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Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current      
Federal $ 42.8 $ 31.2 $ 1.3
State 8.5 3.8 0.7
Current Income Tax Expense (Benefit) 51.3 34.9 2.0
Deferred      
Federal (13.1) (7.6) (8.8)
State (1.8) (0.3) (0.9)
Deferred tax expense (14.9) (7.9) (9.7)
Income tax provision 36.4 27.0 (7.7)
Income Tax Examination [Line Items]      
Federal 42.8 31.2 1.3
State 8.5 3.8 0.7
Current Income Tax Expense (Benefit) 51.3 34.9 2.0
Federal (13.1) (7.6) (8.8)
State (1.8) (0.3) (0.9)
Deferred taxes (14.9) (7.9) (9.7)
Income tax (provision) benefit 36.4 $ 27.0 $ (7.7)
Valuation allowances, State Tax Credits [Member]      
Income Tax Examination [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 2.9