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Income Taxes - Income Tax (Benefit) Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ (0.2) $ (0.2) $ (0.3)
State 1.9 1.7 1.5
Deferred:      
Federal (22.2) 3.2 16.5
State 0.4 4.8 8.7
Total income tax (benefit) expense $ (20.1) $ 9.5 $ 26.4