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Income Taxes - Income Tax Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]                      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent                 4.50% 4.00% 3.90%
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Percent                 0.10% (0.20%) (5.70%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent                 3.00% (1.60%) 9.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent                 (0.70%) 1.90% 1.90%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent                 (0.40%) (1.10%) 5.10%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent                 (0.60%) (1.50%) 0.80%
Effective Income Tax Rate Reconciliation, Percent                 26.80% 25.80% 35.50%
Income tax provision $ (9.7) $ (3.3) $ (14.6) $ 0.5 $ 0.2 $ 3.7 $ 4.3 $ 8.7 $ (27.1) $ 16.9 $ 29.2
Computed expected tax provision                 (21.2) 13.8 17.2
State and local taxes, net of federal income tax impact                 (4.5) 2.6 3.2
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount                 0.7 1.3 1.6
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount                 0.4 (0.7) 4.2
Other                 $ 0.6 $ 1.0 $ 0.6
Effective Income Tax Rate Reconciliation, Percent                 26.80% 25.80% 35.50%
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Amount                 $ (0.1) $ (0.2) $ (4.7)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount                 $ 3.0 $ 1.0 $ 7.5
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent                 (0.60%) (1.50%) 0.80%
Income tax provision $ (9.7) $ (3.3) $ (14.6) $ 0.5 $ 0.2 $ 3.7 $ 4.3 $ 8.7 $ (27.1) $ 16.9 $ 29.2
Uncertain tax provision                      
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount                 $ (0.1) $ (2.2) $ (0.6)
Uncertain tax provision                      
Income Tax Disclosure [Abstract]                      
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction                 (0.10%) 3.30% (0.70%)
Effective Income Tax Rate Reconciliation, Worthless Stock Deduction                 (0.10%) 3.30% (0.70%)