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Nature of Operations and Significant Accounting Policies - Pre-tax Impacts To Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Increase to income before taxes      
Deferred acquisition costs amortization $ (389.8) $ (386.9) $ (373.4)
Cost of reinsurance amortization (17.7) (19.3) (23.0)
Income (loss) before income taxes $ 738.8 5,987.0 $ 1,910.9
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