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Nature of Operations and Significant Accounting Policies - Re-cohorting Impacts To Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase to income before taxes      
Cost of reinsurance amortization $ (631.6) $ (17.7) $ (19.3)
Income (loss) before income taxes $ 1,889.6 $ 738.8 5,987.0
Adjustment related to actuarial balance re-cohorting      
Increase to income before taxes      
Cost of reinsurance amortization     33.7
Change in additional liability for certain benefit features     167.4
Income (loss) before income taxes     201.1
Increase to pre-tax other comprehensive income      
Cost of reinsurance unrealized gains (losses)     (2.1)
Change in additional liability for certain benefit features unrealized gains     7.8
Total increase to pre-tax other comprehensive income     5.7
Total increase to pre-tax comprehensive income     $ 206.8