INCOME TAXES Income Taxes (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) subsidiary	Sep. 30, 2020 USD ($)
Income Tax Disclosure [Abstract]
Number Of Subsidiaries Acquired | subsidiary			2
Current income tax benefit	$ (0.2)	$ 0.0	$ (1.3)	$ 0.0
Deferred income tax (benefit) expense	(1.8)	(1.2)	(15.6)	8.6
Total income tax (benefit) expense	$ (2.0)	$ (1.2)	$ (16.9)	$ 8.6