INCOME TAXES - (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 16.8	$ 17.0	$ 12.5
State	3.8	3.3	2.1
Foreign	0.1	0.1	0.1
Total current	20.7	20.4	14.7
Deferred:
Federal	(0.6)	(0.8)	1.1
State	(0.2)	0.3	0.3
Foreign	(2.4)	0.0	0.0
Total deferred	(3.2)	(0.5)	1.4
Income tax	$ 17.5	$ 19.9	$ 16.1