INCOME TAX - (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 18.1	$ 21.2	$ 16.8
State	4.2	4.3	3.8
Foreign	0.2	0.2	0.1
Total current	22.5	25.7	20.7
Deferred:
Federal	0.9	0.0	(0.6)
State	0.2	0.1	(0.2)
Foreign	0.9	(0.1)	(2.4)
Total deferred	2.0	0.0	(3.2)
Income tax	$ 24.5	$ 25.7	$ 17.5