INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits
Balance at beginning of the period	$ 25.1	$ 19.2	$ 18.3
Tax position changes in current year	3.6	5.8	2.3
Tax position changes in prior years	(0.1)		(1.2)
Tax position changes in prior years		0.3
Reductions for lapse of statute of limitations	(0.2)	(0.2)	(0.2)
Balance at the end of the period	28.4	25.1	$ 19.2
Unrecognized tax benefits that, if recognized, would impact the effective rate	24.2
Interest accrued related to unrecognized tax benefits	0.9	0.2
Accrued for a tax position claimed	1.5	$ 1.2
Income taxes related to interest	0.7
Income taxes related to penalties	$ 0.8