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Income Taxes - Components of Federal and State Income Tax Provisions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income tax (expense) benefit:      
Current expense (benefit) $ (15.4) $ 0.0 $ 0.0
Deferred expense (benefit) (232.7) (87.9) 5.5
Total income tax expense (benefit) $ (248.1) $ (87.9) $ 5.5