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Income Taxes - Provision (Benefit) for Income Taxes (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
Current                      
Federal                 $ (73.9) $ 17.4 $ 19.8
State                 (1.1) 3.0 1.9
Current Income Tax Expense (Benefit)                 (75.0) 20.5 21.7
Deferred                      
Federal                 50.9 (3.7) 3.2
State                 (3.0) 0.1 4.3
Deferred tax expense                 47.9 (3.6) 7.5
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
Income Tax Examination [Line Items]                      
Federal                 (73.9) 17.4 19.8
State                 (1.1) 3.0 1.9
Current Income Tax Expense (Benefit)                 (75.0) 20.5 21.7
Federal                 50.9 (3.7) 3.2
State                 (3.0) 0.1 4.3
Deferred taxes                 47.9 (3.6) 7.5
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
Valuation allowances, State Tax Credits [Member]                      
Income Tax Examination [Line Items]                      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount                 $ 2.6