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Income Taxes - Income Tax Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 4.00% 3.30% (0.50%)
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Percent (0.60%) (7.80%) 1.20%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (0.90%) 10.10% (0.20%)
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction (7.30%) (93.60%) 0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.90% 2.20% (0.60%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent (0.10%) 8.10% 0.10%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent (0.70%) 0.80% 0.20%
Effective Income Tax Rate Reconciliation, Percent 25.30% 37.00% 21.60%
Income tax (provision) benefit $ 36.4 $ 27.0 $ (7.7)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction (7.30%) (93.60%) 0.00%
Computed expected tax provision $ 30.3 $ 15.3 $ (7.5)
State and local taxes, net of federal income tax impact 5.8 2.4 0.2
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount (10.5) (68.4) 0.0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 1.3 1.6 0.2
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (0.1) 5.9 0.0
Other $ (1.0) $ 0.6 $ (0.1)
Effective Income Tax Rate Reconciliation, Percent 25.30% 37.00% 21.60%
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Amount $ (0.8) $ (5.7) $ (0.4)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ 1.3 $ 7.4 $ 0.1
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent (0.70%) 0.80% 0.20%
Income tax (provision) benefit $ 36.4 $ 27.0 $ (7.7)
Uncertain tax provision      
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount $ (2.2) $ (0.6) $ (0.2)
Uncertain tax provision      
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction 7.30% 93.60% 0.00%
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction 7.30% 93.60% 0.00%
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount $ (10.5) $ (68.4) $ 0.0
Uncertain tax provision      
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction 1.50% (0.80%) 0.50%
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction 1.50% (0.80%) 0.50%