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Nature of Operations and Significant Accounting Policies - Pre-tax Impacts To Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Increase to income before taxes        
Cost of reinsurance amortization $ (15.4) $ (0.5) $ (33.2) $ (5.0)
Income (loss) before income taxes $ 453.6 3,970.6 $ 241.1 4,349.0
Adjustment related to actuarial balance re-cohorting        
Increase to income before taxes        
Cost of reinsurance amortization   (33.7)   33.7
Change in additional liability for certain benefit features   167.4   167.4
Income (loss) before income taxes   201.1   201.1
Increase to pre-tax other comprehensive income        
Cost of reinsurance gains (losses)   (2.1)   (2.1)
Change in additional liability for certain benefit features unrealized gains   7.8   7.8
Total increase to pre-tax other comprehensive income   5.7   5.7
Total increase to pre-tax comprehensive income   $ 206.8   $ 206.8