INCOME TAXES (Components of Income Tax (Benefit) Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current income tax expense	$ 0.5	$ 0.8	$ 1.7
Deferred income tax (benefit) expense	(8.8)	7.2	(12.5)
Total income tax (benefit) expense	$ (8.3)	$ 8.0	$ (10.8)