INCOME TAXES Income Taxes (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2015 subsidiary	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Income Taxes [Line Items]
Number Of Subsidiaries Acquired | subsidiary			2
Current income tax benefit	$ (0.1)	$ 0.0		$ (0.1)	$ 0.0
Deferred income tax expense (benefit)	1.9	(4.0)		(5.3)	(4.7)
Total income tax expense (benefit)	$ 1.8	$ (4.0)		$ (5.4)	$ (4.7)