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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current:      
Federal $ 0.0 $ 0.0 $ (0.2)
State 1.5 1.5 1.9
Deferred:      
Federal 17.5 7.9 (22.2)
State 4.3 1.1 0.4
Total income tax expense (benefit) $ 23.3 $ 10.5 $ (20.1)