company recorded an expense of $1.6 million. The change in the three months ended December 31, 2023 was reflective of updated financial performance, changes in discount rates and the passage of time. The change is recorded in other operating (income) expense in the Consolidated Statements of Operations to reflect the contingent consideration liability at its fair value as of December 31, 2023. The Company will continue to recognize remeasurement changes in the estimated fair value of contingent consideration in earnings at each reporting date until all contingencies are resolved.


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The following table presents the fair value of the Company’s total contingent consideration arrangement (in millions):


Consolidated Balance Sheet Location	December 31, 2024		September 30, 2024
Accrued expenses and other current liabilities	$	0.1	$	—
Other noncurrent liabilities	7.8		7.9
Total contingent consideration	$	7.9	$	7.9

The Company has certain assets, including goodwill and other intangible assets, which are measured at fair value on a non-recurring basis and are adjusted to fair value only if an impairment charge is recognized. The categorization of the framework used to measure fair value of the assets is considered to be within the Level 3 valuation hierarchy due to the subjective nature of the unobservable inputs used. Refer to Note 5 for details of the Company’s remaining goodwill.

13. Earnings per Share:

On April 22, 2024, the Board of Directors determined not to declare dividends for the foreseeable future in order to align the Company’s capital allocation priorities with its corporate focus on accelerating cash flow generation and debt reduction. The Company calculated earnings per share using the treasury stock method during the three months ended December 31, 2024. The following table sets forth the computation of basic and diluted earnings per common share (in millions, except for share and per-share data):


	Three Months Ended December 31,
	2024		2023
Numerator:
Net loss	$	(23.6)	$	(75.3)
Less: net earnings allocated to participating securities(a)	—		(0.1)


Net loss available to common stockholders	$	(23.6)	$	(75.4)

Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share(b)	41,441		41,205
Weighted-average awards outstanding	—		—
Shares for diluted earnings per share	41,441		41,205



Basic net loss per common share	$	(0.57)	$	(1.83)



Diluted net loss per common share	$	(0.57)	$	(1.83)

(a)Weighted participating securities include RSUs and PSUs that receive non-forfeitable dividends and consist of 1,116,000 weighted participating securities for the three months ended December 31, 2024 and 777,000 weighted participating securities for the three months ended December 31, 2023.

(b)For the calculation of diluted net earnings (loss) per share, the Company uses the more dilutive of either the treasury stock method or the two-class method to determine the weighted-average number of outstanding common shares. In addition, the Company had 1,184,000 weighted-average equity awards outstanding for the three months ended December 31, 2024, and 1,572,000 weighted-average equity awards outstanding for the three months ended December 31, 2023, that were anti-dilutive.

14. Related Party Transactions:

During both the three months ended December 31, 2024 and 2023, the Company recorded SOP sales of approximately $1.1 million and $0.8 million, respectively, to certain subsidiaries of Koch Industries, Inc. As of December 31, 2024 and September 30, 2024, the Company had approximately $0.6 million and $0.3 million, respectively, of receivables from related parties on its Consolidated Balance Sheets. There were no amounts payable outstanding as of December 31, 2024.


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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

All statements, other than statements of historical fact, contained in this Quarterly Report on Form 10-Q constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995.

Forward-looking statements relate to future events or our future financial performance, and involve known and unknown risks, uncertainties, and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements. Factors that could cause actual results to differ materially from those expressed or implied by the forward-looking statements include, but are not limited to, the following: our mining and industrial operations; geological conditions; weather conditions; our continued ability to access ambient lake brine in the Great Salt Lake; dependency on a limited number of key production and distribution facilities and critical equipment; the inability to fund necessary capital expenditures or successfully complete capital projects; uncertainties in estimating our economically recoverable reserves and resources; the useful life of our mine properties; conversion of mineral resources into mineral reserves; strikes, other forms of work stoppage or slowdown or other union activities; supply constraints or price increases for energy and raw materials used in our production processes; our indebtedness and inability to pay our indebtedness; restrictions in our debt agreements that may limit our ability to operate our business or require accelerated debt payments; tax liabilities; the inability of our customers to access credit or a default by our customers of trade credit extended by us; our payment of any dividends; financial assurance requirements; the seasonal demand for our products; the impact of anticipated changes in potash product prices and customer application rates; the impact of competition on the sales of our products; inflation risks; increasing costs or a lack of availability of transportation services; risks associated with our international operations and sales, including changes in currency exchange rates; conditions in the sectors where we sell products and supply and demand imbalances for competing products; our rights and governmental authorizations to mine and operate our properties; risks related to unanticipated litigation or investigations or pending litigation or investigations or other contingencies; compliance with environmental, health and safety laws and regulations; environmental liabilities; compliance with foreign and United States (“U.S.”) laws and regulations related to import and export requirements and anti-corruption laws; changes in laws, industry standards and regulatory requirements; product liability claims and product recalls; misappropriation or infringement claims relating to intellectual property; inability to obtain required product registrations or increased regulatory requirements; our ability to successfully implement our strategies; risks related to labor shortages and the loss of key personnel; a compromise of our computer systems, information technology or operations technology or the inability to protect confidential or proprietary data; climate change and related laws and regulations; our ability to expand our business through acquisitions and investments, realize anticipated benefits from acquisitions and investments and integrate acquired businesses; outbreaks of contagious disease or similar public health threats; domestic and international general business and economic conditions; our ability to successfully remediate the material weakness in our internal controls over financial reporting disclosed in this Form 10-Q; and other risks referenced from time to time in this report and our other filings with the Securities and Exchange Commission (the “SEC”), including Part I, Item 1A, “Risk Factors” of our Annual Report on Form 10-K for the annual period ended September 30, 2024 (“2024 Form 10-K”).

In some cases, you can identify forward-looking statements by terminology such as “may,” “might,” “will,” “should,” “could,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue,” the negative of these terms or other comparable terminology. Forward-looking statements include without limitation statements about our outlook, including expected sales volumes and costs; existing or potential capital expenditures; capital projects and investments; the industry and our competition; projected sources of cash flow; potential legal liability; proposed or recently enacted legislation and regulatory action; the seasonal distribution of working capital requirements; our reinvestment of foreign earnings outside the U.S.; payment of future dividends and ability to reinvest in our business; our ability to optimize cash accessibility, minimize tax expense and meet debt service requirements; future tax payments, tax refunds and valuation allowances; leverage ratios; realization of potential savings from our restructuring activities; outcomes of matters with taxing authorities; the effects of currency fluctuations and inflation, including our ability to recover inflation-based cost increases; the seasonality of our business; and the effects of climate change. These forward-looking statements are only predictions. Actual events or results may differ materially.

Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity, performance or achievements. We undertake no duty to update any of the forward-looking statements after the date hereof or to reflect the occurrence of unanticipated events.

Unless the context requires otherwise, references to the “Company,” “Compass Minerals,” “our,” “us” and “we” refer to Compass Minerals International, Inc. (“CMI,” the parent holding company) and its consolidated subsidiaries. Except where otherwise noted, references to North America include only the continental U.S. and Canada, and references to the United Kingdom (“U.K.”) include only England, Scotland and Wales. Except where otherwise noted, all references to tons refer to “short tons” and all amounts are in U.S. dollars. One short ton equals 2,000 pounds and one metric ton equals 2,204.6 pounds.


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Compass Minerals and Protassium+ and combinations thereof, are trademarks of CMI or its subsidiaries in the U.S. and other countries.

Critical Accounting Estimates

The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the reporting date and the reported amounts of revenue and expenses during the reporting period. Actual results could vary from these estimates. We have identified the critical accounting policies and estimates that we believe are most important to the portrayal of our financial condition and results of operations. The policies set forth below require significant subjective or complex judgments by management, often as a result of the need to make estimates about the effect of matters that are inherently uncertain.

A discussion of our critical accounting estimates used in preparation of our consolidated financial statements is presented under the heading "Management’s Discussion of Critical Accounting Policies and Estimates" in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in our 2024 Form 10-K.

Company Overview

Compass Minerals is a leading global provider of essential minerals, including salt, sulfate of potash (“SOP”) specialty fertilizer and magnesium chloride. As of December 31, 2024, we operate 12 production and packaging facilities, including:

•The largest rock salt mine in the world in Goderich, Ontario, Canada;

•The largest dedicated rock salt mine in the U.K. in Winsford, Cheshire;

•A solar evaporation facility located near Ogden, Utah, which is both the largest sulfate of potash specialty fertilizer production site and the largest solar salt production site in the Western Hemisphere; and

•Several mechanical evaporation facilities producing consumer and industrial salt.

Our Salt segment provides highway deicing salt to customers in North America and the U.K. as well as consumer deicing and water conditioning products, ingredients used in consumer and commercial food preparation, and other salt-based products for consumer, industrial, chemical and agricultural applications in North America. In the U.K., we operate a records management business utilizing excavated areas of our Winsford salt mine with one other location in London, England.

Our Plant Nutrition segment produces and markets SOP products in various grades worldwide to distributors and retailers of crop inputs, as well as growers and for industrial uses. We market our SOP under the trade name Protassium+®.

In May 2023, we completed the purchase of Fortress North America, LLC (“Fortress”), a fire retardant company working to develop long-term aerial and ground fire retardant products to help combat wildfires.


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Consolidated Results of Continuing Operations

The following is a summary of our consolidated results of continuing operations for the three months ended December 31, 2024 and 2023, respectively. The following discussion should be read in conjunction with the information contained in our consolidated financial statements and the notes thereto included in this Quarterly Report on Form 10-Q.

THREE MONTHS ENDED DECEMBER 31

* Refer to “—Reconciliation of Net Earnings (Loss) from Continuing Operations to EBITDA and Adjusted EBITDA” for a reconciliation to the most directly comparable U.S. GAAP financial measure and the reasons we use this non-GAAP measure.

Commentary: Three Months Ended December 31, 2024 Compared to Three Months Ended December 31, 2023

•Total sales decreased 10%, or $34.5 million, due to lower Salt segment sales, which was partially offset by higher Plant Nutrition segment sales. The decrease in sales for Salt reflected lower deicing sales volumes, which was partially offset by slightly higher average sales prices. We recognized $14.5 million in sales related to the completion of our 2023 contract with the U.S. Forest Service (“USFS”) in the prior-year period. Fortress has not been awarded a contract for either the 2024 or 2025 fire seasons. Plant Nutrition sales increased from the prior year due to a substantial increase in sales volumes, partially offset by lower average sales prices.

•Operating earnings of $0.5 million improved $54.1 million from an operating loss of $53.6 million in the prior-year period, primarily reflecting the lithium asset impairment in the prior-year period and lower corporate SG&A expenses in the current period, which was partially offset by lower Salt operating earnings and Fortress earnings in the current period. Salt earnings decreased due to lower sales volumes and higher per-unit product costs. Plant Nutrition operating loss was essentially flat compared to the prior period as higher sales volumes and lower per-unit product costs were offset by lower average sales prices.

•Earnings before interest, taxes, depreciation and amortization (“EBITDA”)* adjusted for items management believes are not indicative of our ongoing operating performance (“Adjusted EBITDA”)* decreased 48.4%, or $30.1 million.

•Diluted net loss per common share of $0.57 changed by $1.26 from net loss of $1.83 per common share in the prior-year period.


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THREE MONTHS ENDED DECEMBER 31

Commentary: Three Months Ended December 31, 2024 Compared to Three Months Ended December 31, 2023

Gross Profit: Decreased 52%, or $36.8 million; Gross Margin decreased 10 percentage points to 11%

•Salt segment gross profit decreased $22.1 million primarily due to lower sales volumes and higher per-unit product costs, which were partially offset by slightly higher average sales prices (see Salt operating results).

•The gross profit of the Plant Nutrition segment decreased $1.3 million as lower average sales prices were mostly offset by higher sales volumes and lower per-unit product costs (see Plant Nutrition operating results).

•Gross profit was also negatively impacted by earnings in the prior period related to the Fortress fire retardant business acquired in May 2023.

OTHER EXPENSES AND INCOME

Commentary: Three Months Ended December 31, 2024 Compared to Three Months Ended December 31, 2023

SG&A: Decreased $12.4 million; Decreased 2.6 percentage points as a percentage of sales from 13.4% to 10.8%

•The decrease in SG&A expense was primarily due to lower corporate incentive compensation, lithium and Fortress expenses.

Other Operating Expense: Decreased $3.7 million from $4.2 million to $0.5 million

•The decrease in other operating expense was primarily the result of higher contingent consideration related to the Fortress acquisition and severance costs resulting from the decision to discontinue lithium development in the prior period.

Interest Expense: Increased $1.0 million to $16.9 million

•Interest expense increased $1.0 million due to higher interest rates and debt levels in the current period.

(Gain) Loss on Foreign Exchange: Increased $7.1 million from a loss of $1.9 million to a gain of $5.2 million

•We realized a gain on foreign exchange of $5.2 million in the first quarter of fiscal 2025 compared to a loss of $1.9 million in the same quarter of the prior-year period, primarily reflecting the translation of our intercompany loans from Canadian dollars to U.S. dollars.

Other Expense, net: Increased $2.4 million to $3.1 million

•The increase is due primarily to fees paid to modify our debt agreements in the current period, which was partially offset by losses on cash flow hedges in the prior period.

Income Tax Expense: Increased $6.1 million from $3.6 million to $9.7 million

•Tax expense increased by $6.1 million for the three months ended December 31, 2024 versus the 3 months ended December 31, 2023 despite a decrease in pretax book losses of $57.8 million primarily due to the significant Lithium impairment in the three months ended December 31, 2023 for which a full valuation allowance was recorded.

•Our effective tax rate was (70%) for the three months ended December 31, 2024, which is primarily driven by the income mix by country with income recognized in foreign jurisdictions, for which tax expense was recorded, offset by


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losses recognized in the U.S. for which a valuation allowance has been recorded against the U.S. tax benefit carryforward.

•Our income tax provision for the three months ended December 31, 2024 and 2023 differs from the U.S. statutory rate primarily due to U.S. statutory depletion, state income taxes, nondeductible executive compensation, foreign income, mining and withholding taxes and valuation allowance expense. The income tax provision for the three months ended December 31, 2024 also included base erosion and anti-abuse tax.

Operating Segment Performance

The following financial results represent consolidated financial information with respect to the operations of our Salt and Plant Nutrition segments. Sales primarily include revenue from the sales of our products, or “product sales,” and the impact of shipping and handling costs incurred to deliver our salt and plant nutrition products to our customers.

The results of operations of the Fortress business include sales of $14.5 million for the three months ended December 31, 2023. The results of operations of the consolidated records management business and other incidental revenues include sales of $3.6 million and $3.2 million for the three months ended December 31, 2024 and 2023, respectively. These sales are not material to our consolidated financial results and are not included in the following operating segment financial data.

Salt Results


	QTD 2024		QTD 2023
Salt Sales (in millions)	$	242.2	$	274.3
Salt Operating Earnings (in millions)	$	29.4	$	50.9
Salt Sales Volumes (thousands of tons)
Highway deicing	1,987		2,266
Consumer and industrial	506		589
Total tons sold	2,493		2,855
Average Salt Sales Price (per ton)
Highway deicing	$	69.50	$	70.36
Consumer and industrial	$	205.74	$	194.94
Combined	$	97.16	$	96.08

Commentary: Three Months Ended December 31, 2024 Compared to Three Months Ended December 31, 2023

•Salt sales decreased $32.1 million, or 12%, primarily due to lower sales volumes, which was partially offset by higher average sales prices for our consumer and industrial products.

•Salt sales volumes decreased 13% in total, or 362,000 tons, reducing sales by approximately $35.9 million. Highway deicing sales volumes decreased 12%, reflecting a decrease in deicing sales volumes in both the highway and consumer and industrial products. Consumer and industrial sales volumes decreased 14% primarily due to lower non-deicing volumes.

•Average sales prices increased 1% partially offsetting the volume decline by approximately $3.8 million with increases in consumer and industrial average sales prices.

•Highway deicing average sales price decreased 1% across all product categories. Consumer and industrial average sales price increased 6% due to price increases taken to offset inflation realized in prior years. The higher average sales prices are also reflective of sales mix.

•Salt operating earnings decreased 42%, or $21.5 million, due primarily to lower sales volumes and higher per-unit product costs, which were partially offset by slightly higher average sales prices.

Plant Nutrition Results


	QTD 2024		QTD 2023
Plant Nutrition Sales (in millions)	$	61.4	$	49.7
Plant Nutrition Operating Loss (in millions)	$	(3.1)	$	(2.3)
Plant Nutrition Sales Volumes (thousands of tons)	102		75
Plant Nutrition Average Sales Price (per ton)	$	603	$	660


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Commentary: Three Months Ended December 31, 2024 Compared to Three Months Ended December 31, 2023

•Plant Nutrition sales increased 24%, or $11.7 million, due to higher sales volumes, which were partially offset by lower average sales prices.

•Plant Nutrition sales volumes increased 36% year over year driven by a return to more normalized sales volumes following a year in which customers delayed or reduced purchases. The higher sales volumes increased sales by approximately $17.5 million.

•Plant Nutrition average sales prices decreased 9%, which contributed approximately $5.8 million to the decrease in sales. Average sales prices decreased throughout fiscal 2024 and into 2025 due to global supply and demand dynamics for fertilizer products resulting in weakening pricing versus the comparable prior year period.

•Plant Nutrition operating loss increased $0.8 million to $3.1 million primarily due to lower average sales prices, which was mostly offset by higher sales volumes and lower per-unit product costs.

Outlook

•Following one of weakest winters in our served markets in nearly a quarter century, committed volumes for fiscal year 2025 in the North American highway deicing business are down approximately 9%. Despite these lower volume commitments, we expect Salt segment sales volumes to increase by approximately 7% year over year at the mid-point of our guidance range based on a reversion to more normalized weather. Pricing for the Salt segment is expected to decline slightly year over year, driven by lower North American highway deicing bid season results that saw average pricing contract due to excess supply across the system. Accordingly, we expect Salt segment sales volumes and adjusted EBITDA to range from 9.4 million to 10.5 million tons and $205 million to $230 million, respectively, in fiscal year 2025.

•Plant Nutrition segment sales volumes are expected to improve to a range of 295,000 to 315,000 tons in fiscal year 2025, improving from levels in fiscal year 2024. We expect lower average selling prices throughout fiscal 2025 due to anticipated weakness in global potash prices. For fiscal year 2025, we expect adjusted EBITDA in a range of $17 million to $24 million.

•Fiscal year 2025 capital expenditures are expected to be in the $75 million to $85 million range.

Liquidity and Capital Resources

Historically, our cash flows from operating activities have generally been adequate to fund our basic operating requirements, ongoing debt service and sustaining investment in our property, plant and equipment. We have also used cash generated from operations to fund capital expenditures, pay dividends, fund smaller acquisitions and repay our debt. To a certain extent, our ability to meet our short- and long-term liquidity and capital needs is subject to general economic, financial, competitive and weather conditions, effects of climate change, geological variations in our mine deposits and other factors that are beyond our control. Historically, our working capital requirements have been the highest in the first fiscal quarter (ending December 31) and lowest in the third fiscal quarter (ending June 30). When needed, we may fund short-term working capital requirements by accessing our $325 million revolving credit facility and our $100.0 million revolving AR Securitization Facility. As of December 31, 2024, we had liquidity of approximately $126.3 million, comprised of $45.8 million of cash and cash equivalents and $80.5 million of availability under our $325 million revolving credit facility.

We have been able to manage our cash flows generated and used across Compass Minerals to indefinitely reinvest earnings in our foreign jurisdictions or efficiently repatriate those funds to the U.S. As of December 31, 2024, we had $16.4 million of cash and cash equivalents that was either held directly or indirectly by foreign subsidiaries. In fiscal 2024 we did not repatriate any unremitted foreign earnings. It is our current intention to continue to reinvest undistributed earnings of our foreign subsidiaries indefinitely. We review our tax circumstances on a regular basis with the intent of optimizing cash accessibility and minimizing tax expense.

In addition, the amount of permanently reinvested earnings is influenced by, among other things, the profits generated by our foreign subsidiaries and the amount of investment in those same subsidiaries. The profits generated by our U.S. and foreign subsidiaries are impacted by the transfer price charged on the transfer of our products between them. Canadian provincial taxing authorities continue to challenge our transfer prices of certain items. The final resolution of these challenges may not occur for several years. We currently expect the outcome of these matters will not have a material impact on our results of operations. However, it is possible the resolution could materially impact the amount of earnings attributable to our foreign subsidiaries, which could impact the amount of permanently reinvested foreign earnings. See Item 1, Note 6 of our Consolidated Financial Statements for a discussion regarding our Canadian tax reassessments.


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Management assesses the available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit use of the existing deferred tax assets. A significant piece of objective negative evidence evaluated was the cumulative loss incurred in the U.S. over the three-year period ended December 31, 2024. Such objective evidence limits the ability to consider other subjective evidence, such as our projections for future income. On the basis of this evaluation, during the three months ended December 31, 2024, an additional valuation allowance of $9.5 million has been recorded to recognize only the portion of the U.S. deferred tax assets that are more likely than not to be realized. The amount of the deferred tax assets considered realizable, however, could be adjusted if estimates of future taxable income during the carryforward period are increased or reduced or if objective negative evidence in the form of cumulative losses is no longer present and additional weight is given to subjective evidence such as our projections for income.

Indebtedness

As of December 31, 2024, we had $980.3 million of outstanding indebtedness, consisting of $500.0 million outstanding under our 6.75% Senior Notes due 2027, $422.1 million of borrowings outstanding under our senior secured credit facilities under the Credit Agreement, consisting of $192.5 million of term loans and $229.6 million borrowed against our revolving credit facility, and $58.2 million of outstanding loans under the accounts receivable financing facility (see Item 1, Note 7 of our Consolidated Financial Statements for more detail regarding our debt). Outstanding letters of credit totaling $14.9 million as of December 31, 2024 further reduced available borrowing capacity under our revolving credit facility to $80.5 million.

We may borrow amounts under the revolving credit facility or enter into additional financing to fund our working capital requirements, potential acquisitions and capital expenditures and for other general corporate purposes.

Our ability to make scheduled interest and principal payments on our indebtedness, to modify our indebtedness, to fund planned capital expenditures and to fund acquisitions will depend on our ability to generate cash in the future. This, to a certain extent, is subject to general economic, financial, competitive, legislative, climate-related, regulatory and other factors that are beyond our control. Based on our current level of operations, we believe that cash flow from operations and available cash, together with available borrowings under our revolving credit facility, will be adequate to meet our liquidity needs over the next 12 months.

Our debt service obligations could, under certain circumstances, materially affect our financial condition and prevent us from fulfilling our debt obligations. As a holding company, CMI’s investments in its operating subsidiaries constitute substantially all of its assets. Consequently, our subsidiaries conduct substantially all of our consolidated operating activities and own substantially all of our operating assets. The principal source of the cash needed to pay our obligations is the cash generated from our subsidiaries’ operations and their borrowings. Furthermore, we must remain in compliance with the terms of the 2023 Credit Agreement governing our credit facilities, including the consolidated total net leverage ratio and interest coverage ratio, in order to pay dividends to our stockholders. We must also comply with the terms of our indenture governing our 6.75% Senior Notes due December 2027, which limit the amount of dividends we can pay to our stockholders.

On December 12, 2024, we entered into an amendment to our 2023 Credit Agreement, which, among other things, eased the restrictions of certain covenants contained in the agreement. The amendment included increasing the maximum allowed consolidated total net leverage ratio (as defined and calculated under the terms of the amended 2023 Credit Agreement) to 6.5x as of the last day of any quarter through the fiscal quarter ended September 30, 2025, then gradually stepping down to 4.50x for the fiscal quarter ended December 31, 2026 and thereafter. The amendment also decreased the Revolving Commitments (as defined in the Existing Credit Agreement) from $375 million to $325 million with additional reductions stepping down to $250 million on July 1, 2026. In connection with this amendment, we paid fees totaling $2.0 million which were capitalized as deferred financing costs. Additional arrangement and legal fees of $1.0 million were expensed as of December 31, 2024. As of December 31, 2024, our consolidated total net leverage ratio was approximately 5.9x.

Although we are in compliance with our debt covenants as of December 31, 2024, we can make no assurance that we will remain in compliance with these ratios. Furthermore, we may need to modify all or a portion of our indebtedness on or before maturity; however, we cannot provide assurance that we will be able to modify any of our indebtedness on commercially reasonable terms or at all.

Capital Allocation

Principally due to the nature of our deicing business, our cash flows from operations have historically been seasonal, with the majority of our cash flows from operations generated during the first half of the calendar year. When we have not been able to meet our short-term liquidity or capital needs with cash from operations, whether as a result of the seasonality of our business or other causes, we have met those needs with borrowings under our revolving credit facility. We expect to meet the ongoing


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requirements for debt service, any declared dividends and capital expenditures from these sources. This, to a certain extent, is subject to general economic, financial, competitive, legislative, regulatory and other factors that are beyond our control.

We manage our capital allocation considering our long-term strategic objectives, required spending to sustain our business and focus on generating adequate returns on capital. On April 22, 2024, our Board of Directors determined not to declare dividends for the foreseeable future in order to align our capital allocation policy with our corporate focus on accelerating cash flow generation and debt reduction. While our equipment and facilities are generally not impacted by rapid technology changes, our operations require refurbishments and replacements to maintain structural integrity and reliable production and shipping capabilities. When possible, we incorporate efficiency, environmental and safety improvement capabilities into our routine capital projects and we plan the timing of larger projects to balance with our liquidity and capital resources. Changes in our operating cash flows may affect our future capital allocation and spending.

The table below provides a summary of our cash flows by category:


THREE MONTHS ENDED DECEMBER 31, 2024			THREE MONTHS ENDED DECEMBER 31, 2023
Operating Activities:
Net cash used in operating activities were $4.1 million			Net cash used in operating activities were $52.3 million
» Net loss was $23.6 million.			» Net loss was $75.3 million.
» Non-cash depreciation and amortization expense was $26.8 million.			» Non-cash depreciation and amortization expense was $25.5 million.
» Non-cash stock-based compensation expense was $3.9 million.			» Non-cash stock-based compensation expense was $11.9 million.
» Unrealized foreign exchange gain of $5.7 million.			» Non-cash loss on impairments was $74.8 million.
» Working capital items were a use of operating cash flows of $8.1 million.			» Working capital items were a use of operating cash flows of $93.6 million.
Investing Activities:
Net cash flows used in investing activities were $22.2 million.			Net cash flows used in investing activities were $49.3 million.
» Net cash flows used in investing activities included $21.8 million of capital expenditures.			» Net cash flows used in investing activities included $48.6 million of capital expenditures.
Financing Activities:
Net cash flows provided by financing activities were $53.1 million.			Net cash flows provided by financing activities were $100.9 million.
» Included net proceeds from the issuance of debt of $57.5 million.			» Included net borrowings on our debt of $108.1 million.
» Included the payment of deferred financing costs of $2.4 million.			» Included the payment of dividends of $6.4 million.

As mentioned above, our Salt segment’s business is seasonal and our Salt segment results and working capital needs are heavily impacted by the severity and timing of the winter weather, which generally occurs from December through March of each year. Customers tend to replenish their inventory prior to the start of the winter season and following snow events; consequently, the number and timing of snow events during the winter season will impact the amount of our accounts receivable and inventory at the end of each quarter. Our operating cash flows for the three months ended December 31, 2024, reflect the seasonal increase in accounts receivable and accounts payable and decrease in inventories due to the beginning of the winter season. Our operating cash flows during the three months ended December 31, 2023, reflect the seasonal increase in accounts receivable due to the beginning of the winter season. During the first quarter of fiscal 2024, we also paid liabilities accrued as of September 30, 2023, including the remaining $10 million settlement payment to the SEC, accrued incentive compensation, interest on our debt, income taxes and other liabilities. Additionally, at the end of Fortress’ contract term with the USFS, we recognized revenue previously deferred in accrued liabilities.

Product Recall

On October 25, 2024, we issued a recall for nine production lots of food-grade salt produced at our Goderich Plant following a customer report of a non-organic, foreign material in its product. The products recalled included both products sold prior and subsequent to September 30, 2024. We followed recall protocol and notified our BRCGS Global Standard for Food Safety certifying body, the Canadian Food Inspection Agency (“CFIA”) and the U.S. Food and Drug Administration (“FDA”). We have been working to obtain and assess the reported foreign material, complete the necessary investigation, and determine the next steps. For the three months ended December 31, 2024, we recognized $0.9 million for costs related to the recall on the


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Consolidated Statements of Operations, a portion of which we believe is reimbursable by insurance. Additionally, as of December 31, 2024, we have recorded reserves of $35.0 million and estimated insurance recoveries of $35.0 million in our Consolidated Balance Sheets associated with customer claims.

We continue to assess the scope and magnitude of additional customer claims. At this time, based on currently available information and our applicable insurance coverage, we do not believe any incremental losses will have a material adverse effect on our results of operations or cash flows in future periods.

Other Matters

See Item 1, Notes 6 and 8 of our Consolidated Financial Statements for a discussion regarding labor, environmental and litigation matters.

Reconciliation of Net Earnings (Loss) from Continuing Operations to EBITDA and Adjusted EBITDA

Management uses a variety of measures to evaluate our performance. While our consolidated financial statements, taken as a whole, provide an understanding of our overall results of operations, financial condition and cash flows, we analyze components of the consolidated financial statements to identify certain trends and evaluate specific performance areas. In addition to using U.S. GAAP financial measures, such as gross profit, net earnings and cash flows generated by operating activities, management uses EBITDA and Adjusted EBITDA. Both EBITDA and Adjusted EBITDA are non-GAAP financial measures used to evaluate the operating performance of our core business operations because our resource allocation, financing methods, cost of capital and income tax positions are managed at a corporate level, apart from the activities of the operating segments, and our operating facilities are located in different taxing jurisdictions, which can cause considerable variation in net earnings. We also use EBITDA and Adjusted EBITDA to assess our operating performance and return on capital against other companies, and to evaluate potential acquisitions or other capital projects. EBITDA and Adjusted EBITDA are not calculated under U.S. GAAP and should not be considered in isolation or as a substitute for net earnings, cash flows or other financial data prepared in accordance with U.S. GAAP or as a measure of our overall profitability or liquidity.

EBITDA and Adjusted EBITDA exclude interest expense, income taxes and depreciation and amortization, each of which are an essential element of our cost structure and cannot be eliminated. Furthermore, Adjusted EBITDA excludes other cash and non-cash items, including stock-based compensation, interest income, (gain) loss on foreign exchange, other (income) expense, net and other significant items that management does not consider indicative of normal operations. Other significant items, such as executive transition costs, restructuring charges and impairment charges involve distinct initiatives that are not reflective of core operating activities and affect the comparability of our operational results across reporting periods. Our borrowings are a significant component of our capital structure and interest expense is a continuing cost of debt. We are also required to pay income taxes, a required and ongoing consequence of our operations. We have a significant investment in capital assets and depreciation and amortization reflect the utilization of those assets in order to generate revenues. Our employees are vital to our operations and we utilize various stock-based awards to compensate and incentivize our employees. Consequently, any measure that excludes these elements has material limitations. While EBITDA and Adjusted EBITDA are frequently used as measures of operating performance, these terms are not necessarily comparable to similarly titled measures of other companies due to the potential inconsistencies in the method of calculation.


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The calculation of EBITDA and Adjusted EBITDA as used by management is set forth in the table below (in millions):


	Three Months Ended December 31,
	2024		2023
Net loss	$	(23.6)	$	(75.3)
Interest expense	16.9		15.9
Income tax expense	9.7		3.6
Depreciation, depletion and amortization	26.8		25.5
EBITDA	29.8		(30.3)
Adjustments to EBITDA:
Stock-based compensation - non-cash	3.9		11.9
Interest income	(0.4)		(0.4)
(Gain) loss on foreign exchange	(5.2)		1.9


Product recall costs(a)	0.9		—
Restructuring charges(b)	—		3.6
Loss on impairments(b)	—		74.8

Other expense, net	3.1		0.7
Adjusted EBITDA	$	32.1	$	62.2

(a)We recognized costs related to a recall for food-grade salt produced at our Goderich Plant. Refer to Item 1, Note 8 for additional details.

(b)As a result of the decision to cease the pursuit of the lithium development, we recognized severance of $2.5 million related to the termination of the lithium development and $1.1 million related to other restructuring. We also recognized an impairment of lithium long-lived assets, which were determined to be no longer probable of recovery.

Recent Accounting Pronouncements

See Part 1, Note 1 of our Consolidated Financial Statements for a discussion of recent accounting pronouncements.

Effects of Currency Fluctuations and Inflation

Our operations outside of the U.S. are conducted primarily in Canada and the U.K. Therefore, our results of operations are subject to both currency transaction risk and currency translation risk. We incur currency transaction risk whenever we or one of our subsidiaries enters into either a purchase or sales transaction using a currency other than the local currency of the transacting entity. With respect to currency translation risk, our financial condition and results of operations are measured and recorded in the relevant local currency and then translated into U.S. dollars for inclusion in our historical consolidated financial statements. Exchange rates between these currencies and the U.S. dollar have fluctuated significantly from time to time and may do so in the future. The majority of revenues and costs are denominated in U.S. dollars, with Canadian dollars and British pounds sterling also being significant. Significant changes in the value of the Canadian dollar or British pound sterling relative to the U.S. dollar could have a material adverse effect on our financial condition and our ability to meet interest and principal payments on U.S. dollar-denominated debt, including borrowings under our senior secured credit facilities.

Although inflation has not had a significant impact on our operations in the current period, our efforts to recover inflation-based cost increases from our customers may be hampered as a result of the structure of our contracts and the contract bidding process as well as the competitive industries, economic conditions and countries in which we operate. For more information, see Part I, Item 1A, “Risk Factors” in our 2024 Form 10-K.

Seasonality

We experience a substantial amount of seasonality in our sales, including our salt deicing product sales. Consequently, our Salt segment sales and operating income are generally higher in the first and second fiscal quarters (ending December 31 and March 31) and lower during the third and fourth fiscal quarters of each year (ending June 30 and September 30). In particular, sales of highway and consumer deicing salt and magnesium chloride products vary based on the severity of the winter conditions in areas where the product is used. Following industry practice in North America and the U.K., we seek to stockpile sufficient quantities of deicing salt throughout the first, third and fourth fiscal quarters (ending December 31, June 30 and September 30) to meet the estimated requirements for the winter season. Our Plant Nutrition business is also seasonal. As a result, we and our


Table of Contents						COMPASS MINERALS INTERNATIONAL, INC.

customers generally build inventories during the Plant Nutrition business’ low demand periods of the year (which are typically winter and summer, but can vary due to weather and other factors) to ensure timely product availability during the peak sales seasons (which are typically spring and autumn, but can also vary due to weather and other factors). Lastly, any expected results of our fire retardant business are also seasonal with peak demand for fire retardant products and services occurring from June through September.

Climate Change

The potential impact of climate change on our operations, product demand and the needs of our customers remains uncertain. Significant changes to weather patterns, a reduction in average snowfall or regional drought within our served markets or at our Ogden facility could negatively impact customer demand for our products and our costs, as well as our ability to produce our products. For example, prolonged periods of mild winter weather could reduce the demand for our deicing products. Drought or excessive precipitation could similarly impact demand for our SOP products, as well as continue to impact the amount and quality of feedstock used to produce SOP at our Ogden facility due to changes in brine levels, mineral concentrations or other factors, which could have a material impact on our Plant Nutrition results of operations. Climate change could also lead to disruptions in the production or distribution of our products due to major storm events or prolonged adverse conditions, changing temperature levels, lake level fluctuations or flooding from sea level changes. Climate change or governmental initiatives to address climate change may affect our operations and necessitate capital expenditures in the future, although capital expenditures for climate-related projects are not expected to be material in fiscal 2025. For more information, see Part I, Item 1A, “Risk Factors” and Part I, Item 1 “Business—Environmental, Health and Safety and Other Regulatory Matters” in our 2024 Form 10-K.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Our business is subject to various types of market risks that include interest rate risk, foreign currency exchange rate risk and commodity pricing risk. Management has taken actions to mitigate our exposure to commodity pricing and foreign currency exchange rate risk by entering into natural gas derivative instruments and foreign currency contracts. We may take further actions to mitigate our exposure to interest rates, exchange rates and changes in the cost of fuel consumed at our production locations or the cost of transporting our products due to variations in our contracted carriers’ cost of fuel, which is typically diesel fuel. However, there can be no assurance that our hedging activities will eliminate or substantially reduce these risks. We do not enter into any financial instrument arrangements for speculative purposes. Our market risk exposure related to these items has not changed materially since September 30, 2024.

Item 4. Controls and Procedures

Disclosure Controls and Procedures

Our Chief Executive Officer and Chief Financial Officer have conducted an evaluation of the effectiveness of the design and operation of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934) as amended (the Exchange Act) under the supervision and with the participation of the Company’s management. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that as a result of the material weaknesses in internal control over financial reporting as described below, the Company’s disclosure controls and procedures were ineffective as of December 31, 2024.

Per Rules 13a-15(e) and 15d-15(e), the term disclosure controls and procedures means controls and other procedures of an issuer that are designed to ensure that information required to be disclosed by the issuer in the reports that it files or submits under the Exchange Act (15 U.S.C. 78a et seq.) is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by an issuer in the reports that it files or submits under the Exchange Act is accumulated and communicated to the issuer’s management, including its Chief Executive Officer and Chief Financial Officer, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

Our management, including our Chief Executive Officer and Chief Financial officer, does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent all errors and all fraud due to inherent limitations of internal controls. Because of such limitations, there is a risk that material misstatements will not be prevented or detected on a timely basis by internal control over financial reporting. However, these inherent limitations are known features of the financial reporting process. Therefore, it is possible to design into the process safeguards to reduce, though not eliminate, this risk.


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In light of the material weaknesses described below, management performed additional analysis and other procedures to ensure that our consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (GAAP). Accordingly, our Chief Executive Officer and Chief Financial Officer have concluded that the Company’s Consolidated Financial Statements included in this Form 10-Q present fairly, in all material respects, our financial position, results of operations and cash flows for the periods presented in conformity with U.S. GAAP.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

A material weakness, as defined in Rule 12b-2 under the Exchange Act, is a deficiency, or combination of control deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the Company’s annual or interim consolidated financial statements will not be prevented or detected on a timely basis.

As disclosed in our Annual Report on Form 10-K for the fiscal year ended September 30, 2024, we previously identified material weaknesses in our internal control over financial reporting. The Company, due to a limited allocation of trained, knowledgeable resources, did not conduct an effective risk assessment process to identify and evaluate at a sufficient level of detail all relevant risks of material misstatement, including fraud risks associated with the necessary approval of transactions. Additionally, the Company did not have an effective information and communication process that identified and assessed the source of and controls necessary to ensure the reliability of information used in financial reporting and that ensured complete, reliable information was made available to financial reporting personnel on a timely basis to fulfill their roles and responsibilities. As a consequence of the material weaknesses described above, internal control deficiencies related to the design and operation of process-level controls were determined to be ineffective throughout the Company’s financial reporting processes.

Remediation Efforts and Status of Material Weakness

The material weaknesses identified as of September 30, 2024, noted above were not remediated and the Company determined there were inadequate controls in place to conduct an effective risk assessment process or to effectively identify and assess the controls necessary to ensure reliable information used in financial reporting.

Management is in the process of developing a remediation plan to address the material weaknesses discussed above, including the development and implementation of processes and controls over financial reporting. Remediation will not occur until the plan is implemented, the applicable controls have operated for a sufficient period of time and management has concluded, through testing, that the controls are designed and operating effectively.

We will monitor the effectiveness of our remediation measures in connection with our future assessments of the effectiveness of internal control over financial reporting and disclosure controls and procedures, and we will make any changes to the design of our plan and take such other actions that we deem appropriate given the circumstances.

Changes in Internal Control Over Financial Reporting

Other than the remediation efforts noted above, there were no changes in the Company’s internal control over financial reporting during the most recently completed fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.


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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

We are involved in the legal proceedings described in Part I, Item 1, Note 6 and Part I, Item 1, Note 8 of our Consolidated Financial Statements and, from time to time, various routine legal proceedings and claims arising from the ordinary course of our business. These primarily involve tax assessments, disputes with former employees and contract labor, commercial claims, product liability claims, personal injury claims and workers’ compensation claims. Management cannot predict the outcome of legal proceedings and claims with certainty. Nevertheless, management believes that the outcome of legal proceedings and claims, which are pending or known to be threatened, even if determined adversely, will not, either individually or in the aggregate, have a material adverse effect on our results of operations, cash flows or financial condition, except as otherwise described in Part I, Item 1, Note 6 and Part I, Item 1, Note 8 of our Consolidated Financial Statements. There have been no material developments since September 30, 2024 with respect to our legal proceedings, except as described in Part I, Item 1, Note 6 and Part I, Item 1, Note 8 of our Consolidated Financial Statements.

Item 1A. Risk Factors

For a discussion of the risk factors applicable to Compass Minerals, please refer to Part I, Item 1A, “Risk Factors” in our Annual Report on Form 10-K for the annual period ended September 30, 2024.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(a)None.

(b)None.

(c)None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K is included in Exhibit 95 to this Quarterly Report on Form 10-Q.

Item 5. Other Information

Rule 10b5-1 Trading Plans

During the three months ended December 31, 2024, none of our directors or officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted or terminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act or any “non-Rule 10b5-1 trading arrangement” as defined in Item 408(c) of Regulation S-K.


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Item 6. Exhibits


Exhibit No.						Exhibit Description


31.1*						Section 302 Certifications of Edward C. Dowling, Jr., President and Chief Executive Officer.
31.2*						Section 302 Certifications of Peter Fjellman, Chief Financial Officer.
32**						Certification Pursuant to 18 U.S.C. §1350 of Edward C. Dowling, Jr., President and Chief Executive Officer, and Peter Fjellman, Chief Financial Officer.
95*						Mine Safety Disclosures.
101**						The following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarter ended December 31, 2024, formatted in Inline Extensible Business Reporting Language (iXBRL): (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Operations, (iii) Consolidated Statements of Comprehensive Loss, (iv) Consolidated Statements of Stockholders’ Equity, (v) Consolidated Statements of Cash Flows, and (vi) the Notes to the Consolidated Financial Statements.
104						Cover Page Interactive Data File (contained in Exhibit 101).
* Filed herewith
** Furnished herewith


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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.


	COMPASS MINERALS INTERNATIONAL, INC.

Date: February 10, 2025	By:	/s/ Peter Fjellman
		Peter Fjellman
		Chief Financial Officer
		(Principal Financial Officer)

Exhibit 31.1

CERTIFICATION

I, Edward C. Dowling, Jr., certify that:

1.I have reviewed this quarterly report on Form 10-Q of Compass Minerals International, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.


Date: February 10, 2025	By:	/s/ Edward C. Dowling, Jr.
		Edward C. Dowling, Jr.
		President and Chief Executive Officer

Exhibit 31.2

CERTIFICATION

I, Peter Fjellman, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Compass Minerals International, Inc.;

(b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.


Date: February 10, 2025	By:	/s/ Peter Fjellman
		Peter Fjellman
		Chief Financial Officer

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. §1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Each of the undersigned hereby certifies that this quarterly report on Form 10-Q for the period ended December 31, 2024, as filed with the Securities and Exchange Commission on the date hereof, based on my knowledge, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in this report fairly presents, in all material respects, the financial condition and results of operations of Compass Minerals International, Inc.



Date: February 10, 2025	By:	/s/ Edward C. Dowling, Jr.
		Edward C. Dowling, Jr.
		President and Chief Executive Officer
		(Principal Executive Officer)

Date: February 10, 2025	By:	/s/ Peter Fjellman
		Peter Fjellman
		Chief Financial Officer
		(Principal Financial Officer)

Exhibit 95

MINE SAFETY DISCLOSURE

We understand that to prevent employee and contractor injuries, we must approach safety excellence from many directions at once. We utilize a multi-faceted approach towards world class safety performance. This approach includes (1) setting a high standard of risk mitigation, (2) having robust safety management systems, and (3) supporting a culture of full engagement and personal accountability at all levels of the organization.

We continuously monitor our safety performance by assessing injury and non-injury incidents (e.g., near misses/near hits) as well as key performance indicators. We believe our approach to safety excellence will help us deliver on our commitment to our employees, contractors, their families and our customers to provide a safe working environment.

Mine Safety Data

A subsidiary of Compass Minerals International, Inc. owns and operates the Cote Blanche mine, an underground salt mine located in St. Mary Parish, Louisiana. The Cote Blanche mine is subject to regulation by the Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977, as amended (the “Mine Act”).

MSHA is required to regularly inspect the Cote Blanche mine and issue a citation, or take other enforcement action, if an inspector or authorized representative believes that a violation of the Mine Act or MSHA’s standards or regulations has occurred. MSHA is required to propose a civil penalty for each alleged violation that it cites.

We have the option to legally contest any enforcement action or related penalty we receive. As a result of this process, an enforcement action may be modified or vacated and any civil penalty proposed by MSHA for an alleged violation may be increased, reduced or eliminated. However, under the Mine Act, we are required to abate (or correct) each alleged violation within a specified time period, regardless of whether we contest the alleged violation.

The table below sets forth information for the quarterly period ended December 31, 2024 concerning certain mine safety violations and other regulatory matters pursuant to requirements under the Dodd-Frank Wall Street Reform and Consumer Protection Act and Securities and Exchange Commission rules and regulations. The information only applies to our operations regulated by the U.S. Mine Safety and Health Administration.


Mine Name/ Mine I.D. Number	Section 104 S&S Citations & Orders1	Section 104(b) Orders2	Section 104(d) Citations & Orders3	Section 110(b)(2) Violations4	Section 107(a) Orders5	Total Dollar Value of MSHA Proposed Assessments (Actual Amount)	Total Number of Mining Related Fatalities	Received Notice of Pattern of Violations under Section 104(e) (Yes/No)6	Legal Actions Pending as of Last Day of Period7	Legal Actions Initiated During Period8	Legal Actions Resolved During Period
Cote Blanche Mine/16-00358	13	0	0	0	0	$49,028	0	No	1	1	1

1 Represents the number of citations and orders issued under Section 104 of the Mine Act for alleged violations of mandatory health or safety standards that could significantly and substantially contribute to a mine health and safety hazard. The number reported includes no orders alleging an S&S violation issued under Section 104(g) of the Mine Act.

2 Represents the number of orders issued under Section 104(b) of the Mine Act for alleged failures to abate a citation issued under Section 104(a) of the Mine Act within the time period specified in the citation.

3 Represents the number of citations and orders issued under Section 104(d) of the Mine Act for alleged unwarrantable failures (aggravated conduct constituting more than ordinary negligence) to comply with mandatory safety or health standards.

4 Represents the number of violations issued under section 110(b)(2) of the Mine Act for alleged “flagrant” failures (reckless or repeated failures) to make reasonable efforts to eliminate a known violation of a mandatory safety or health standard that substantially proximately caused, or reasonably could have been expected to cause, death or serious bodily injury.

5 Represents the number of orders issued under Section 107(a) of the Mine Act for alleged conditions or practices which could reasonably be expected to cause death or serious physical harm before the condition or practice can be abated.

6 Section 104(e) written notices are issued for an alleged pattern of violating mandatory health or safety standards that could significantly and substantially contribute to a mine safety or health hazard.

7 Represents one civil penalty proceeding involving the contest of Citation Nos. 9743252, 9743253, 9743254 and 9743258.

8 Represents one civil penalty proceeding involving the contest of Citation Nos. 9792713, 9792714, 9792715 and 9792716.

Cover Page - shares	3 Months Ended
Cover Page - shares	Dec. 31, 2024	Feb. 05, 2025
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2024
Document Transition Report	false
Entity File Number	001-31921
Entity Registrant Name	Compass Minerals International, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3972986
Entity Address, Address Line One	9900 West 109th Street
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Overland Park
Entity Address, State or Province	KS
Entity Address, Postal Zip Code	66210
City Area Code	913
Local Phone Number	344-9200
Title of 12(b) Security	Common stock, $0.01 par value
Trading Symbol	CMP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		41,504,100
Entity Central Index Key	0001227654
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Current assets:
Cash and cash equivalents	$ 45.8	$ 20.2
Receivables, less allowance for doubtful accounts of $3.1 and $3.6 at December 31, 2024 and September 30, 2024, respectively	261.7	126.1
Inventories, less allowance of $14.5 and $11.4 at December 31, 2024 and September 30, 2024, respectively	367.1	414.1
Other current assets	23.0	26.9
Total current assets	697.6	587.3
Property, plant and equipment, net	778.6	806.5
Intangible assets, net	80.1	82.5
Goodwill	5.8	6.0
Other noncurrent assets	158.8	157.8
Total assets	1,720.9	1,640.1
Current liabilities:
Current portion of long-term debt	8.7	7.5
Accounts payable	96.2	82.1
Accrued salaries and wages	15.5	22.6
Income taxes payable	6.0	13.1
Accrued interest	6.0	13.3
Accrued expenses and other current liabilities	162.4	78.4
Total current liabilities	294.8	217.0
Long-term debt, net of current portion	965.7	910.0
Deferred income taxes, net	56.0	56.5
Other noncurrent liabilities	141.4	140.0
Commitments and contingencies (Note 8)
Stockholders’ equity:
Common stock: $0.01 par value, 200,000,000 authorized shares; 42,197,964 issued shares at December 31, 2024 and September 30, 2024	0.4	0.4
Additional paid-in capital	424.3	420.6
Treasury stock, at cost — 732,721 shares at December 31, 2024 and 816,013 shares at September 30, 2024	(10.4)	(10.2)
Retained (loss) earnings	(21.4)	2.2
Accumulated other comprehensive loss	(129.9)	(96.4)
Total stockholders’ equity	263.0	316.6
Total liabilities and stockholders’ equity	$ 1,720.9	$ 1,640.1

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
ASSETS
Allowance for doubtful accounts	$ 3.1	$ 3.6
Inventory Valuation Reserves	$ 14.5	$ 11.4
Stockholders’ equity:
Common stock, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	42,197,964	42,197,964
Treasury stock, shares (in shares)	732,721	816,013

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Sales	$ 307.2	$ 341.7
Gross profit	34.3	71.1
Selling, general and administrative expenses	33.3	45.7
Loss on impairments	0.0	74.8
Other operating expense	0.5	4.2
Operating earnings (loss)	0.5	(53.6)
Other (income) expense:
Interest income	(0.4)	(0.4)
Interest expense	16.9	15.9
(Gain) loss on foreign exchange	(5.2)	1.9
Other expense, net	3.1	0.7
Loss before income taxes	(13.9)	(71.7)
Income tax expense	9.7	3.6
Net loss	$ (23.6)	$ (75.3)
Basic net (loss) earnings per common share (in dollars per share)	$ (0.57)	$ (1.83)
Diluted net (loss) earnings per common share (in dollars per share)	$ (0.57)	$ (1.83)
Weighted-average common shares outstanding (in thousands):
Basic (in shares)	41,441	41,205
Diluted (in shares)	41,441	41,205
Shipping and handling cost
Cost	$ 80.6	$ 91.3
Product cost
Cost	$ 192.3	$ 179.3

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (23.6)	$ (75.3)
Other comprehensive income (loss):
Unrealized gain from change in pension obligations, net of tax of $(0.1) for the three months ended December 31, 2024 and 2023, respectively	0.2	0.2
Unrealized loss from change in other postretirement benefits, net of tax of $0.0 for the three months ended December 31, 2024 and 2023	(0.1)	0.0
Unrealized loss on cash flow hedges, net of tax of $0.0 for the three months ended December 31, 2024 and 2023, respectively	(0.3)	(1.8)
Cumulative translation adjustment	(33.3)	14.6
Comprehensive loss	$ (57.1)	$ (62.3)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) from change in pension obligations, tax	$ (0.1)	$ (0.1)
Unrealized loss, other postretirement benefits, tax	0.0	0.0
Unrealized income (loss) on cash flow hedges, tax	$ 0.0	$ 0.0

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings (Loss)	Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2023	$ 521.0	$ 0.4	$ 413.1		$ 220.9	$ (104.7)
Beginning balance, treasury stock at Sep. 30, 2023				$ (8.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive loss	(62.3)				(75.3)	13.0
Dividends on common stock	(6.4)				(6.4)
Shares issued for stock units, net of shares withheld for taxes	(0.8)		(0.2)	(0.6)
Stock-based compensation	11.9		11.9
Ending balance at Dec. 31, 2023	463.4	0.4	424.8		139.2	(91.7)
Ending balance, treasury stock at Dec. 31, 2023				(9.3)
Beginning balance at Sep. 30, 2024	316.6	0.4	420.6		2.2	(96.4)
Beginning balance, treasury stock at Sep. 30, 2024	(10.2)			(10.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive loss	(57.1)				(23.6)	(33.5)
Shares issued for stock units, net of shares withheld for taxes	(0.4)		(0.2)	(0.2)
Stock-based compensation	3.9		3.9
Ending balance at Dec. 31, 2024	263.0	$ 0.4	$ 424.3		$ (21.4)	$ (129.9)
Ending balance, treasury stock at Dec. 31, 2024	$ (10.4)			$ (10.4)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)	3 Months Ended
	Dec. 31, 2023 $ / shares
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share)	$ 0.15

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net loss	$ (23.6)	$ (75.3)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Depreciation, depletion and amortization	26.8	25.5
Amortization of deferred financing costs	0.8	0.6
Stock-based compensation	3.9	11.9
Deferred income taxes	2.7	0.6
Unrealized foreign exchange (gain) loss	(5.7)	1.7
Loss on impairments	0.0	74.8
Other, net	(0.9)	1.5
Changes in operating assets and liabilities:
Receivables	(61.3)	(37.6)
Inventories	39.1	7.8
Other assets	(2.0)	4.0
Accounts payable and accrued expenses and other current liabilities	9.1	(65.4)
Other liabilities	7.0	(2.4)
Net cash used in operating activities	(4.1)	(52.3)
Cash flows from investing activities:
Capital expenditures	(21.8)	(48.6)
Other, net	(0.4)	(0.7)
Net cash used in investing activities	(22.2)	(49.3)
Cash flows from financing activities:
Proceeds from revolving credit facility borrowings	140.3	102.4
Principal payments on revolving credit facility borrowings	(100.8)	(31.5)
Proceeds from issuance of long-term debt	19.6	38.4
Principal payments on long-term debt	(1.6)	(1.2)
Dividends paid	0.0	(6.4)
Deferred financing costs	(2.4)	0.0
Shares withheld to satisfy employee tax obligations	(0.4)	(0.8)
Other, net	(1.6)	0.0
Net cash provided by financing activities	53.1	100.9
Effect of exchange rate changes on cash and cash equivalents	(1.2)	0.3
Net change in cash and cash equivalents	25.6	(0.4)
Cash and cash equivalents, beginning of the year	20.2	38.7
Cash and cash equivalents, end of period	45.8	38.3
Supplemental cash flow information:
Interest paid, net of amounts capitalized	23.4	23.6
Income taxes paid, net of refunds	8.0	12.8
Net change to property, plant and equipment through accounts payable and accrued expenses and other current liabilities	$ 9.0	$ 17.7

Accounting Policies and Basis of Presentation	3 Months Ended
Accounting Policies and Basis of Presentation	Dec. 31, 2024
Accounting Policies [Abstract]
Accounting Policies and Basis of Presentation	Accounting Policies and Basis of Presentation: Compass Minerals International, Inc. (“CMI”), through its subsidiaries (collectively, the “Company”), is a leading global provider of essential minerals focused on safely delivering where and when it matters to help solve nature’s challenges for customers and communities. The Company’s salt products help keep roadways safe during winter weather and are used in numerous other consumer, industrial, chemical and agricultural applications. Its plant nutrition business is the leading North American producer of sulfate of potash (“SOP”), which is used in the production of specialty fertilizers for high-value crops and turf and helps improve the quality and yield of crops, while supporting sustainable agriculture. The Company’s principal products are salt, consisting of sodium chloride and magnesium chloride, and SOP. The Company is also working to develop long-term fire-retardant solutions to help combat wildfires. The Company’s production sites are located in the United States (“U.S.”), Canada and the United Kingdom (“U.K.”). The Company also provides records management services in the U.K. Except where otherwise noted, references to North America include only the continental U.S. and Canada, and references to the U.K. include only England, Scotland and Wales. References to “Compass Minerals,” “our,” “us” and “we” refer to CMI and its consolidated subsidiaries. CMI is a holding company with no significant operations other than those of its wholly-owned subsidiaries. The consolidated financial statements include the accounts of CMI and its wholly-owned domestic and foreign subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete consolidated financial statements. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements of the Company for the annual period ended September 30, 2024, as filed with the Securities and Exchange Commission (the “SEC”) in its Annual Report on Form 10-K on December 16, 2024 (“2024 Form 10-K”). In the opinion of management, all adjustments, consisting of normal recurring adjustments considered necessary for a fair presentation, have been included. The Company experiences a substantial amount of seasonality in its sales, including its salt deicing product sales. Consequently, Salt segment sales and operating income are generally higher in the first and second fiscal quarters (ending December 31 and March 31) and lower during the third and fourth fiscal quarters (ending June 30 and September 30). In particular, sales of highway and consumer deicing salt and magnesium chloride products vary based on the severity of the winter conditions in areas where the products are used. Following industry practice in North America and the U.K., the Company seeks to stockpile sufficient quantities of deicing salt throughout the first, third and fourth fiscal quarters (ending December 31, June 30 and September 30) to meet the estimated requirements for the winter season. Production of deicing salt can also vary based on the severity or mildness of the preceding winter season. Due to the seasonal nature of the deicing product lines, operating results for the interim periods are not necessarily indicative of the results that may be expected for the full fiscal year. The Company’s plant nutrition business is also seasonal. As a result, the Company and its customers generally build inventories during the plant nutrition business’ low demand periods of the year (which are typically winter and summer, but can vary due to weather and other factors) to ensure timely product availability during the peak sales seasons (which are typically spring and autumn, but can also vary due to weather and other factors). Lastly, any expected results of the Company’s fire retardant business are also seasonal with peak demand for fire retardant products and services occurring from June through September. The Company does not yet have a contract for fiscal 2025. Significant Accounting Policies The Company’s significant accounting policies are detailed in “Note 2 – Summary of Significant Accounting Policies” within Part II, Item 8 of its 2024 Form 10-K. There were no material changes in the Company’s significant accounting policies from those described in its 2024 Form 10-K. Recent Accounting Pronouncements In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures”, which updates reportable segment disclosure requirements primarily to include enhanced disclosures about significant segment expenses. The amendments are effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements. Management is currently evaluating this ASU to determine its impact on the Company's disclosures. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures”, which updates income tax disclosures by requiring consistent categories and additional disaggregation of information in the rate reconciliation and income taxes paid by jurisdiction. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied prospectively; however, retrospective application is permitted. Management is currently evaluating this ASU to determine its impact on the Company’s disclosures. In November 2024, the FASB issued amended guidance related to disclosure of disaggregated expenses (“ASU 2024-03”). This amendment requires public business entities to provide detailed disclosures in the notes to financial statements disaggregating specific expense categories, including employee compensation, depreciation, and intangible asset amortization, as well as certain other disclosures to provide enhanced transparency into the nature and function of expenses. This new guidance is effective for annual periods beginning in the Company’s fiscal 2028 and interim periods following annual adoption, with early adoption permitted. This guidance will be applied on a prospective basis with retrospective application permitted. Management is currently evaluating this ASU to determine its impact on the Company’s disclosures.

Revenues	3 Months Ended
Revenues	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenues	Revenues: Deferred Revenue Deferred revenue represents collections under non-cancellable contracts before the related product or service is transferred to the customer. The portion of deferred revenue that is anticipated to be recognized as revenue during the succeeding twelve-month period is recorded in accrued expenses and other current liabilities on the Consolidated Balance Sheets. Deferred revenue as of both December 31, 2024 and September 30, 2024 was approximately $3.6 million. See Note 9 for a disaggregation of sales by segment, type and geographical region.

Inventories

3 Months Ended

Dec. 31, 2024

Inventory Disclosure [Abstract]

Inventories

Inventories:

Inventories consist of the following (in millions):


	December 31, 2024		September 30, 2024
Finished goods	$	286.8	$	336.5
Work in process	6.4		6.4
Raw materials and supplies(a)	73.9		71.2
Total inventories	$	367.1	$	414.1

Property, Plant and Equipment, Net

3 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment, Net

Property, Plant and Equipment, Net:

Property, plant and equipment, net, consists of the following (in millions):


	December 31, 2024		September 30, 2024
Land, buildings and structures, and leasehold improvements	$	550.2	$	559.8
Machinery and equipment	1,120.2		1,149.5
Office furniture and equipment	23.9		24.1
Mineral interests	166.5		170.4
Construction in progress	57.5		56.0
	1,918.3		1,959.8
Less: accumulated depreciation and depletion	(1,139.7)		(1,153.3)
Property, plant and equipment, net	$	778.6	$	806.5

Goodwill and Intangible Assets

3 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets:

Changes in the carrying amount of goodwill are summarized as follows (in millions):


	Corporate & Other
Balance as of September 30, 2024	$	6.0
Foreign currency translation adjustment	(0.2)
Balance as of December 31, 2024	$	5.8

Income Taxes	3 Months Ended
Income Taxes	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes: The Company’s effective income tax rate differs from the U.S. statutory federal income tax rate primarily due to U.S. statutory depletion, state income taxes (net of federal tax benefit), nondeductible executive compensation over $1 million, foreign income, mining and withholding taxes, base erosion and anti-abuse tax, and valuation allowances recorded on deferred tax assets. The effective tax rates applied to the three months ended December 31, 2024 were determined by excluding the U.S. losses from the overall estimated annual effective tax rate computations and a separate estimated annual effective tax rate was computed and applied to the ordinary U.S. losses. Management assesses the available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit use of the existing deferred tax assets. A significant piece of objective negative evidence evaluated was the cumulative loss incurred in the U.S. over the three-year period ended December 31, 2024. Such objective evidence limits the ability to consider other subjective evidence, such as the Company’s projections for future income. On the basis of this evaluation, during the three months ended December 31, 2024, an additional valuation allowance of $9.5 million has been recorded to recognize only the portion of the U.S. deferred tax assets that is more likely than not to be realized. The amount of the deferred tax assets considered realizable, however, could be adjusted if objective negative evidence in the form of cumulative losses is no longer present and additional weight is given to subjective evidence such as the Company’s projections for income. As of December 31, 2024 and September 30, 2024, the Company had $78.4 million and $76.4 million, respectively of gross federal NOL carryforwards that have no expiration date and $6.6 million and $6.1 million at December 31, 2024 and September 30, 2024, respectively of net operating tax-effected state NOL carryforwards which expire beginning in 2031. Canadian provincial tax authorities have challenged tax positions claimed by one of the Company’s Canadian subsidiaries and have issued tax reassessments for fiscal years 2002-2019. The reassessments are a result of ongoing audits and total $192.8 million, including interest, through December 31, 2024. The Company disputes these reassessments and will continue to work with the appropriate authorities in Canada to resolve the dispute. There is a reasonable possibility that the ultimate resolution of this dispute, and any related disputes for other open tax years, may be materially higher or lower than the amounts the Company has reserved for such disputes. In connection with this dispute, local regulations require the Company to post security with the tax authority until the dispute is resolved. The Company has posted collateral in the form of a $152.3 million performance bond and has paid $34.6 million to the Canadian tax authorities (most of which is recorded in other assets in the Consolidated Balance Sheets at December 31, 2024, and September 30, 2024), which is necessary to proceed with future appeals or litigation. The Company expects that it will be required by local regulations to provide security for additional interest on the above unresolved disputed amounts and for any future reassessments issued by these Canadian tax authorities in the form of cash, letters of credit, performance bonds, asset liens or other arrangements agreeable with the tax authorities until the disputes are resolved. The Company expects that the ultimate outcome of these matters will not have a material impact on its results of operations or financial condition. However, the Company can provide no assurance as to the ultimate outcome of these matters, and the impact could be material if they are not resolved in the Company’s favor. As of December 31, 2024, the Company believes it has adequately reserved for these reassessments. Additionally, the Company has other uncertain tax positions as well as assessments and disputed positions with taxing authorities in its various jurisdictions, which are consistent with those matters disclosed in the Company’s 2024 Form 10-K.

Long-Term Debt

3 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Long-Term Debt

Long-Term Debt:

Long-term debt consists of the following (in millions):


	December 31, 2024		September 30, 2024
6.75% Senior Notes due December 2027	$	500.0	$	500.0
Term Loan due May 2028	192.5		193.8
Revolving Credit Facility due May 2028	229.6		190.1
AR Securitization Facility expires March 2027	58.2		38.9
	980.3		922.8
Less unamortized debt issuance costs	(5.9)		(5.3)
Total debt	974.4		917.5
Less current portion	(8.7)		(7.5)
Long-term debt	$	965.7	$	910.0

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies: On October 21, 2022, a putative securities class was filed in the United States District Court for the District of Kansas. The lawsuit alleges that the Company and certain former executives of the Company made misleading statements and that shareholders were damaged by these statements. Plaintiffs filed an Amended Complaint on March 13, 2023; the Company filed a Motion to Dismiss on May 12, 2023. On December 12, 2023, the court granted and denied in part the Company’s Motion to Dismiss. On December 29, 2023, the Company filed a request for an interlocutory appeal and a request for a stay of discovery. On March 15, 2024, the Court denied the Company’s request for an interlocutory appeal. The parties participated in a mediation on November 19, 2024; the parties did not resolve the matter at mediation. On February 7, 2024, the parties reached an agreement in principle to resolve the matter and filed a motion to stay discovery. The agreement is preliminary and subject to final documentation, preliminary court approval and final approval after a court hearing. At this time, based on currently available information and its applicable insurance coverage, the Company believes any settlement to be paid will be covered by insurance and does not believe any losses will have a material adverse effect on its results of operations or cash flows in future periods. Additionally, the Company has recorded an estimated liability and estimated insurance recoveries in its Consolidated Balance Sheets as of December 31, 2024. On February 1, 2023, a shareholder derivative lawsuit was filed in the District of Kansas by an individual shareholder, purportedly on behalf of the Company. The lawsuit alleges that certain directors and executives breached their fiduciary duties to shareholders by failing to prevent the dissemination of misstatements and omissions from October 30, 2017, to November 18, 2018. The parties have stipulated to stay this matter through the discovery stage of the putative securities class action. On October 30, 2024, an additional shareholder derivative lawsuit was filed in the District of Kansas by an individual shareholder, purportedly on behalf of the Company. The lawsuit alleges that certain directors and executives breached their fiduciary duties to shareholders by willfully or recklessly causing the Company to make false and/or misleading statements and/or omissions of material fact from October 31, 2017, to October 21, 2022. The Company is also involved in legal and administrative proceedings and claims of various types from the ordinary course of the Company’s business. Management cannot predict the outcome of legal claims and proceedings with certainty. Nevertheless, management believes that the outcome of legal proceedings and claims, which are pending or known to be threatened, even if determined adversely, will not, individually or in the aggregate, have a material adverse effect on the Company’s results of operations, cash flows or financial position, except as otherwise described in Note 6 and this Note 8. The Company also has contingent consideration liabilities related to the Fortress North America, LLC (“Fortress”) acquisition. Refer to Note 12 for additional information. On October 25, 2024, the Company issued a recall for nine production lots of food-grade salt produced at its Goderich Plant following a customer report of a non-organic, foreign material in its product. The products recalled included both products sold prior and subsequent to September 30, 2024. The Company followed recall protocol and notified its BRCGS Global Standard for Food Safety certifying body, the Canadian Food Inspection Agency (“CFIA”) and the U.S. Food and Drug Administration (“FDA”). The Company has been working to obtain and assess the reported foreign material, complete the necessary investigation, and determine the next steps. For the three months ended December 31, 2024, the Company recognized $0.9 million for costs related to the recall on the Consolidated Statements of Operations, a portion of which the Company believes is reimbursable by insurance. Additionally, as of December 31, 2024, the Company has recorded a liability of $35.0 million and estimated insurance recoveries of $35.0 million in its Consolidated Balance Sheets associated with customer claims. The Company continues to assess the scope and magnitude of additional customer claims. At this time, based on currently available information and its applicable insurance coverage, the Company does not believe any incremental losses will have a material adverse effect on its results of operations or cash flows in future periods.

Operating Segments

3 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Operating Segments

Operating Segments:

Segment information is as follows (in millions):


Three Months Ended December 31, 2024	Salt		Plant Nutrition		Corporate & Other(a)		Total
Sales to external customers	$	242.2	$	61.4	$	3.6	$	307.2
Intersegment sales	—		3.2		(3.2)		—
Shipping and handling cost	71.3		9.3		—		80.6
Operating earnings (loss)(b)	29.4		(3.1)		(25.8)		0.5
Depreciation, depletion and amortization	17.5		7.5		1.8		26.8
Total assets (as of end of period)	1,092.4		388.1		240.4		1,720.9


Three Months Ended December 31, 2023	Salt		Plant Nutrition		Corporate & Other(a)		Total
Sales to external customers	$	274.3	$	49.7	$	17.7	$	341.7
Intersegment sales	—		3.1		(3.1)		—
Shipping and handling cost	83.7		7.0		0.6		91.3
Operating earnings (loss)(b)(c)	50.9		(2.3)		(102.2)		(53.6)
Depreciation, depletion and amortization	15.2		8.4		1.9		25.5
Total assets (as of end of period)	1,056.6		469.7		278.9		1,805.2

Disaggregated revenue by product type is as follows (in millions):


Three Months Ended December 31, 2024	Salt		Plant Nutrition		Corporate & Other(a)		Total
Highway Deicing Salt	$	138.1	$	—	$	—	$	138.1
Consumer & Industrial Salt	104.1		—		—		104.1


SOP	—		64.6		—		64.6


Eliminations & Other	—		(3.2)		3.6		0.4
Sales to external customers	$	242.2	$	61.4	$	3.6	$	307.2


Three Months Ended December 31, 2023	Salt		Plant Nutrition		Corporate & Other(a)		Total
Highway Deicing Salt	$	159.4	$	—	$	—	$	159.4
Consumer & Industrial Salt	114.9		—		—		114.9


SOP	—		52.8		—		52.8
Fire Retardant	—		—		14.0		14.0
Revenue from Services	—		—		0.5		0.5
Eliminations & Other	—		(3.1)		3.2		0.1
Sales to external customers	$	274.3	$	49.7	$	17.7	$	341.7

The Company’s revenue by geographic area is as follows (in millions):


	Three Months Ended December 31,
Revenue	2024		2023
United States(a)	$	212.7	$	250.9
Canada	79.3		77.6
United Kingdom	11.2		13.0
Other	4.0		0.2
Total revenue	$	307.2	$	341.7

(a)United States sales exclude product sold to foreign customers at U.S. ports.

Stockholders' Equity and Equity Instruments

3 Months Ended

Dec. 31, 2024

Equity [Abstract]

Stockholders' Equity and Equity Instruments

Stockholders’ Equity and Equity Instruments:

Equity Compensation Awards

$3.9 million and $11.9 million, respectively, of compensation expense pursuant to its stock-based compensation plans. No amounts have been capitalized.

PSUs

The following table summarizes stock-based compensation activity during the three months ended December 31, 2024:


	Stock Options			RSUs			PSUs(a)
	Number	Weighted-average exercise price		Number	Weighted-average fair value		Number	Weighted-average fair value
Outstanding at September 30, 2024	187,023	$	62.85	451,091	$	27.93	229,469	$	40.26
Granted	—	—		749,627	12.83		214,673	16.57
Exercised(b)	—	—		—	—		—	—
Released from restriction(b)	—	—		(108,023)	32.70		—	—
Cancelled/expired	(3,279)	64.12		(5,843)	18.03		—	—
Outstanding at December 31, 2024	183,744	$	62.83	1,086,852	$	17.09	444,142	$	28.81

(a)Until the performance period is completed, PSUs are included in the table at the target level at their grant date and at that level represent one share of common stock per PSU.

(b)Common stock issued for exercised options and for vested and earned RSUs and PSUs was issued from treasury stock.

Accumulated Other Comprehensive Loss (“AOCL”)


Three Months Ended December 31, 2024(a)	Gains and (Losses) on Cash Flow Hedges		Defined Benefit Pension		Other Post-Employment Benefits		Foreign Currency		Total
Beginning balance	$	(1.3)	$	(6.2)	$	1.4	$	(90.3)	$	(96.4)
Other comprehensive loss before reclassifications(b)	(0.9)		—		—		(33.3)		(34.2)
Amounts reclassified from AOCL	0.6		0.2		(0.1)		—		0.7
Net current period other comprehensive income (loss)	(0.3)		0.2		(0.1)		(33.3)		(33.5)
Ending balance	$	(1.6)	$	(6.0)	$	1.3	$	(123.6)	$	(129.9)


Three Months Ended December 31, 2023(a)	Gains and (Losses) on Cash Flow Hedges		Defined Benefit Pension		Other Post-Employment Benefits		Foreign Currency		Total
Beginning balance	$	(1.4)	$	(6.6)	$	1.7	$	(98.4)	$	(104.7)
Other comprehensive income before reclassifications(b)	(2.6)		—		—		14.6		12.0
Amounts reclassified from AOCL	0.8		0.2		—		—		1.0
Net current period other comprehensive income	(1.8)		0.2		—		14.6		13.0
Ending balance	$	(3.2)	$	(6.4)	$	1.7	$	(83.8)	$	(91.7)

(a)With the exception of the CTA, for which no tax effect is recorded, the changes in the components of AOCL presented in the tables above are reflected net of applicable income taxes.

The amounts reclassified from AOCL to expense (income) for the three months ended December 31, 2024 and 2023, are shown below (in millions):


	Amount Reclassified from AOCL
	Three Months Ended December 31,				Line Item Impacted in the Consolidated Statements of Operations
	2024		2023
Loss (gain) on cash flow hedges:
Natural gas instruments	$	0.6	$	0.8		Product cost

Income tax expense	—		—
Reclassifications, net of income taxes	0.6		0.8
Amortization of defined benefit pension:
Amortization of loss	0.3		0.3			Product cost
Income tax benefit	(0.1)		(0.1)
Reclassifications, net of income taxes	0.2		0.2
Amortization of other post-employment benefits:
Amortization of gain	(0.1)		—			Product cost
Income tax expense	—		—
Reclassifications, net of income taxes	(0.1)		—

Total reclassifications, net of income taxes	$	0.7	$	1.0

Derivative Financial Instruments

3 Months Ended

Dec. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments:

Natural Gas Derivative Instruments

The following tables present the fair value of the Company’s derivatives (in millions):


	Asset Derivatives			Liability Derivatives
	Consolidated Balance Sheet Location	December 31, 2024		Consolidated Balance Sheet Location	December 31, 2024
Derivatives designated as hedging instruments:
Commodity contracts	Other current assets	$	0.3	Accrued expenses and other current liabilities	$	2.0
Commodity contracts	Other assets	0.3		Other noncurrent liabilities	0.2
Total derivatives(a)		$	0.6		$	2.2


	Asset Derivatives			Liability Derivatives
	Consolidated Balance Sheet Location	September 30, 2024		Consolidated Balance Sheet Location	September 30, 2024
Derivatives designated as hedging instruments:
Commodity contracts	Other current assets	$	0.5	Accrued expenses and other current liabilities	$	1.7
Commodity contracts	Other assets	0.1		Other noncurrent liabilities	0.2
Total derivatives(a)		$	0.6		$	1.9

Fair Value Measurements

3 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements:

The estimated fair values for each type of instrument are presented below (in millions):


	December 31, 2024		Level One		Level Two		Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)	$	3.4	$	3.4	$	—	$	—
Derivatives – natural gas instruments, net	0.6		—		0.6		—
Total Assets	$	4.0	$	3.4	$	0.6	$	—
Liability Class:
Derivatives - natural gas instruments, net	$	(2.2)	$	—	$	(2.2)	$	—

Liabilities related to non-qualified savings plan	(3.4)		(3.4)		—		—

Total Liabilities	$	(5.6)	$	(3.4)	$	(2.2)	$	—


	September 30, 2024		Level One		Level Two		Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)	$	3.1	$	3.1	$	—	$	—
Derivatives - natural gas instruments, net	0.6		—		0.6		—
Total Assets	$	3.7	$	3.1	$	0.6	$	—
Liability Class:
Derivatives - natural gas instruments, net	$	(1.9)	$	—	$	(1.9)	$	—
Liabilities related to non-qualified savings plan	(3.1)		(3.1)		—		—
Total Liabilities	$	(5.0)	$	(3.1)	$	(1.9)	$	—

The following table presents the fair value of the Company’s total contingent consideration arrangement (in millions):


Consolidated Balance Sheet Location	December 31, 2024		September 30, 2024
Accrued expenses and other current liabilities	$	0.1	$	—
Other noncurrent liabilities	7.8		7.9
Total contingent consideration	$	7.9	$	7.9

Earnings per Share

3 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share:


	Three Months Ended December 31,
	2024		2023
Numerator:
Net loss	$	(23.6)	$	(75.3)
Less: net earnings allocated to participating securities(a)	—		(0.1)


Net loss available to common stockholders	$	(23.6)	$	(75.4)

Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share(b)	41,441		41,205
Weighted-average awards outstanding	—		—
Shares for diluted earnings per share	41,441		41,205



Basic net loss per common share	$	(0.57)	$	(1.83)



Diluted net loss per common share	$	(0.57)	$	(1.83)

Related Party Transactions	3 Months Ended
Related Party Transactions	Dec. 31, 2024
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions:During both the three months ended December 31, 2024 and 2023, the Company recorded SOP sales of approximately $1.1 million and $0.8 million, respectively, to certain subsidiaries of Koch Industries, Inc. As of December 31, 2024 and September 30, 2024, the Company had approximately $0.6 million and $0.3 million, respectively, of receivables from related parties on its Consolidated Balance Sheets. There were no amounts payable outstanding as of December 31, 2024.

Subsequent Events	3 Months Ended
Subsequent Events	Dec. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events: [ ]

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (23.6)	$ (75.3)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Accounting Policies and Basis of Presentation (Policies)	3 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Basis of Consolidation	CMI is a holding company with no significant operations other than those of its wholly-owned subsidiaries. The consolidated financial statements include the accounts of CMI and its wholly-owned domestic and foreign subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Basis of Presentation	The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete consolidated financial statements. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements of the Company for the annual period ended September 30, 2024, as filed with the Securities and Exchange Commission (the “SEC”) in its Annual Report on Form 10-K on December 16, 2024 (“2024 Form 10-K”). In the opinion of management, all adjustments, consisting of normal recurring adjustments considered necessary for a fair presentation, have been included.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures”, which updates reportable segment disclosure requirements primarily to include enhanced disclosures about significant segment expenses. The amendments are effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements. Management is currently evaluating this ASU to determine its impact on the Company's disclosures. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures”, which updates income tax disclosures by requiring consistent categories and additional disaggregation of information in the rate reconciliation and income taxes paid by jurisdiction. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied prospectively; however, retrospective application is permitted. Management is currently evaluating this ASU to determine its impact on the Company’s disclosures. In November 2024, the FASB issued amended guidance related to disclosure of disaggregated expenses (“ASU 2024-03”). This amendment requires public business entities to provide detailed disclosures in the notes to financial statements disaggregating specific expense categories, including employee compensation, depreciation, and intangible asset amortization, as well as certain other disclosures to provide enhanced transparency into the nature and function of expenses. This new guidance is effective for annual periods beginning in the Company’s fiscal 2028 and interim periods following annual adoption, with early adoption permitted. This guidance will be applied on a prospective basis with retrospective application permitted. Management is currently evaluating this ASU to determine its impact on the Company’s disclosures.
Deferred Revenue	Deferred Revenue Deferred revenue represents collections under non-cancellable contracts before the related product or service is transferred to the customer. The portion of deferred revenue that is anticipated to be recognized as revenue during the succeeding twelve-month period is recorded in accrued expenses and other current liabilities on the Consolidated Balance Sheets.
Derivative Financial Instruments	The Company is subject to various types of market risks, including interest rate risk, foreign currency exchange rate transaction and translation risk and commodity pricing risk. Management may take actions to mitigate the exposure to these types of risks, including entering into forward purchase contracts and other financial instruments. The Company manages a portion of its commodity pricing risks and foreign currency exchange rate risks by using derivative instruments. From time to time, the Company may enter into foreign exchange contracts to mitigate foreign exchange risk. The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangement. The Company enters into natural gas derivative instruments and foreign currency derivative instruments with counterparties it views as creditworthy. However, the Company does attempt to mitigate its counterparty credit risk exposures by, among other things, entering into master netting agreements with some of these counterparties. The Company records derivative financial instruments as either assets or liabilities at fair value in its Consolidated Balance Sheets. The assets and liabilities recorded as of December 31, 2024 and September 30, 2024 were not material. Derivatives qualify for treatment as hedges when there is a high correlation between the change in fair value of the derivative instrument and the related change in value of the underlying hedged item. Depending on the exposure being hedged, the Company must designate the hedging instrument as a fair value hedge, a cash flow hedge or a net investment in foreign operations hedge. For the qualifying derivative instruments that have been designated as cash flow hedges, the effective portion of the change in fair value is recognized through earnings when the underlying transaction being hedged affects earnings, allowing a derivative’s gains and losses to offset related results from the hedged item in the Consolidated Statements of Operations. Any ineffectiveness related to these instruments accounted for as hedges was not material for any of the periods presented. For derivative instruments that have not been designated as hedges, the entire change in fair value is recorded through earnings in the period of change.

Inventories (Tables)

3 Months Ended

Dec. 31, 2024

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories consist of the following (in millions):


	December 31, 2024		September 30, 2024
Finished goods	$	286.8	$	336.5
Work in process	6.4		6.4
Raw materials and supplies(a)	73.9		71.2
Total inventories	$	367.1	$	414.1

Property, Plant and Equipment, Net (Tables)

3 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment, Net

Property, plant and equipment, net, consists of the following (in millions):


	December 31, 2024		September 30, 2024
Land, buildings and structures, and leasehold improvements	$	550.2	$	559.8
Machinery and equipment	1,120.2		1,149.5
Office furniture and equipment	23.9		24.1
Mineral interests	166.5		170.4
Construction in progress	57.5		56.0
	1,918.3		1,959.8
Less: accumulated depreciation and depletion	(1,139.7)		(1,153.3)
Property, plant and equipment, net	$	778.6	$	806.5

Goodwill and Intangible Assets (Tables)

3 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill are summarized as follows (in millions):


	Corporate & Other
Balance as of September 30, 2024	$	6.0
Foreign currency translation adjustment	(0.2)
Balance as of December 31, 2024	$	5.8

Long-Term Debt (Tables)

3 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Long-term debt consists of the following (in millions):


	December 31, 2024		September 30, 2024
6.75% Senior Notes due December 2027	$	500.0	$	500.0
Term Loan due May 2028	192.5		193.8
Revolving Credit Facility due May 2028	229.6		190.1
AR Securitization Facility expires March 2027	58.2		38.9
	980.3		922.8
Less unamortized debt issuance costs	(5.9)		(5.3)
Total debt	974.4		917.5
Less current portion	(8.7)		(7.5)
Long-term debt	$	965.7	$	910.0

Operating Segments (Tables)

3 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Schedule of Segment Information

Segment information is as follows (in millions):


Three Months Ended December 31, 2024	Salt		Plant Nutrition		Corporate & Other(a)		Total
Sales to external customers	$	242.2	$	61.4	$	3.6	$	307.2
Intersegment sales	—		3.2		(3.2)		—
Shipping and handling cost	71.3		9.3		—		80.6
Operating earnings (loss)(b)	29.4		(3.1)		(25.8)		0.5
Depreciation, depletion and amortization	17.5		7.5		1.8		26.8
Total assets (as of end of period)	1,092.4		388.1		240.4		1,720.9


Three Months Ended December 31, 2023	Salt		Plant Nutrition		Corporate & Other(a)		Total
Sales to external customers	$	274.3	$	49.7	$	17.7	$	341.7
Intersegment sales	—		3.1		(3.1)		—
Shipping and handling cost	83.7		7.0		0.6		91.3
Operating earnings (loss)(b)(c)	50.9		(2.3)		(102.2)		(53.6)
Depreciation, depletion and amortization	15.2		8.4		1.9		25.5
Total assets (as of end of period)	1,056.6		469.7		278.9		1,805.2

Schedule of Disaggregated Revenue by Product Type

Disaggregated revenue by product type is as follows (in millions):


Three Months Ended December 31, 2024	Salt		Plant Nutrition		Corporate & Other(a)		Total
Highway Deicing Salt	$	138.1	$	—	$	—	$	138.1
Consumer & Industrial Salt	104.1		—		—		104.1


SOP	—		64.6		—		64.6


Eliminations & Other	—		(3.2)		3.6		0.4
Sales to external customers	$	242.2	$	61.4	$	3.6	$	307.2


Three Months Ended December 31, 2023	Salt		Plant Nutrition		Corporate & Other(a)		Total
Highway Deicing Salt	$	159.4	$	—	$	—	$	159.4
Consumer & Industrial Salt	114.9		—		—		114.9


SOP	—		52.8		—		52.8
Fire Retardant	—		—		14.0		14.0
Revenue from Services	—		—		0.5		0.5
Eliminations & Other	—		(3.1)		3.2		0.1
Sales to external customers	$	274.3	$	49.7	$	17.7	$	341.7

Schedule of Revenue by Geographic Area

The Company’s revenue by geographic area is as follows (in millions):


	Three Months Ended December 31,
Revenue	2024		2023
United States(a)	$	212.7	$	250.9
Canada	79.3		77.6
United Kingdom	11.2		13.0
Other	4.0		0.2
Total revenue	$	307.2	$	341.7

(a)United States sales exclude product sold to foreign customers at U.S. ports.

Stockholders' Equity and Equity Instruments (Tables)

3 Months Ended

Dec. 31, 2024

Equity [Abstract]

Schedule of Stock-Based Compensation Activity

The following table summarizes stock-based compensation activity during the three months ended December 31, 2024:


	Stock Options			RSUs			PSUs(a)
	Number	Weighted-average exercise price		Number	Weighted-average fair value		Number	Weighted-average fair value
Outstanding at September 30, 2024	187,023	$	62.85	451,091	$	27.93	229,469	$	40.26
Granted	—	—		749,627	12.83		214,673	16.57
Exercised(b)	—	—		—	—		—	—
Released from restriction(b)	—	—		(108,023)	32.70		—	—
Cancelled/expired	(3,279)	64.12		(5,843)	18.03		—	—
Outstanding at December 31, 2024	183,744	$	62.83	1,086,852	$	17.09	444,142	$	28.81

(a)Until the performance period is completed, PSUs are included in the table at the target level at their grant date and at that level represent one share of common stock per PSU.

(b)Common stock issued for exercised options and for vested and earned RSUs and PSUs was issued from treasury stock.

Schedule of Components and Changes in Accumulated Other Comprehensive Income (Loss)

The components of and changes in AOCL are as follows (in millions):


Three Months Ended December 31, 2024(a)	Gains and (Losses) on Cash Flow Hedges		Defined Benefit Pension		Other Post-Employment Benefits		Foreign Currency		Total
Beginning balance	$	(1.3)	$	(6.2)	$	1.4	$	(90.3)	$	(96.4)
Other comprehensive loss before reclassifications(b)	(0.9)		—		—		(33.3)		(34.2)
Amounts reclassified from AOCL	0.6		0.2		(0.1)		—		0.7
Net current period other comprehensive income (loss)	(0.3)		0.2		(0.1)		(33.3)		(33.5)
Ending balance	$	(1.6)	$	(6.0)	$	1.3	$	(123.6)	$	(129.9)


Three Months Ended December 31, 2023(a)	Gains and (Losses) on Cash Flow Hedges		Defined Benefit Pension		Other Post-Employment Benefits		Foreign Currency		Total
Beginning balance	$	(1.4)	$	(6.6)	$	1.7	$	(98.4)	$	(104.7)
Other comprehensive income before reclassifications(b)	(2.6)		—		—		14.6		12.0
Amounts reclassified from AOCL	0.8		0.2		—		—		1.0
Net current period other comprehensive income	(1.8)		0.2		—		14.6		13.0
Ending balance	$	(3.2)	$	(6.4)	$	1.7	$	(83.8)	$	(91.7)

(a)With the exception of the CTA, for which no tax effect is recorded, the changes in the components of AOCL presented in the tables above are reflected net of applicable income taxes.

Schedule of Amounts Reclassified from AOCL to Expense (Income)

The amounts reclassified from AOCL to expense (income) for the three months ended December 31, 2024 and 2023, are shown below (in millions):


	Amount Reclassified from AOCL
	Three Months Ended December 31,				Line Item Impacted in the Consolidated Statements of Operations
	2024		2023
Loss (gain) on cash flow hedges:
Natural gas instruments	$	0.6	$	0.8		Product cost

Income tax expense	—		—
Reclassifications, net of income taxes	0.6		0.8
Amortization of defined benefit pension:
Amortization of loss	0.3		0.3			Product cost
Income tax benefit	(0.1)		(0.1)
Reclassifications, net of income taxes	0.2		0.2
Amortization of other post-employment benefits:
Amortization of gain	(0.1)		—			Product cost
Income tax expense	—		—
Reclassifications, net of income taxes	(0.1)		—

Total reclassifications, net of income taxes	$	0.7	$	1.0

Derivative Financial Instruments (Tables)

3 Months Ended

Dec. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivatives

The following tables present the fair value of the Company’s derivatives (in millions):


	Asset Derivatives			Liability Derivatives
	Consolidated Balance Sheet Location	December 31, 2024		Consolidated Balance Sheet Location	December 31, 2024
Derivatives designated as hedging instruments:
Commodity contracts	Other current assets	$	0.3	Accrued expenses and other current liabilities	$	2.0
Commodity contracts	Other assets	0.3		Other noncurrent liabilities	0.2
Total derivatives(a)		$	0.6		$	2.2


	Asset Derivatives			Liability Derivatives
	Consolidated Balance Sheet Location	September 30, 2024		Consolidated Balance Sheet Location	September 30, 2024
Derivatives designated as hedging instruments:
Commodity contracts	Other current assets	$	0.5	Accrued expenses and other current liabilities	$	1.7
Commodity contracts	Other assets	0.1		Other noncurrent liabilities	0.2
Total derivatives(a)		$	0.6		$	1.9

Fair Value Measurements (Tables)

3 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Schedule of Estimated Fair Values for Type of Instrument

The estimated fair values for each type of instrument are presented below (in millions):


	December 31, 2024		Level One		Level Two		Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)	$	3.4	$	3.4	$	—	$	—
Derivatives – natural gas instruments, net	0.6		—		0.6		—
Total Assets	$	4.0	$	3.4	$	0.6	$	—
Liability Class:
Derivatives - natural gas instruments, net	$	(2.2)	$	—	$	(2.2)	$	—

Liabilities related to non-qualified savings plan	(3.4)		(3.4)		—		—

Total Liabilities	$	(5.6)	$	(3.4)	$	(2.2)	$	—


	September 30, 2024		Level One		Level Two		Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)	$	3.1	$	3.1	$	—	$	—
Derivatives - natural gas instruments, net	0.6		—		0.6		—
Total Assets	$	3.7	$	3.1	$	0.6	$	—
Liability Class:
Derivatives - natural gas instruments, net	$	(1.9)	$	—	$	(1.9)	$	—
Liabilities related to non-qualified savings plan	(3.1)		(3.1)		—		—
Total Liabilities	$	(5.0)	$	(3.1)	$	(1.9)	$	—

Schedule of Total Contingent Consideration

The following table presents the fair value of the Company’s total contingent consideration arrangement (in millions):


Consolidated Balance Sheet Location	December 31, 2024		September 30, 2024
Accrued expenses and other current liabilities	$	0.1	$	—
Other noncurrent liabilities	7.8		7.9
Total contingent consideration	$	7.9	$	7.9

Earnings per Share (Tables)

3 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per common share (in millions, except for share and per-share data):


	Three Months Ended December 31,
	2024		2023
Numerator:
Net loss	$	(23.6)	$	(75.3)
Less: net earnings allocated to participating securities(a)	—		(0.1)


Net loss available to common stockholders	$	(23.6)	$	(75.4)

Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share(b)	41,441		41,205
Weighted-average awards outstanding	—		—
Shares for diluted earnings per share	41,441		41,205



Basic net loss per common share	$	(0.57)	$	(1.83)



Diluted net loss per common share	$	(0.57)	$	(1.83)

Revenues (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Deferred revenue	$ 3.6	$ 3.6

Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Inventory Disclosure [Abstract]
Finished goods	$ 286.8	$ 336.5
Work in process	6.4	6.4
Raw materials and supplies	73.9	71.2
Total inventories	367.1	414.1
Raw materials and supplies, noncurrent	$ 41.1	$ 42.2

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,918.3	$ 1,959.8
Less: accumulated depreciation and depletion	(1,139.7)	(1,153.3)
Property, plant and equipment, net	778.6	806.5
Land, buildings and structures, and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	550.2	559.8
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,120.2	1,149.5
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23.9	24.1
Mineral interests
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	166.5	170.4
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 57.5	$ 56.0

Goodwill and Intangible Assets (Details) $ in Millions	3 Months Ended
Goodwill and Intangible Assets (Details) $ in Millions	Dec. 31, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 6.0
Goodwill, ending balance	5.8
Corporate and Other
Goodwill [Roll Forward]
Goodwill, beginning balance	6.0
Foreign currency translation adjustment	(0.2)
Goodwill, ending balance	$ 5.8

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Income Tax Disclosure [Line Items]
Nondeductible executive compensation	$ 1.0
Prepaid taxes	11.2	$ 11.0
U.S. Federal
Income Tax Disclosure [Line Items]
Deferred tax asset valuation allowance recorded	9.5
Foreign Tax Authority
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	78.4	76.4
Foreign Tax Authority \| Canadian Tax Authority
Income Tax Disclosure [Line Items]
Total reassessments including interest	192.8
Amount of security posted in the form of a performance bond	152.3
Amount of security posted in the form of cash	34.6	34.6
State and Local \| NOL Carryforwards Expire Beginning in 2035
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 6.6	$ 6.1

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Debt Instrument [Line Items]
Long-term debt, gross	$ 980.3	$ 922.8
Less unamortized debt issuance costs	(5.9)	(5.3)
Total debt	974.4	917.5
Less current portion	(8.7)	(7.5)
Long-term debt	$ 965.7	$ 910.0
Senior Notes \| 6.75% Senior Notes due December 2027
Debt Instrument [Line Items]
Stated interest rate	6.75%	6.75%
Long-term debt, gross	$ 500.0	$ 500.0
Line of Credit \| Term Loan due May 2028
Debt Instrument [Line Items]
Long-term debt, gross	192.5	193.8
Line of Credit \| Revolving Credit Facility due May 2028
Debt Instrument [Line Items]
Long-term debt, gross	229.6	190.1
Line of Credit \| AR Securitization Facility expires March 2027
Debt Instrument [Line Items]
Long-term debt, gross	$ 58.2	$ 38.9

Long-Term Debt - Narrative (Details) - Line of Credit	3 Months Ended
Long-Term Debt - Narrative (Details) - Line of Credit	Dec. 31, 2024 USD ($)	Jul. 01, 2026 USD ($)	Dec. 12, 2024 USD ($)	Sep. 30, 2024	Nov. 26, 2019 USD ($)
2023 Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	$ 2,000,000
Additional legal fees	1,000,000
2023 Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount of credit facility	325,000,000
Outstanding letters of credit	14,900,000
Availability under revolving credit facility	$ 80,500,000
2023 Credit Agreement \| Fiscal Quarter Ended December 31, 2024
Debt Instrument [Line Items]
Consolidated total net leverage ratio			6.5
2023 Credit Agreement \| Fiscal Quarter Ended March 31, 2026 and Thereafter
Debt Instrument [Line Items]
Consolidated total net leverage ratio			4.50
Revolving Credit Facility Due January 2025
Debt Instrument [Line Items]
Weighted average interest rate of debt (as a percent)	7.30%			7.70%
Revolving Credit Facility Due January 2025 \| Minimum
Debt Instrument [Line Items]
Weighted average interest rate of debt (as a percent)	7.20%			7.30%
Revolving Credit Facility Due January 2025 \| Maximum
Debt Instrument [Line Items]
Weighted average interest rate of debt (as a percent)	7.60%			9.50%
Revolving Credit Facility Due January 2025 \| Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount of credit facility			$ 325,000,000		$ 375,000,000
Maximum unrestricted cash	$ 75,000,000
Revolving Credit Facility Due January 2025 \| Revolving Credit Facility \| Forecast
Debt Instrument [Line Items]
Aggregate principal amount of credit facility		$ 250,000,000

Commitments and Contingencies (Details) $ in Millions	3 Months Ended
Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2024 USD ($)	Oct. 25, 2024 productionLot
Commitments and Contingencies Disclosure [Abstract]
Number of production lots recalled \| productionLot		9
Production recall expense	$ 0.9
Loss contingency, receivable	35.0
Estimated insurance recoveries	$ (35.0)

Operating Segments - Narrative (Details) - segment	3 Months Ended
Operating Segments - Narrative (Details) - segment	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting [Abstract]
Number of reportable segments	2	2

Operating Segments - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Sales	$ 307.2	$ 341.7
Operating earnings (loss)	0.5	(53.6)
Depreciation, depletion and amortization	26.8	25.5
Total assets (as of end of period)	1,720.9	1,805.2
Shipping and handling cost
Segment Reporting Information [Line Items]
Shipping and handling cost	80.6	91.3
Operating Segments \| Salt
Segment Reporting Information [Line Items]
Sales	242.2	274.3
Operating earnings (loss)	29.4	50.9
Depreciation, depletion and amortization	17.5	15.2
Total assets (as of end of period)	1,092.4	1,056.6
Operating Segments \| Salt \| Shipping and handling cost
Segment Reporting Information [Line Items]
Shipping and handling cost	71.3	83.7
Operating Segments \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales	61.4	49.7
Operating earnings (loss)	(3.1)	(2.3)
Depreciation, depletion and amortization	7.5	8.4
Total assets (as of end of period)	388.1	469.7
Operating Segments \| Plant Nutrition \| Shipping and handling cost
Segment Reporting Information [Line Items]
Shipping and handling cost	9.3	7.0
Corporate and Other
Segment Reporting Information [Line Items]
Sales	3.6	17.7
Operating earnings (loss)	(25.8)	(102.2)
Depreciation, depletion and amortization	1.8	1.9
Total assets (as of end of period)	240.4	278.9
Corporate and Other \| Shipping and handling cost
Segment Reporting Information [Line Items]
Shipping and handling cost	0.0	0.6
Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales	(3.2)	(3.1)
Intersegment Eliminations \| Salt
Segment Reporting Information [Line Items]
Sales	0.0	0.0
Intersegment Eliminations \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales	$ 3.2	$ 3.1

Operating Segments - Schedule of Disaggregated Revenue by Product Type (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Sales to external customers	$ 307.2	$ 341.7
Production recall expense	0.9
Impairment		74.8
Severance costs		2.5
Restructuring charges		1.1
Fortress
Segment Reporting Information [Line Items]
Increase to contingent consideration liability		1.6
Highway Deicing Salt
Segment Reporting Information [Line Items]
Sales to external customers	138.1	159.4
Consumer & Industrial Salt
Segment Reporting Information [Line Items]
Sales to external customers	104.1	114.9
SOP
Segment Reporting Information [Line Items]
Sales to external customers	64.6	52.8
Fire Retardant
Segment Reporting Information [Line Items]
Sales to external customers		14.0
Revenue from Services
Segment Reporting Information [Line Items]
Sales to external customers		0.5
Eliminations & Other
Segment Reporting Information [Line Items]
Sales to external customers	0.4	0.1
Operating Segments \| Salt
Segment Reporting Information [Line Items]
Sales to external customers	242.2	274.3
Operating Segments \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales to external customers	61.4	49.7
Operating Segments \| Highway Deicing Salt \| Salt
Segment Reporting Information [Line Items]
Sales to external customers	138.1	159.4
Operating Segments \| Highway Deicing Salt \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales to external customers	0.0	0.0
Operating Segments \| Consumer & Industrial Salt \| Salt
Segment Reporting Information [Line Items]
Sales to external customers	104.1	114.9
Operating Segments \| Consumer & Industrial Salt \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales to external customers	0.0	0.0
Operating Segments \| SOP \| Salt
Segment Reporting Information [Line Items]
Sales to external customers	0.0	0.0
Operating Segments \| SOP \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales to external customers	64.6	52.8
Operating Segments \| Fire Retardant \| Salt
Segment Reporting Information [Line Items]
Sales to external customers		0.0
Operating Segments \| Fire Retardant \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales to external customers		0.0
Operating Segments \| Revenue from Services \| Salt
Segment Reporting Information [Line Items]
Sales to external customers		0.0
Operating Segments \| Revenue from Services \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales to external customers		0.0
Operating Segments \| Eliminations & Other \| Salt
Segment Reporting Information [Line Items]
Sales to external customers	0.0	0.0
Operating Segments \| Eliminations & Other \| Plant Nutrition
Segment Reporting Information [Line Items]
Sales to external customers	(3.2)	(3.1)
Corporate and Other
Segment Reporting Information [Line Items]
Sales to external customers	3.6	17.7
Corporate and Other \| Highway Deicing Salt
Segment Reporting Information [Line Items]
Sales to external customers	0.0	0.0
Corporate and Other \| Consumer & Industrial Salt
Segment Reporting Information [Line Items]
Sales to external customers	0.0	0.0
Corporate and Other \| SOP
Segment Reporting Information [Line Items]
Sales to external customers	0.0	0.0
Corporate and Other \| Fire Retardant
Segment Reporting Information [Line Items]
Sales to external customers		14.0
Corporate and Other \| Revenue from Services
Segment Reporting Information [Line Items]
Sales to external customers		0.5
Corporate and Other \| Eliminations & Other
Segment Reporting Information [Line Items]
Sales to external customers	$ 3.6	$ 3.2

Operating Segments - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 307.2	$ 341.7
United States
Segment Reporting Information [Line Items]
Total revenue	212.7	250.9
Canada
Segment Reporting Information [Line Items]
Total revenue	79.3	77.6
United Kingdom
Segment Reporting Information [Line Items]
Total revenue	11.2	13.0
Other
Segment Reporting Information [Line Items]
Total revenue	$ 4.0	$ 0.2

Stockholders' Equity and Equity Instruments - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Mar. 31, 2024	Feb. 28, 2022	Dec. 31, 2024	Dec. 31, 2023	May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock reissued (in shares)			222,155
Tax deficiency from equity compensation awards recorded as an increase to income tax expense			$ 0.5
Share-based payment arrangement, expense			$ 3.9	$ 11.9
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reissued share of treasury stock (in shares)			108,023
Stock Payments
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reissued share of treasury stock (in shares)			10,224
Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld related to vesting of RSUs and PSUs (in shares)			34,955
Fair value of stock withheld related to vesting of RSUs and PSUs			$ 0.5
Scorecard PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			3 years
Modifier change			20.00%
Scorecard PSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation payment award performance percentage			0.00%
Scorecard PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation payment award performance percentage			200.00%
2020 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)					2,977,933
Shares authorized for issuance (in shares)	3,000,000	750,000

Stockholders' Equity and Equity Instruments - Schedule of Stock-Based Compensation Activity (Details)	3 Months Ended
	Dec. 31, 2024 $ / shares shares
Stock Options
Number
Outstanding at beginning of period (in shares)	187,023
Granted (in shares)	0
Exercised (in shares)	0
Released from restriction (in shares)	0
Cancelled/expired (in shares)	(3,279)
Outstanding at end of period (in shares)	183,744
Weighted-average exercise price
Weighted-average exercise price at beginning of period (in dollars per share) \| $ / shares	$ 62.85
Weighted-average exercise price, granted (in dollars per share) \| $ / shares	0
Weighted-average exercise price, exercised (in dollars per share) \| $ / shares	0
Weighted-average exercise price, released from restriction (in dollars per share) \| $ / shares	0
Weighted-average exercise price, cancelled/expired (in dollars per share) \| $ / shares	64.12
Weighted-average exercise price at end of period (in dollars per share) \| $ / shares	$ 62.83
RSUs
Number
Outstanding at beginning of period (in shares)	451,091
Granted (in shares)	749,627
Exercised (in shares)	0
Released from restriction (in shares)	(108,023)
Cancelled/expired (in shares)	(5,843)
Outstanding at end of period (in shares)	1,086,852
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share) \| $ / shares	$ 27.93
Weighted-average fair value, granted (in dollars per share) \| $ / shares	12.83
Weighted-average fair value, exercised (in dollars per share) \| $ / shares	0
Weighted-average fair value, released from restriction (in dollars per share) \| $ / shares	32.70
Weighted-average fair value, cancelled/expired (in dollars per share) \| $ / shares	18.03
Weighted-average fair value at end of period (in dollars per share) \| $ / shares	$ 17.09
PSUs
Number
Outstanding at beginning of period (in shares)	229,469
Granted (in shares)	214,673
Exercised (in shares)	0
Released from restriction (in shares)	0
Cancelled/expired (in shares)	0
Outstanding at end of period (in shares)	444,142
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share) \| $ / shares	$ 40.26
Weighted-average fair value, granted (in dollars per share) \| $ / shares	16.57
Weighted-average fair value, exercised (in dollars per share) \| $ / shares	0
Weighted-average fair value, released from restriction (in dollars per share) \| $ / shares	0
Weighted-average fair value, cancelled/expired (in dollars per share) \| $ / shares	0
Weighted-average fair value at end of period (in dollars per share) \| $ / shares	$ 28.81
PSU at grant date (in shares per unit)	1

Stockholders' Equity and Equity Instruments - Schedule of Components and Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 316.6	$ 521.0
Other comprehensive (loss) income before reclassifications	(34.2)	12.0
Amounts reclassified from AOCL	0.7	1.0
Net current period other comprehensive income (loss)	(33.5)	13.0
Ending balance	263.0	463.4
Gain (loss) on foreign exchange of intercompany notes of long-term nature	5.4	(2.3)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(96.4)	(104.7)
Ending balance	(129.9)	(91.7)
Gains and (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1.3)	(1.4)
Other comprehensive (loss) income before reclassifications	(0.9)	(2.6)
Amounts reclassified from AOCL	0.6	0.8
Net current period other comprehensive income (loss)	(0.3)	(1.8)
Ending balance	(1.6)	(3.2)
Benefit Plans \| Defined Benefit Pension
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(6.2)	(6.6)
Other comprehensive (loss) income before reclassifications	0.0	0.0
Amounts reclassified from AOCL	0.2	0.2
Net current period other comprehensive income (loss)	0.2	0.2
Ending balance	(6.0)	(6.4)
Benefit Plans \| Other Post-Employment Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	1.4	1.7
Other comprehensive (loss) income before reclassifications	0.0	0.0
Amounts reclassified from AOCL	(0.1)	0.0
Net current period other comprehensive income (loss)	(0.1)	0.0
Ending balance	1.3	1.7
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(90.3)	(98.4)
Other comprehensive (loss) income before reclassifications	(33.3)	14.6
Amounts reclassified from AOCL	0.0	0.0
Net current period other comprehensive income (loss)	(33.3)	14.6
Ending balance	$ (123.6)	$ (83.8)

Stockholders' Equity and Equity Instruments - Schedule of Amounts Reclassified from AOCL to Expense (Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)	$ 9.7	$ 3.6
Reclassifications, net of income taxes	(23.6)	(75.3)
Product cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	(192.3)	(179.3)
Amount Reclassified from AOCL
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of income taxes	0.7	1.0
Amount Reclassified from AOCL \| Loss (gain) on cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)	0.0	0.0
Reclassifications, net of income taxes	0.6	0.8
Amount Reclassified from AOCL \| Loss (gain) on cash flow hedges: \| Natural gas instruments \| Product cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	0.6	0.8
Amount Reclassified from AOCL \| Amortization of defined benefit pension:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)	(0.1)	(0.1)
Reclassifications, net of income taxes	0.2	0.2
Amount Reclassified from AOCL \| Amortization of defined benefit pension: \| Product cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	0.3	0.3
Amount Reclassified from AOCL \| Amortization of other post-employment benefits:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)	0.0	0.0
Reclassifications, net of income taxes	(0.1)	0.0
Amount Reclassified from AOCL \| Amortization of other post-employment benefits: \| Product cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	$ (0.1)	$ 0.0

Derivative Financial Instruments - Narrative (Details) MMBTU in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($) MMBTU	Sep. 30, 2024 MMBTU
Derivatives, Fair Value [Line Items]
Net gains to be reclassified from accumulated other comprehensive loss to earnings during the next 12 months \| $	$ 1.7
Natural gas instruments
Derivatives, Fair Value [Line Items]
Notional amount (in MMBtus) \| MMBTU	2.6	2.3
Natural gas instruments \| Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Percent of forecasted usage to be hedged	90.00%
Maximum period which the company hedges in advance of forecasted purchase	36 months

Derivative Financial Instruments - Schedule of Fair Value of Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0.6	$ 0.6
Liability Derivatives	2.2	1.9
Natural gas instruments
Derivatives, Fair Value [Line Items]
Netting of contracts in a receivable position against contracts in payable position	0.6	0.6
Natural gas instruments \| Derivatives Designated as Hedging Instruments \| Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.3	0.5
Natural gas instruments \| Derivatives Designated as Hedging Instruments \| Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2.0	1.7
Natural gas instruments \| Derivatives Designated as Hedging Instruments \| Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.3	0.1
Natural gas instruments \| Derivatives Designated as Hedging Instruments \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0.2	$ 0.2

Fair Value Measurements - Schedule of Estimated Fair Values for Type of Instrument (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024
Asset Class:
Mutual fund investments in a non-qualified savings plan	$ 3.4	$ 3.1
Total Assets	4.0	3.7
Liability Class:
Liabilities related to non-qualified savings plan	(3.4)	(3.1)
Total Liabilities	(5.6)	(5.0)
Natural Gas Instruments, Net
Asset Class:
Derivatives - natural gas instruments, net	0.6	0.6
Liability Class:
Derivative liabilities	$ (2.2)	$ (1.9)
Common Stock, Large Cap US Companies \| Mutual Fund Investments, Concentration Risk \| Investment Benchmark
Liability Class:
Investment concentration risk (as a percent)	25.00%	35.00%
Common Stock of Small to Mid Cap US Companies \| Mutual Fund Investments, Concentration Risk \| Investment Benchmark
Liability Class:
Investment concentration risk (as a percent)	5.00%	5.00%
Common Stock, International Companies \| Mutual Fund Investments, Concentration Risk \| Investment Benchmark
Liability Class:
Investment concentration risk (as a percent)		5.00%
Bond Funds \| Mutual Fund Investments, Concentration Risk \| Investment Benchmark
Liability Class:
Investment concentration risk (as a percent)	10.00%	10.00%
Short-Term Investments \| Mutual Fund Investments, Concentration Risk \| Investment Benchmark
Liability Class:
Investment concentration risk (as a percent)	20.00%	5.00%
Blended Funds \| Mutual Fund Investments, Concentration Risk \| Investment Benchmark
Liability Class:
Investment concentration risk (as a percent)	40.00%	40.00%
Level One
Asset Class:
Mutual fund investments in a non-qualified savings plan	$ 3.4	$ 3.1
Total Assets	3.4	3.1
Liability Class:
Liabilities related to non-qualified savings plan	(3.4)	(3.1)
Total Liabilities	(3.4)	(3.1)
Level One \| Natural Gas Instruments, Net
Asset Class:
Derivatives - natural gas instruments, net	0.0	0.0
Liability Class:
Derivative liabilities	0.0	0.0
Level Two
Asset Class:
Mutual fund investments in a non-qualified savings plan	0.0	0.0
Total Assets	0.6	0.6
Liability Class:
Liabilities related to non-qualified savings plan	0.0	0.0
Total Liabilities	(2.2)	(1.9)
Level Two \| Natural Gas Instruments, Net
Asset Class:
Derivatives - natural gas instruments, net	0.6	0.6
Liability Class:
Derivative liabilities	(2.2)	(1.9)
Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan	0.0	0.0
Total Assets	0.0	0.0
Liability Class:
Liabilities related to non-qualified savings plan	0.0	0.0
Total Liabilities	0.0	0.0
Level Three \| Natural Gas Instruments, Net
Asset Class:
Derivatives - natural gas instruments, net	0.0	0.0
Liability Class:
Derivative liabilities	$ 0.0	$ 0.0

Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
	May 05, 2023	Dec. 31, 2023	Dec. 31, 2024	Sep. 30, 2024
Debt Instrument [Line Items]
Mutual fund investments in a non-qualified savings plan			$ 3.4	$ 3.1
Contingent consideration, liability			$ 7.9	$ 7.9
Fortress
Debt Instrument [Line Items]
Contingent consideration, liability	$ 28.0
Performance period	5 years
Contingent consideration period	10 years
Increase to contingent consideration liability		$ 1.6
Senior Notes \| 6.75% Senior Notes due December 2027
Debt Instrument [Line Items]
Stated interest rate			6.75%	6.75%
Fair value of senior notes			$ 492.5	$ 497.0
Senior Notes Due 2027
Debt Instrument [Line Items]
Debt fair value amount			500.0	500.0
Term Loan
Debt Instrument [Line Items]
Fair value of credit agreement debt			416.8	379.1
Aggregate principal amount due at maturity			422.1	383.9
Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Mutual fund investments in a non-qualified savings plan			$ 3.4	$ 3.1

Fair Value Measurements - Schedule of Total Contingent Consideration (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Accrued expenses and other current liabilities	$ 0.1	$ 0.0
Other noncurrent liabilities	7.8	7.9
Total contingent consideration	$ 7.9	$ 7.9

Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net loss	$ (23.6)	$ (75.3)
Less: net earnings allocated to participating securities	0.0	(0.1)
Net (loss) earnings available to common stockholders, basic	(23.6)	(75.4)
Net (loss) earnings available to common stockholders, diluted	$ (23.6)	$ (75.4)
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share (in shares)	41,441	41,205
Weighted-average awards outstanding (in shares)	0	0
Shares for diluted earnings per share (in shares)	41,441	41,205
Basic net (loss) earnings per common share (in dollars per share)	$ (0.57)	$ (1.83)
Diluted net (loss) earnings per common share (in dollars per share)	$ (0.57)	$ (1.83)
Participating securities (in shares)	1,116,000	777,000
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive weighted options outstanding (in shares)	1,184,000	1,572,000

Related Party Transactions (Details) - USD ($)	3 Months Ended
Related Party Transactions (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Related Party Transaction [Line Items]
Total revenue	$ 307,200,000	$ 341,700,000
Receivables	261,700,000		$ 126,100,000
Accounts payable	96,200,000		82,100,000
Koch Minerals & Trading, LLC
Related Party Transaction [Line Items]
Total revenue	1,100,000	$ 800,000
Receivables	600,000		$ 300,000
Accounts payable	$ 0

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