INVESTMENTS IN EQUITY INVESTEES - Equity, Royalty and Interest Income From Investees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	$ 28.1	$ 27.6	$ 22.7
Royalty and interest income	6.2	6.0	5.3
Equity, royalty and interest income from investees	34.3	33.6	28.0
Shanghai Fleetguard Filter Co. Ltd
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	5.9	5.9	5.3
Fleetguard Filters Pvt. Ltd.
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	21.8	21.5	17.1
Filtrum Fibretechnologies Pvt. Ltd
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	$ 0.4	$ 0.2	$ 0.3