INCOME TAXES Income Taxes (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2015 subsidiary	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Income Taxes [Line Items]
Number Of Subsidiaries Acquired | subsidiary			2
Current income tax expense	$ 0.2	$ 0.0		$ 0.1	$ 0.0
Deferred income tax benefit	(2.2)	(0.8)		(7.5)	(5.5)
Total income tax benefit	$ (2.0)	$ (0.8)		$ (7.4)	$ (5.5)