Atmus Filtration (ATMU) 10-Q3 May 242024 Q1 Quarterly reportFinancial data

Company Profile

Cover

Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2024	Apr. 30, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-41710
Entity Registrant Name	Atmus Filtration Technologies Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	88-1611079
Entity Address, Address Line One	26 Century Boulevard
Entity Address, City or Town	Nashville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37214
City Area Code	615
Local Phone Number	514-7339
Title of 12(b) Security	Common Stock, $0.0001 par value
Trading Symbol	ATMU
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		83,355,930
Entity Central Index Key	0001921963
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF NET INCOME - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
NET SALES	[1]	$ 426.6	$ 418.6
Cost of sales		314.8	308.8
GROSS MARGIN		111.8	109.8
OPERATING EXPENSES AND INCOME
Selling, general and administrative expenses		43.3	39.1
Research, development and engineering expenses		10.1	9.8
Equity, royalty and interest income from investees		10.4	8.4
Other operating expense, net		0.2	0.1
OPERATING INCOME		68.6	69.2
Interest expense		10.5	0
Other income (expense), net		0.2	(0.1)
INCOME BEFORE INCOME TAXES		58.3	69.1
Income tax expense		12.8	16.4
NET INCOME		$ 45.5	$ 52.7
PER SHARE DATA:
Weighted-average shares for basic EPS (in shares)		83.3	83.3
Weighted-average shares for diluted EPS (in shares)		83.6	83.3
Basic earnings per share (in dollars per share)		$ 0.55	$ 0.63
Diluted earnings per share (in dollars per share)		$ 0.54	$ 0.63

[1] Includes sales to related parties of $82.3 million for the three months ended March 31, 2024 compared with $89.1 million for the three months ended March 31, 2023.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF NET INCOME (Parenthetical) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
NET SALES	[1]	$ 426.6	$ 418.6
Related Party
NET SALES		$ 82.3	$ 89.1

[1] Includes sales to related parties of $82.3 million for the three months ended March 31, 2024 compared with $89.1 million for the three months ended March 31, 2023.

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 45.5	$ 52.7
Other comprehensive (loss) income, net of tax
Foreign currency translation adjustments	(6.8)	0.9
Total other comprehensive (loss) income, net	(6.8)	0.9
COMPREHENSIVE INCOME	$ 38.7	$ 53.6

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 149.2	$ 168
Accounts and notes receivable, net	262.2	246.8
Inventories	256.9	250
Prepaid expenses and other current assets	31.1	28.2
Total current assets	699.4	693
Property, plant and equipment, net	181.2	174.6
Investments and advances related to equity method investees	83.4	84.8
Goodwill	84.7	84.7
Other assets	55.5	51.5
TOTAL ASSETS	1,104.2	1,088.6
LIABILITIES
Accounts payable	236.5	236.6
Accrued compensation, benefits and retirement costs	17.8	41.8
Current portion of accrued product warranty	6.1	5.4
Current maturities of long-term debt	11.2	7.5
Other accrued expenses	77.8	83.7
Total current liabilities	349.4	375
Long-term debt	588.8	592.5
Accrued product warranty	9.7	8.6
Other liabilities	34.5	31.8
TOTAL LIABILITIES	982.4	1,007.9
Commitments and contingencies (Note 10)
EQUITY
Common stock, $0.0001 par value ($2,000,000,000 shares authorized and $83,355,930 shares issued and outstanding as of March 31, 2024)	0	0
Additional paid-in capital	52.1	49.7
Retained earnings	132.7	87.2
Accumulated other comprehensive loss	(63)	(56.2)
TOTAL EQUITY	121.8	80.7
TOTAL LIABILITIES AND EQUITY	$ 1,104.2	$ 1,088.6

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES
Net income	$ 45.5	$ 52.7
Adjustments to reconcile net income to operating cash flows:
Depreciation and amortization	5.4	5.4
Deferred income taxes	0.1	3.5
Equity in income of investees, net of dividends	0.8	(6.8)
Foreign currency remeasurement and transaction exposure	1.1	(1.6)
Changes in current assets and liabilities:
Trade and other receivables	(18.2)	(4.6)
Inventories	(9.6)	(9.7)
Prepaid expenses and other current assets	(3.2)	(1.1)
Accounts payable	0.3	3.9
Other accrued expenses	(28.4)	(1.5)
Changes in other liabilities	3.3	4.9
Other, net	(5.3)	(2.3)
Net cash (used in) provided by operating activities	(8.2)	42.8
CASH USED IN INVESTING ACTIVITIES
Capital expenditures	(10.6)	(6.4)
Net cash used in investing activities	(10.6)	(6.4)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES
Net transfers to Parent	0	(36.4)
Net cash provided by (used in) financing activities	0	(36.4)
Net decrease in cash and cash equivalents	(18.8)	0
Cash and cash equivalents at beginning of period	168	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	149.2	0
Non-cash investing and financing activities:
Non-cash Capital expenditures	$ 2.6	$ 2.8

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Common Stock	Net Parent Investment	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2022	$ 455.6	$ 0	$ 511.4	$ 0	$ 0	$ (55.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	52.7		52.7
Other comprehensive loss, net of tax	0.9					0.9
Net transfers to Parent	(36.4)		(36.4)
Ending Balance at Mar. 31, 2023	472.8	0	527.7	0	0	(54.9)
Beginning Balance at Dec. 31, 2023	80.7	0	0	49.7	87.2	(56.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45.5				45.5
Other comprehensive loss, net of tax	(6.8)					(6.8)
Share-based awards	2.4			2.4
Ending Balance at Mar. 31, 2024	$ 121.8	$ 0	$ 0	$ 52.1	$ 132.7	$ (63)

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)	Mar. 31, 2024 $ / shares shares
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001
Common stock, shares authorized (in shares)	2,000,000,000
Common stock, shares issued (in shares)	83,355,930
Common stock, shares outstanding (in shares)	83,355,930

DESCRIPTION OF THE BUSINESS

DESCRIPTION OF THE BUSINESS	3 Months Ended
DESCRIPTION OF THE BUSINESS	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF THE BUSINESS	DESCRIPTION OF THE BUSINESS Atmus Filtration Technologies Inc. (“Atmus” or the “Company”) is one of the global leaders of filtration products for on-highway commercial vehicles and off-highway agriculture, construction, mining and power generation vehicles and equipment. Atmus designs and manufactures advanced filtration products, principally under the Fleetguard brand, that provide superior asset protection and enable lower emissions. Atmus estimates that approximately 19% of its net sales in 2023 were generated through first-fit sales to OEMs, where its products are installed as components for new vehicles and equipment. Atmus estimate that approximately 81% of its net sales in 2023 were generated in the aftermarket, where its products are installed as replacement or repair parts, leading to a strong recurring revenue base. Building on its more than 65-year history, Atmus continues to grow and differentiate itself through its global footprint, comprehensive offering of premium products, technology leadership and multi-channel path to market. In April 2022, Cummins Inc. (“Cummins” or the “Parent”) announced its intention to separate its filtration business (the “Filtration Business”) into a standalone publicly traded company (the “Separation”). In preparation for separation from Cummins, Atmus, as its predecessor in interest, was incorporated as a wholly-owned subsidiary of Cummins in Delaware on April 1, 2022 in connection with the planned Separation. Prior to the completion of Atmus’ initial public offering (the “IPO”), Cummins completed, in all material respects, the transfer of the assets and liabilities of the Filtration Business to Atmus and its subsidiaries as detailed in the separation agreement Atmus entered into with Cummins. On September 30, 2022, and as amended on February 15, 2023, Atmus entered into a $1.0 billion credit agreement (“Credit Agreement”) with Cummins and a syndicate of banks, providing for a $600 million term loan facility (the “term loan”) and a $400 million revolving credit facility (the “revolving credit facility”), in anticipation of the Separation. Borrowings under the Credit Agreement did not become available until the IPO occurred. The facilities covered by the Credit Agreement will mature on September 30, 2027. Atmus’ Registration Statement on Form S-1, as amended, filed with the Securities and Exchange Commission (“Commission”) on May 16, 2023, was declared effective on May 25, 2023, and Atmus’ common shares began trading on the New York Stock Exchange under the symbol “ATMU” on May 26, 2023. On May 30, 2023, the IPO was completed through the sale on behalf of certain commercial paper holders of Cummins of 16,243,070 shares of common stock, including the underwriters’ full exercise of their 30-day option to purchase 2,118,661 shares to cover over-allotments. None of the proceeds of the IPO were for the benefit of Atmus. As of the closing of the IPO, Cummins owned approximately 80.5% of the outstanding shares of Atmus common stock. Upon completion of the IPO, Atmus borrowed $650 million, consisting of proceeds of the term loan and amounts drawn under the revolving credit facility, and paid such amounts to Cummins in partial consideration for the Separation. On February 14, 2024, Cummins announced an exchange offer whereby Cummins shareholders could exchange all or a portion of Cummins common stock for shares of Atmus common stock owned by Cummins. The divestiture of Atmus shares by Cummins was completed on March 18, 2024 and resulted in the full separation of Atmus and divestiture of Cummins’ entire ownership and voting interest in Atmus (“Full-Separation”).

BASIS OF PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
BASIS OF PRESENTATION	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION As Atmus became a publicly traded company upon the IPO, its financial statements are now presented on a consolidated basis. In preparation for the IPO, the Company’s historical combined financial statements were prepared on a standalone basis, which reflected a combination of entities under common control that had been “carved out” of and derived from the historical consolidated financial statements and accounting records of Cummins. The unaudited financial statements for all periods presented, including the historical results of the Company prior to May 26, 2023, are now referred to as “Condensed Consolidated Financial Statements”, and have been prepared pursuant to the rules and regulations of the Commission for interim financial information . Accordingly, certain information and footnote disclosures normally included in annual financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) have been omitted. It is management’s opinion that these financial statements include all normal and recurring adjustments necessary for a fair statement of Atmus’ results of operations, financial position and cash flows. Results of operations for any interim period are not necessarily indicative of future or annual results. These interim statements should be read in conjunction with the audited financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023. Periods Prior to the IPO Prior to the IPO, Atmus, previously the Filtration Business of Cummins, functioned as part of the larger group of businesses controlled by Cummins and accordingly, utilized centralized functions of Cummins, such as facilities and information technology, to support its operations. A portion of the shared service costs were historically allocated to the Filtration Business. Cummins also performed certain corporate functions for the Filtration Business. The corporate expenses related to the Filtration Business were allocated from Cummins. These allocated costs primarily related to certain governance and corporate functions, including finance, human resources, investor relations, legal, tax, treasury and certain other costs. Where it was possible to specifically attribute such expenses to activities of the Filtration Business, these amounts were charged or credited directly to the Filtration Business without allocation or apportionment. Allocation of other such expenses was based on a reasonable reflection of the utilization of the service provided or benefit received by the Filtration Business for the periods presented prior to the Separation, on a consistent basis, such as a relative percentage of headcount and third-party sales. The aggregate costs allocated for these functions to the Filtration Business are included within the unaudited Condensed Consolidated Statements of Net Income for the periods presented prior to the Separation. Management believes these cost allocations were a reasonable reflection of the utilization of services provided to, or the benefit derived by, the Filtration Business during the period prior to the IPO, though the allocations may not be indicative of the actual costs that would have been incurred had the Filtration Business operated as a standalone public company. Actual costs that may have been incurred if the Filtration Business had been a standalone company would depend on a number of factors, including the chosen organizational structure, whether functions were outsourced or performed by the Filtration Business employees, and strategic decisions made in areas such as manufacturing, selling and marketing, research and development, information technology and infrastructure. Historically, Atmus’ cash was transferred to Cummins on a daily basis. This arrangement was not reflective of the manner in which Atmus would have been able to finance its operations had it been a standalone business separate from Cummins during each of the periods presented. Cummins’ debt and related interest expense were not allocated to Atmus for any of the periods presented since Atmus was not the legal obligor of the debt and Cummins’ borrowings were not directly attributable to Atmus. As the separate legal entities that made up the Filtration Business were not historically held by a single legal entity, Cummins’ net investment in this business (“Net Parent Investment”) was presented in lieu of a controlling interest’s equity in the Condensed Consolidated Financial Statements. For the Filtration Business, transactions with Cummins affiliates were included in the Condensed Consolidated Statements of Net Income and related balances were reflected as related party receivables and related party payables. Other balances between the Filtration Business and Cummins were considered to be effectively settled in the Condensed Consolidated Financial Statements at the time the transactions were recorded. As of the IPO Date In connection with the Separation, we entered into various agreements with Cummins, including a separation agreement. In the separation agreement, there were certain assets and liabilities identified in the schedules, including leases and unrecognized tax liabilities, which were retained by Cummins and were reflected as Net Parent Investment in the Company’s Condensed Consolidated Financial Statements, and those that were transferred to the Company, including additional pension assets, other compensation obligations and certain other assets and liabilities, which were transferred to the Company through Net Parent Investment in the Company’s Condensed Consolidated Financial Statements. These various agreements comprehensively provide a framework for our relationship with Cummins and govern various interim and ongoing relationships between us and Cummins post IPO. As part of the Separation, Net Parent Investment was reclassified as Additional Paid-in Capital. Periods Post IPO Following the IPO, certain services continue to be provided by Cummins under the transition services agreement. The Company incurred certain costs in its establishment as a standalone public company and expects to incur ongoing additional costs associated with operating as an independent, publicly traded company. As a standalone entity, the Company will file tax returns on its own behalf, and tax balances and effective income tax rates may differ from the amounts reported in the historical periods. Post IPO, Atmus filed a consolidated Federal income tax return and returns in certain other jurisdictions with Cummins. Post IPO, Retained earnings began to accumulate and the balance reflected on the Condensed Consolidated Balance Sheets reflects earnings for the period May 26, 2023 through March 31, 2024. Periods Post Full Separation Following Full Separation, Cummins will continue to provide certain services to Atmus under the transition services agreement. The transition services agreement relates primarily to administrative services, which are generally to be provided through May 2025. Atmus will continue to pay Cummins mutually agreed upon fees for these services. Post Full Separation, Cummins is no longer considered a related party and activity post March 18, 2024, between Atmus and Cummins has been treated as arm’s-length transactions. Atmus files tax returns in all jurisdictions on its own behalf post Full Separation.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Mar. 31, 2024
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Estimates and Judgments Preparation of financial statements requires management to make estimates and assumptions that affect reported amounts presented and disclosed in our interim Condensed Consolidated Financial Statements. Significant estimates and assumptions in these interim Condensed Consolidated Financial Statements require the exercise of judgment. Due to the inherent uncertainty involved in making estimates, actual results reported in future periods may be different from these estimates. Recent Accounting Pronouncements Net Yet Adopted Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. Additionally, it requires a public entity to disclose the title and position of the Chief Operating Decision Maker (“CODM”). The ASU does not change how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. The new standard is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. A public entity should apply the amendments in this ASU retrospectively to all prior periods presented in the financial statements. We expect this ASU to only impact our disclosures with no impacts to our results of operations, cash flows and financial condition. Income Taxes (Topic 740): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU No. 2023-09: Income Taxes (Topic 740): Improvements to Income Tax Disclosures that requires entities to disclose additional information about federal, state, and foreign income taxes primarily related to the income tax rate reconciliation and income taxes paid. The new standard also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. The guidance is effective for our fiscal year ending December 31, 2025, with early adoption permitted. The guidance does not affect recognition or measurement in our consolidated financial statements. We expect this ASU to only impact our disclosures with no impacts to our results of operations, cash flows and financial condition.

REVENUE FROM CONTRACTS WITH CUS

REVENUE FROM CONTRACTS WITH CUSTOMERS	3 Months Ended
REVENUE FROM CONTRACTS WITH CUSTOMERS	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS	REVENUE FROM CONTRACTS WITH CUSTOMERS Disaggregation of Revenue Revenue by Geographic Area The table below presents Atmus’ combined sales by geographic area. Net sales attributed to geographic areas were based on the location of the customer. For the Three Months Ended March 31, 2024 2023 (in millions) United States $ 201.0 $ 196.2 Other international 225.6 222.4 Total net sales $ 426.6 $ 418.6 Revenue by Product Category The table below presents Atmus’ combined sales by product category: For the Three Months Ended March 31, 2024 2023 (in millions) Fuel $ 187.2 $ 188.2 Lube 81.2 73.4 Air 71.8 72.1 Other 86.4 84.9 Total net sales $ 426.6 $ 418.6

EQUITY, ROYALTY AND INTEREST IN

EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES	3 Months Ended
EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES	Mar. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES	EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES Equity, royalty and interest income from investees, net of applicable taxes, was as follows: For the Three Months Ended March 31, 2024 2023 (in millions) Fleetguard Filters Pvt. Ltd. $ 7.6 $ 5.8 Shanghai Fleetguard Filter Co. Ltd 1.1 0.9 Filtrum Fibretechnologies Pvt. Ltd 0.1 0.1 Atmus share of net income 8.8 6.8 Royalty and interest income 1.6 1.6 Equity, royalty and interest income from investees $ 10.4 $ 8.4

INCOME TAXES

INCOME TAXES	3 Months Ended
INCOME TAXES	Mar. 31, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES In connection with the Separation, the Company entered into a tax matters agreement with Cummins that among other things, formalized our agreement related to the responsibility for historical tax positions for the period prior to the IPO for jurisdictions where our business was included in the consolidated or combined tax returns of Cummins. Atmus’ effective tax rate for the three months ended March 31, 2024 , was 22.0% . Atmus’ effective tax rate for the three months ended March 31, 2023 , was 23.7% . The decrease in the effective tax rate was driven by a change in the mix of earnings among tax jurisdictions and discrete tax items. The Company’s effective tax rate differs from the U.S. statutory rate primarily due to differences in rates applicable to foreign subsidiaries, withholding taxes and state income taxes. The Organization for Economic Co-operation and Development (“OECD”) introduced Base Erosion and Profit Shifting (“BEPS”) Pillar 2 rules that impose a global minimum tax rate of 15%. Numerous countries have enacted legislation that is effective on January 1, 2024. We have evaluated the impact of this legislation based on Atmus’ current global landscape and do not believe it will have a material impact. We will continue to update our analysis and monitor the ongoing legislation throughout the year.

INVENTORIES

INVENTORIES	3 Months Ended
INVENTORIES	Mar. 31, 2024
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories are stated at the lower of cost or net realizable value. Inventories included the following: March 31, December 31, (in millions) Finished products $ 197.3 $ 179.2 Work-in-process and raw materials 96.4 101.1 Inventories at FIFO cost 293.7 280.3 Excess of FIFO over LIFO (36.8) (30.3) Total inventories $ 256.9 $ 250.0

PRODUCT WARRANTY LIABILITY

PRODUCT WARRANTY LIABILITY	3 Months Ended
PRODUCT WARRANTY LIABILITY	Mar. 31, 2024
Product Warranties Disclosures [Abstract]
PRODUCT WARRANTY LIABILITY	PRODUCT WARRANTY LIABILITY A tabular reconciliation of the product warranty liability, including accrued product campaigns, was as follows: For the Three Months Ended March 31, 2024 2023 (in millions) Balance, beginning of year $ 14.0 $ 15.5 Provision for base warranties issued 2.2 3.0 Payments made during period (0.7) (1.3) Changes in estimates for pre-existing product warranties 0.3 (0.8) Balance, end of period $ 15.8 $ 16.4 Warranty liabilities included in Atmus’ Condensed Consolidated Balance Sheets were as follows: March 31, December 31, (in millions) Current portion $ 6.1 $ 5.4 Long-term portion 9.7 8.6 Total $ 15.8 $ 14.0

DEBT AND BORROWING ARRANGEMENTS

DEBT AND BORROWING ARRANGEMENTS	3 Months Ended
DEBT AND BORROWING ARRANGEMENTS	Mar. 31, 2024
Debt Disclosure [Abstract]
DEBT AND BORROWING ARRANGEMENTS	DEBT AND BORROWING ARRANGEMENTS Atmus entered into the Credit Agreement with Cummins and a syndicate of banks, providing for a "term loan” and a revolving credit facility, in anticipation of the Separation. Borrowings under the Credit Agreement did not become available under the Credit Agreement until the IPO occurred. The facilities covered by the Credit Agreement will mature on September 30, 2027. Upon completion of the IPO, we borrowed $650 million under the Credit Agreement, consisting of proceeds of the term loan and amounts drawn under the revolving credit facility, and paid such amounts to Cummins in partial consideration for the Separation. Borrowings under the Credit Agreement bear interest at varying rates, depending on the type of loan and, in some cases, the rates of designated benchmarks and the applicable election made. Generally, U.S. dollar-denominated loans bear interest at an adjusted term Secured Overnight Financing Rate (“SOFR”) (which includes a 0.1 percent credit spread adjustment to SOFR) for the applicable interest period plus a rate ranging from 1.125 percent to 1.75 percent depending on Atmus’ net leverage ratio. As of March 31, 2024, $600 million has been drawn on the term loan and no amount was drawn on the revolving credit facility. These amounts are included within Long-term debt and Current maturities of long-term debt on the Balance Sheet. As of March 31, 2024, Atmus’ fair value of Long-term debt was approximately $588 million, which was derived from Level 2 input measures. Our credit lines available as of March 31, 2024 and December 31, 2023 include: As of March 31, 2024 As of December 31, 2023 Facility Amount Borrowed Amount Facility Amount Borrowed Amount (in millions) Credit facilities: Term loan September 30, 2027 (1) $ 600.0 $ 600.0 600.0 600.0 Revolving credit facility September 30, 2027 (1) 400.0 — 400.0 — (1) Atmus maintains a term loan facility and a revolving credit facility as part of the Credit Agreement. The Credit Agreement includes financial covenants that Atmus maintain certain net leverage, secured net leverage and interest coverage ratios. At March 31, 2024, Atmus was in compliance with all financial covenants under the Credit Agreement. The Credit Agreement also contains customary representations, events of default and covenants, including restrictions on the level of borrowing. Over the next five years, aggregate principal maturities of our long-term debt are (in millions): 2024 2025 2026 2027 2028 Thereafter Total $ 7.5 $ 22.5 $ 30.0 $ 540.0 $ — $ — $ 600.0

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
COMMITMENTS AND CONTINGENCIES	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal Proceedings The Company is subject to lawsuits and claims arising out of the ordinary course of its business. The Company does not have any currently pending claims or litigation that the Company believes, individually or in the aggregate, will have a material adverse effect on its financial position, results of operations, cash flows, liquidity or capital resources. Atmus carries various forms of commercial, property and casualty, product liability and other forms of insurance; however, such insurance may not be applicable or adequate to cover the costs associated with a judgment against Atmus with respect to these lawsuits, claims and proceedings. While the Company believes it has established adequate accruals for our expected future liability with respect to pending lawsuits, claims and proceedings, where the nature and extent of any such liability can be reasonably estimated based upon presently available information, there can be no assurance that the final resolution of any existing or future lawsuits, claims or proceedings will not have a material adverse effect on Atmus’ business, results of operations, financial condition or cash flows. Indemnifications Periodically, Atmus enters various contractual arrangements where it agrees to indemnify a third-party against certain types of losses. Atmus regularly evaluates the probability of having to incur costs associated with these indemnities and accrue for expected losses that are probable. Because the indemnifications are not related to specified known liabilities, and due to their uncertain nature, Atmus is unable to estimate the maximum amount of the potential loss associated with these indemnifications.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE LOSS	3 Months Ended
ACCUMULATED OTHER COMPREHENSIVE LOSS	Mar. 31, 2024
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE LOSS	ACCUMULATED OTHER COMPREHENSIVE LOSS Following are the changes in Accumulated other comprehensive (loss) income by component for the three months ended March 31, 2024 and March 31, 2023 : For the Three Months Ended March 31, 2024 2023 (in millions) Currency translation adjustments: Balance at beginning of period $ (56.1) $ (56.7) Currency translation adjustments (6.8) 0.9 Other comprehensive (loss) income, net (6.8) 0.9 Balance at end of period (62.9) (55.8) Pensions and other benefit plans: Balance at beginning of period $ (0.1) $ 0.9 Change in pensions and other benefit plans — — Tax (expense)/benefit — — Other comprehensive income (loss), net — — Balance at end of period (0.1) 0.9 Accumulated other comprehensive loss: Balance at beginning of period $ (56.2) $ (55.8) Total other comprehensive (loss) income, net (6.8) 0.9 Balance at end of period $ (63.0) $ (54.9)

RELATIONSHIP WITH PARENT AND RE

RELATIONSHIP WITH PARENT AND RELATED PARTIES	3 Months Ended
RELATIONSHIP WITH PARENT AND RELATED PARTIES	Mar. 31, 2024
Related Party Transactions [Abstract]
RELATIONSHIP WITH PARENT AND RELATED PARTIES	RELATIONSHIP WITH PARENT AND RELATED PARTIES As described in Note 1, Description of the Business , prior to the IPO, Atmus had been managed and operated in the normal course of business with other subsidiaries of Cummins. Accordingly, certain shared costs prior to the IPO have been allocated to Atmus and reflected as expenses in the Condensed Consolidated Financial Statements. Management of Cummins and Atmus consider the allocation methodologies used to be reasonable and appropriate reflections of historical expenses of Cummins attributable to Atmus for purposes of the Condensed Consolidated Financial Statements; however, the expenses reflected in the Condensed Consolidated Financial Statements may not be indicative of the actual expenses that would have been incurred during the periods presented if Atmus historically operated as a separate, stand-alone entity. In addition, the expenses reflected in the Condensed Consolidated Financial Statements may not be indicative of expenses that will be incurred in the future by Atmus. The Company entered into the separation agreement and transition services agreement with Cummins, among other transaction agreements, all of which will govern the parties relationship following the IPO and full separation. This includes services provided by Cummins to the Company for a fixed term on a service-by-service basis. We will pay Cummins mutually agreed-upon fees for the services provided under the transition services agreement. Corporate Costs/Allocations The Condensed Consolidated Financial Statements include corporate costs incurred by Cummins for services that were provided to or on behalf of Atmus for the period prior to IPO. Such costs represent shared services and infrastructure provided by Cummins, including administrative, finance, human resources, information technology, legal, and other corporate and infrastructure services. The corporate costs reflected in the Condensed Consolidated Financial Statements consist of direct charges to the business and indirect allocations to Atmus. The costs that were directly charged to Atmus, such as the shared services for finance provided by Cummins Business Services, were primarily determined based on actual usage. Indirect allocations are related to shared services and infrastructure provided by Cummins that would benefit Atmus but were not directly charged to Atmus in a manner discussed above. These corporate costs were allocated to Atmus using methods management believes are consistent and reasonable. The primary allocation factor was third-party revenue; however, other relevant metrics were also utilized based on the nature of the underlying activities. For example, headcount was used as the allocation driver to allocate the human resource departmental costs. The expenses allocated and directly charged reflect all expenses that Cummins incurred on behalf of the Company. The expenses reflected in the Condensed Consolidated Financial Statements prior to the IPO may not be indicative of the actual expenses that would have been incurred during the period presented if Atmus historically operated as a separate, stand-alone entity. All corporate charges and allocations have been deemed paid by Atmus to Cummins in the period in which the cost was recognized in the Condensed Consolidated Statements of Income. Total corporate costs allocated to Atmus were zero for the three months ended March 31, 2024 compared with $8.2 million for the three months ended March 31, 2023. Allocated corporate costs are included in Net sales, Cost of sales, Selling, general and administrative expenses, Research, de velopment and engineering expenses and Other income, net. Post-IPO, Atmus has and will continue to incur its own corporate costs associated with being a standalone publicly traded company. Related Party Balances Following the full separation and as of March 31, 2024, Cummins is no longer considered a related party. Atmus had trade receivables of $37.9 million for products sold to, and accounts payable of $54.8 million for products and services purchased in the ordinary course from Cummins as of December 31, 2023 . Atmus’ sales to Cummins from January 1, 2024 through the date of full separation, March 18, 2024, were $65.4 million compared to $76.7 million for the three months ended March 31, 2023 .

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
EARNINGS PER SHARE	Mar. 31, 2024
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic and diluted earnings per share (“EPS”) were calculated as follows: For the Three Months Ended March 31, 2024 2023 (in millions, except per share data) Net income $ 45.5 $ 52.7 Weighted-average shares for basic EPS 83.3 83.3 Plus incremental shares from assumed conversions of long-term incentive plan shares 0.3 — Weighted-average shares for diluted EPS 83.6 83.3 Basic earnings per share $ 0.55 $ 0.63 Diluted earnings per share $ 0.54 $ 0.63 Basic and diluted earnings per share for the three months ended March 31, 2024 was calculated using the shares of common stock that were issued and outstanding as of the completion of the IPO. For the periods prior to the IPO, it is assumed that there were no dilutive equity instruments as there were no equity awards of Atmus outstanding prior to the IPO. Post-IPO, there were no anti-dilutive shares.

SUPPLEMENTAL BALANCE SHEET DATA

SUPPLEMENTAL BALANCE SHEET DATA	3 Months Ended
SUPPLEMENTAL BALANCE SHEET DATA	Mar. 31, 2024
Balance Sheet Related Disclosures [Abstract]
SUPPLEMENTAL BALANCE SHEET DATA	SUPPLEMENTAL BALANCE SHEET DATA Other assets included the following: March 31, December 31, (in millions) Operating lease assets $ 28.0 $ 24.8 Deferred income taxes 14.1 14.2 Long-term receivables 3.0 3.1 Other 10.4 9.4 Other assets $ 55.5 $ 51.5 Other accrued expenses included the following: March 31, December 31, (in millions) Marketing accruals $ 36.4 $ 42.6 Income taxes payable 14.0 10.3 Other taxes payables 8.9 12.7 Current portion of operating lease liabilities 7.3 7.1 Current portion of finance lease liabilities 0.4 0.3 Other 10.8 10.7 Other accrued expenses $ 77.8 $ 83.7 Other liabilities included the following: March 31, December 31, (in millions) Long-term portion of operating lease liabilities $ 21.4 $ 18.5 Deferred income taxes 1.4 1.4 Long-term income taxes 0.2 0.2 Other long-term liabilities 11.5 11.7 Other liabilities $ 34.5 $ 31.8

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
NET INCOME	$ 45.5	$ 52.7

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 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

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2024
Accounting Policies [Abstract]
Significant Accounting Estimates and Judgments	Significant Accounting Estimates and Judgments Preparation of financial statements requires management to make estimates and assumptions that affect reported amounts presented and disclosed in our interim Condensed Consolidated Financial Statements. Significant estimates and assumptions in these interim Condensed Consolidated Financial Statements require the exercise of judgment. Due to the inherent uncertainty involved in making estimates, actual results reported in future periods may be different from these estimates.
Recent Accounting Pronouncements Net Yet Adopted	Recent Accounting Pronouncements Net Yet Adopted Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually. Additionally, it requires a public entity to disclose the title and position of the Chief Operating Decision Maker (“CODM”). The ASU does not change how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. The new standard is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. A public entity should apply the amendments in this ASU retrospectively to all prior periods presented in the financial statements. We expect this ASU to only impact our disclosures with no impacts to our results of operations, cash flows and financial condition. Income Taxes (Topic 740): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU No. 2023-09: Income Taxes (Topic 740): Improvements to Income Tax Disclosures that requires entities to disclose additional information about federal, state, and foreign income taxes primarily related to the income tax rate reconciliation and income taxes paid. The new standard also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. The guidance is effective for our fiscal year ending December 31, 2025, with early adoption permitted. The guidance does not affect recognition or measurement in our consolidated financial statements. We expect this ASU to only impact our disclosures with no impacts to our results of operations, cash flows and financial condition.

REVENUE FROM CONTRACTS WITH C_2

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	3 Months Ended
REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Revenue by Geographic Area	The table below presents Atmus’ combined sales by geographic area. Net sales attributed to geographic areas were based on the location of the customer. For the Three Months Ended March 31, 2024 2023 (in millions) United States $ 201.0 $ 196.2 Other international 225.6 222.4 Total net sales $ 426.6 $ 418.6
Schedule of Revenue by Product Category	The table below presents Atmus’ combined sales by product category: For the Three Months Ended March 31, 2024 2023 (in millions) Fuel $ 187.2 $ 188.2 Lube 81.2 73.4 Air 71.8 72.1 Other 86.4 84.9 Total net sales $ 426.6 $ 418.6

EQUITY, ROYALTY AND INTEREST _2

EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES (Tables)	3 Months Ended
EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES (Tables)	Mar. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
Equity Royalty and Interest Income From Investees	Equity, royalty and interest income from investees, net of applicable taxes, was as follows: For the Three Months Ended March 31, 2024 2023 (in millions) Fleetguard Filters Pvt. Ltd. $ 7.6 $ 5.8 Shanghai Fleetguard Filter Co. Ltd 1.1 0.9 Filtrum Fibretechnologies Pvt. Ltd 0.1 0.1 Atmus share of net income 8.8 6.8 Royalty and interest income 1.6 1.6 Equity, royalty and interest income from investees $ 10.4 $ 8.4

INVENTORIES (Tables)

INVENTORIES (Tables)	3 Months Ended
INVENTORIES (Tables)	Mar. 31, 2024
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories are stated at the lower of cost or net realizable value. Inventories included the following: March 31, December 31, (in millions) Finished products $ 197.3 $ 179.2 Work-in-process and raw materials 96.4 101.1 Inventories at FIFO cost 293.7 280.3 Excess of FIFO over LIFO (36.8) (30.3) Total inventories $ 256.9 $ 250.0

PRODUCT WARRANTY LIABILITY (Tab

PRODUCT WARRANTY LIABILITY (Tables)	3 Months Ended
PRODUCT WARRANTY LIABILITY (Tables)	Mar. 31, 2024
Product Warranties Disclosures [Abstract]
Summary of Activity in Product Warranty Account	A tabular reconciliation of the product warranty liability, including accrued product campaigns, was as follows: For the Three Months Ended March 31, 2024 2023 (in millions) Balance, beginning of year $ 14.0 $ 15.5 Provision for base warranties issued 2.2 3.0 Payments made during period (0.7) (1.3) Changes in estimates for pre-existing product warranties 0.3 (0.8) Balance, end of period $ 15.8 $ 16.4 Warranty liabilities included in Atmus’ Condensed Consolidated Balance Sheets were as follows: March 31, December 31, (in millions) Current portion $ 6.1 $ 5.4 Long-term portion 9.7 8.6 Total $ 15.8 $ 14.0

DEBT AND BORROWING ARRANGEMEN_2

DEBT AND BORROWING ARRANGEMENTS (Tables)	3 Months Ended
DEBT AND BORROWING ARRANGEMENTS (Tables)	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Credit Lines Available	Our credit lines available as of March 31, 2024 and December 31, 2023 include: As of March 31, 2024 As of December 31, 2023 Facility Amount Borrowed Amount Facility Amount Borrowed Amount (in millions) Credit facilities: Term loan September 30, 2027 (1) $ 600.0 $ 600.0 600.0 600.0 Revolving credit facility September 30, 2027 (1) 400.0 — 400.0 — (1) Atmus maintains a term loan facility and a revolving credit facility as part of the Credit Agreement. The Credit Agreement includes financial covenants that Atmus maintain certain net leverage, secured net leverage and interest coverage ratios. At March 31, 2024, Atmus was in compliance with all financial covenants under the Credit Agreement. The Credit Agreement also contains customary representations, events of default and covenants, including restrictions on the level of borrowing.
Schedule of Aggregate Principal Maturities of Long-Term Debt	Over the next five years, aggregate principal maturities of our long-term debt are (in millions): 2024 2025 2026 2027 2028 Thereafter Total $ 7.5 $ 22.5 $ 30.0 $ 540.0 $ — $ — $ 600.0

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	3 Months Ended
ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	Mar. 31, 2024
Equity [Abstract]
Schedule of Changes In Accumulated Other Comprehensive Loss By Component	Following are the changes in Accumulated other comprehensive (loss) income by component for the three months ended March 31, 2024 and March 31, 2023 : For the Three Months Ended March 31, 2024 2023 (in millions) Currency translation adjustments: Balance at beginning of period $ (56.1) $ (56.7) Currency translation adjustments (6.8) 0.9 Other comprehensive (loss) income, net (6.8) 0.9 Balance at end of period (62.9) (55.8) Pensions and other benefit plans: Balance at beginning of period $ (0.1) $ 0.9 Change in pensions and other benefit plans — — Tax (expense)/benefit — — Other comprehensive income (loss), net — — Balance at end of period (0.1) 0.9 Accumulated other comprehensive loss: Balance at beginning of period $ (56.2) $ (55.8) Total other comprehensive (loss) income, net (6.8) 0.9 Balance at end of period $ (63.0) $ (54.9)

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
EARNINGS PER SHARE (Tables)	Mar. 31, 2024
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings per Share	Basic and diluted earnings per share (“EPS”) were calculated as follows: For the Three Months Ended March 31, 2024 2023 (in millions, except per share data) Net income $ 45.5 $ 52.7 Weighted-average shares for basic EPS 83.3 83.3 Plus incremental shares from assumed conversions of long-term incentive plan shares 0.3 — Weighted-average shares for diluted EPS 83.6 83.3 Basic earnings per share $ 0.55 $ 0.63 Diluted earnings per share $ 0.54 $ 0.63

SUPPLEMENTAL BALANCE SHEET DA_2

SUPPLEMENTAL BALANCE SHEET DATA (Tables)	3 Months Ended
SUPPLEMENTAL BALANCE SHEET DATA (Tables)	Mar. 31, 2024
Balance Sheet Related Disclosures [Abstract]
Schedule of Other Assets	Other assets included the following: March 31, December 31, (in millions) Operating lease assets $ 28.0 $ 24.8 Deferred income taxes 14.1 14.2 Long-term receivables 3.0 3.1 Other 10.4 9.4 Other assets $ 55.5 $ 51.5
Schedule of Other Accrued Expenses	Other accrued expenses included the following: March 31, December 31, (in millions) Marketing accruals $ 36.4 $ 42.6 Income taxes payable 14.0 10.3 Other taxes payables 8.9 12.7 Current portion of operating lease liabilities 7.3 7.1 Current portion of finance lease liabilities 0.4 0.3 Other 10.8 10.7 Other accrued expenses $ 77.8 $ 83.7
Schedule of Other Liabilities	Other liabilities included the following: March 31, December 31, (in millions) Long-term portion of operating lease liabilities $ 21.4 $ 18.5 Deferred income taxes 1.4 1.4 Long-term income taxes 0.2 0.2 Other long-term liabilities 11.5 11.7 Other liabilities $ 34.5 $ 31.8

DESCRIPTION OF THE BUSINESS (De

DESCRIPTION OF THE BUSINESS (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
	May 30, 2023	May 26, 2023	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2022
First-Fit Sales \| Revenue Benchmark \| Product Concentration Risk
Description of Business [Line Items]
Net sales estimate				19%
Aftermarket Sales \| Revenue Benchmark \| Product Concentration Risk
Description of Business [Line Items]
Net sales estimate				81%
Atmus Filtration Technologies Inc. And Subsidiaries \| Cummins Filtration, Inc.
Description of Business [Line Items]
Ownership percentage	80.50%
IPO \| Cummins Filtration, Inc.
Description of Business [Line Items]
Number of shares issued in transaction (in shares)		16,243,070
Over-Allotment Option \| Cummins Filtration, Inc.
Description of Business [Line Items]
Number of shares issued in transaction (in shares)		2,118,661
Revolving Credit Facility \| Atmus Credit Agreement \| Line of Credit
Description of Business [Line Items]
Facility Amount					$ 1,000
Borrowed Amount	$ 650
Revolving Credit Facility \| Atmus Term Loan Facility \| Line of Credit
Description of Business [Line Items]
Facility Amount			$ 600	$ 600	600
Borrowed Amount			600
Revolving Credit Facility \| Atmus Revolving Credit Facility \| Line of Credit
Description of Business [Line Items]
Facility Amount			400	$ 400	$ 400
Borrowed Amount			$ 0

REVENUE FROM CONTRACTS WITH C_3

REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Net sales	[1]	$ 426.6	$ 418.6
Fuel
Disaggregation of Revenue [Line Items]
Net sales		187.2	188.2
Lube
Disaggregation of Revenue [Line Items]
Net sales		81.2	73.4
Air
Disaggregation of Revenue [Line Items]
Net sales		71.8	72.1
Other
Disaggregation of Revenue [Line Items]
Net sales		86.4	84.9
United States
Disaggregation of Revenue [Line Items]
Net sales		201	196.2
Other international
Disaggregation of Revenue [Line Items]
Net sales		$ 225.6	$ 222.4

[1] Includes sales to related parties of $82.3 million for the three months ended March 31, 2024 compared with $89.1 million for the three months ended March 31, 2023.

EQUITY, ROYALTY AND INTEREST _3

EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	$ 8.8	$ 6.8
Royalty and interest income	1.6	1.6
Equity, royalty and interest income from investees	10.4	8.4
Fleetguard Filters Pvt. Ltd.
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	7.6	5.8
Shanghai Fleetguard Filter Co. Ltd
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	1.1	0.9
Filtrum Fibretechnologies Pvt. Ltd
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	$ 0.1	$ 0.1

INCOME TAXES (Details)

INCOME TAXES (Details)	3 Months Ended
INCOME TAXES (Details)	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Effective tax rate	22%	23.70%

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Finished products	$ 197.3	$ 179.2
Work-in-process and raw materials	96.4	101.1
Inventories at FIFO cost	293.7	280.3
Excess of FIFO over LIFO	(36.8)	(30.3)
Total inventories	$ 256.9	$ 250

PRODUCT WARRANTY LIABILITY - Pr

PRODUCT WARRANTY LIABILITY - Product Warranty Account (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of year	$ 14	$ 15.5
Provision for base warranties issued	2.2	3
Payments made during period	(0.7)	(1.3)
Changes in estimates for pre-existing product warranties	0.3	(0.8)
Balance, end of period	$ 15.8	$ 16.4

PRODUCT WARRANTY LIABILITY - Wa

PRODUCT WARRANTY LIABILITY - Warranty Liability (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Product Warranties Disclosures [Abstract]
Current portion	$ 6.1	$ 5.4
Long-term portion	9.7	8.6
Total	$ 15.8	$ 14

DEBT AND BORROWING ARRANGEMEN_3

DEBT AND BORROWING ARRANGEMENTS - Narrative (Details) - USD ($) $ in Millions			3 Months Ended
	May 30, 2023	May 26, 2023	Mar. 31, 2024
Line of Credit Facility [Line Items]
Long-term debt fair value			$ 588
Revolving Credit Facility \| Atmus Credit Agreement \| Line of Credit
Line of Credit Facility [Line Items]
Long-term debt proceeds		$ 650
Borrowed Amount	$ 650
Revolving Credit Facility \| Atmus Credit Agreement \| Line of Credit \| Secured Overnight Financing Rate \| Variable Rate Component One
Line of Credit Facility [Line Items]
Interest rate			0.10%
Revolving Credit Facility \| Atmus Credit Agreement \| Line of Credit \| Secured Overnight Financing Rate \| Minimum \| Variable Rate Component Two
Line of Credit Facility [Line Items]
Interest rate			1.125%
Revolving Credit Facility \| Atmus Credit Agreement \| Line of Credit \| Secured Overnight Financing Rate \| Maximum \| Variable Rate Component Two
Line of Credit Facility [Line Items]
Interest rate			1.75%
Revolving Credit Facility \| Atmus Term Loan Facility \| Line of Credit
Line of Credit Facility [Line Items]
Borrowed Amount			$ 600
Revolving Credit Facility \| Atmus Revolving Credit Facility \| Line of Credit
Line of Credit Facility [Line Items]
Borrowed Amount			$ 0

DEBT AND BORROWING ARRANGEMEN_4

DEBT AND BORROWING ARRANGEMENTS - Schedule of Credit Lines Available (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2022
Line of Credit Facility [Line Items]
Borrowed Amount	$ 600
Revolving Credit Facility \| Atmus Credit Agreement \| Line of Credit
Line of Credit Facility [Line Items]
Facility Amount			$ 1,000
Revolving Credit Facility \| Atmus Term Loan Facility \| Line of Credit
Line of Credit Facility [Line Items]
Facility Amount	600	$ 600	600
Borrowed Amount	600	600
Revolving Credit Facility \| Atmus Revolving Credit Facility \| Line of Credit
Line of Credit Facility [Line Items]
Facility Amount	400	400	$ 400
Borrowed Amount	$ 0	$ 0

DEBT AND BORROWING ARRANGEMEN_5

DEBT AND BORROWING ARRANGEMENTS - Schedule of Long Term Debt (Details) $ in Millions	Mar. 31, 2024 USD ($)
Debt Disclosure [Abstract]
2024	$ 7.5
2025	22.5
2026	30
2027	540
2028	0
Thereafter	0
Total	$ 600

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 80.7	$ 455.6
Total other comprehensive (loss) income, net	(6.8)	0.9
Ending Balance	121.8	472.8
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(56.2)	(55.8)
Total other comprehensive (loss) income, net	(6.8)	0.9
Ending Balance	(63)	(54.9)
Currency translation adjustments:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(56.1)	(56.7)
Total other comprehensive (loss) income, net	(6.8)	0.9
Ending Balance	(62.9)	(55.8)
Pensions and other benefit plans:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(0.1)	0.9
Change in pensions and other benefit plans	0	0
Tax (expense)/benefit	0	0
Total other comprehensive (loss) income, net	0	0
Ending Balance	$ (0.1)	$ 0.9

RELATIONSHIP WITH PARENT AND _2

RELATIONSHIP WITH PARENT AND RELATED PARTIES (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 18, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Allocated corporate costs		$ 0		$ 8.2
Net sales	[1]	$ 426.6		418.6
Related Party
Related Party Transaction [Line Items]
Related party receivables					$ 37.9
Accounts payable					$ 54.8
Net sales			$ 65.4	$ 76.7

[1] Includes sales to related parties of $82.3 million for the three months ended March 31, 2024 compared with $89.1 million for the three months ended March 31, 2023.

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 45.5	$ 52.7
Weighted-average shares for basic EPS (in shares)	83,300,000	83,300,000
Plus incremental shares from assumed conversions of long-term incentive plan shares (in shares)	300,000	0
Weighted-average shares for diluted EPS (in shares)	83,600,000	83,300,000
Basic earnings per share (in dollars per share)	$ 0.55	$ 0.63
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.63
Anti-dilutive shares (in shares)	0	0

SUPPLEMENTAL BALANCE SHEET DA_3

SUPPLEMENTAL BALANCE SHEET DATA - Schedule of Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Operating lease assets	$ 28	$ 24.8
Deferred income taxes	14.1	14.2
Long-term receivables	3	3.1
Other	10.4	9.4
Other assets	$ 55.5	$ 51.5
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets

SUPPLEMENTAL BALANCE SHEET DA_4

SUPPLEMENTAL BALANCE SHEET DATA - Schedule of Other Accrued Expenses (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Marketing accruals	$ 36.4	$ 42.6
Income taxes payable	14	10.3
Other taxes payables	8.9	12.7
Current portion of operating lease liabilities	7.3	7.1
Current portion of finance lease liabilities	0.4	0.3
Other	10.8	10.7
Other accrued expenses	$ 77.8	$ 83.7

SUPPLEMENTAL BALANCE SHEET DA_5

SUPPLEMENTAL BALANCE SHEET DATA - Schedule of Other Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Long-term portion of operating lease liabilities	$ 21.4	$ 18.5
Deferred income taxes	1.4	1.4
Long-term income taxes	0.2	0.2
Other long-term liabilities	11.5	11.7
Other liabilities	$ 34.5	$ 31.8