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Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
CARES Act Tax Benefit $ 7.0    
Current      
Federal (17.4) $ (2.1) $ 1.1
State 1.8 0.1 2.1
Current Income Tax Expense (Benefit) (15.6) (2.0) 3.2
Deferred      
Federal 32.5 (0.6) 3.6
State 4.2 0.3 3.5
Deferred tax expense 36.7 (0.3) 7.1
Income tax provision 21.1 (2.3) 10.3
Income Tax Examination [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (0.1) $ (2.3) $ 0.0