INCOME TAXES - Valuation Allowance (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Valuation Allowance [Roll Forward]
Balance at beginning of year	$ 16.4	$ 17.6	$ 16.0
Additions charged to tax expense	0.1	0.4	2.1
Valuation allowance reversal	0.0	(1.6)	(0.5)
Other	(12.8)	0.0	0.0
Balance at end of year	$ 3.7	$ 16.4	$ 17.6