INCOME TAXES - Reconciliation Between Income Tax Expense and Computed Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax at Federal statutory rate	$ 24.8	$ 9.1	$ (4.1)
Foreign taxes at rates different from the U.S. rate	1.1	0.8	1.4
State and local income taxes, net of federal tax benefit	5.0	(0.7)	(1.4)
Impact of state rate changes	0.3	1.4	0.7
Changes in valuation allowances	(21.7)	(1.2)	15.9
Reversal of valuation allowances	(29.4)	0.0	0.0
2017 TCJA, net deferred tax remeasurment and repatriation tax impacts	15.7	0.0	0.0
Non-deductible items	(0.4)	(0.3)	0.0
Other items, net	(0.7)	0.1	(0.2)
Income tax	$ (5.3)	$ 9.2	$ 12.3
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax at Federal statutory rate	35.00%	35.00%	35.00%
Foreign taxes at rates different from the U.S. rate	1.60%	3.10%	(12.00%)
State and local income taxes, net of federal tax benefit	7.10%	(2.70%)	12.00%
Impact of state rate changes	0.50%	5.30%	(6.00%)
Changes in valuation allowances	(30.70%)	(4.60%)	(135.80%)
Other items, net	(41.50%)	0.00%	0.00%
2017 TCJA, net deferred tax remeasurment and repatriation tax impacts	22.10%	0.00%	0.00%
Non-deductible items	(0.60%)	(1.20%)	0.00%
Other items, net	(1.00%)	0.40%	1.70%
Income tax	(7.50%)	35.30%	(105.10%)