INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount
Tax expense at statutory rate	$ 6.0	$ 10.1	$ 13.5
Rates different from statutory	(1.3)	(0.9)	2.3
Statutory income tax change	0.0	2.1	(7.6)
State income taxes	1.5	0.8	3.5
Nondeductible items	1.3	1.3	3.1
GILTI inclusion	0.2	1.1	0.0
Unrecognized tax benefit relating to Warrants	0.0	0.0	0.3
Valuation allowance	5.8	4.7	(2.5)
Unrecognized tax benefit	(0.1)	(2.2)	0.0
Other	(1.1)	(0.2)	(0.2)
Income tax expense on continuing operations	$ 12.3	$ 16.8	$ 12.4
Effective Income Tax Rate Reconciliation, Percent
Tax expense (benefit) at statutory rate (percentage)	21.00%	21.00%	35.00%
Rates different from statutory (percentage)	(4.50%)	(1.90%)	5.90%
Statutory income tax change (percentage)	0.00%	4.40%	(19.60%)
State income taxes (percentage)	5.20%	1.70%	9.10%
Nondeductible items (percentage)	4.50%	2.70%	7.90%
GILTI inclusion (percentage)	0.70%	2.30%	0.00%
Unrecognized tax benefit relating to Warrants (percentage)	0.00%	0.00%	0.70%
Valuation allowance (percentage)	20.30%	9.80%	(6.60%)
Unrecognized tax benefit (percentage)	(0.40%)	(4.70%)	0.00%
Other (percentage)	(3.80%)	(0.40%)	(0.50%)
Income tax expense on continuing operations (percentage)	43.00%	34.90%	31.90%