INCOME TAXES Income Taxes (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) subsidiary	Jun. 30, 2020 USD ($)
Income Tax Disclosure [Abstract]
Number Of Subsidiaries Acquired | subsidiary			2
Current income tax expense (benefit)	$ 0.1	$ 0.0	$ (1.1)	$ 0.0
Deferred income tax (benefit) expense	(4.4)	(4.4)	(13.8)	9.8
Total income tax (benefit) expense	$ (4.3)	$ (4.4)	$ (14.9)	$ 9.8