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INCOME TAXES - Schedule of Income Tax Benefit (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
Federal $ 3.4 $ (0.5) $ (1.9)
State 1.8 1.9 3.6
Foreign 0.2 0.5 0.1
Total current 5.4 1.9 1.8
Deferred:      
Federal (51.8) (25.8) (33.7)
State (5.2) (4.8) 5.1
Foreign 0.1 (2.9) 0.1
Change in valuation allowance 52.6 3.0 (3.2)
Total deferred (4.3) (30.5) (31.7)
Total income tax expense (benefit) $ 1.1 $ (28.6) $ (29.9)