INCOME TAXES - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Current
Federal	$ 0.4	$ 4.1
State	0.4	0.3
Total current income tax expense	0.8	4.4
Deferred
Federal	49.5	(62.5)
State	9.0	(13.9)
Total deferred income tax provision (benefit)	58.5	(76.4)
Income tax provision (benefit)	$ 59.3	$ (72.0)