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EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	$ 6.9	$ 6.6	$ 20.5	$ 22.0
Royalty and interest income	1.5	1.5	4.6	4.7
Equity, royalty and interest income from investees	8.4	8.1	25.1	26.7
Fleetguard Filters Pvt. Ltd.
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	5.1	5.3	15.6	17.5
Shanghai Fleetguard Filter Co. Ltd
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	1.7	1.2	4.6	4.2
Filtrum Fibretechnologies Pvt. Ltd
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	$ 0.1	$ 0.1	$ 0.3	$ 0.3

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