EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	$ 6.7	$ 6.0	$ 20.3	$ 17.4
Royalty and interest income	1.4	1.3	4.5	4.1
Equity, royalty and interest income from investees	8.1	7.3	24.8	21.5
Shanghai Fleetguard Filter Co. Ltd
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	1.2	2.1	3.8	3.9
Fleetguard Filters Pvt. Ltd.
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	5.5	3.8	16.3	13.3
Filtrum Fibretechnologies Pvt. Ltd
Schedule of Equity Method Investments [Line Items]
Atmus share of net income	$ 0.0	$ 0.1	$ 0.2	$ 0.2