INCOME TAXES Income Taxes (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) subsidiary	Mar. 31, 2019 USD ($)
Income Taxes [Line Items]
Number Of Subsidiaries Acquired | subsidiary	2
Current income tax expense	$ 0.0	$ 0.0
Deferred income tax expense (benefit)	14.2	(7.2)
Total income tax expense (benefit)	$ 14.2	$ (7.2)