INCOME TAXES - (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current federal	$ 12.5	$ 2.6	$ 0.7
Current state	2.1	2.4	1.1
Current foreign	0.1	0.0	0.1
Total current	14.7	5.0	1.9
Deferred federal	1.1	7.7	(18.3)
Deferred state	0.3	0.6	(3.6)
Deferred foreign	0.0	0.1	0.0
Total deferred	1.4	8.4	(21.9)
Income tax	$ 16.1	$ 13.4	$ (20.0)