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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Increase to income before taxes        
Deferred acquisition costs amortization $ (218.4) $ (85.2) $ (330.5) $ (158.5)
Cost of reinsurance amortization (49.5) 4.3 (43.7) 7.6
Income before income taxes 3,897.1 $ 432.6 4,325.1 $ 1,046.5
Actuarial Balance Re-Cohorting        
Increase to income before taxes        
Deferred acquisition costs amortization (106.6)   (106.6)  
Cost of reinsurance amortization 4.2   4.2  
Unearned revenue liability amortization 32.4   32.4  
Change in additional liability for certain benefit features 139.7   139.7  
Income before income taxes 69.7   69.7  
Increase to pre-tax other comprehensive income        
Deferred acquisition cost unrealized losses (5.6)   (5.6)  
Cost of reinsurance unrealized gains 8.7   8.7  
Unearned revenue liability unrealized gains 8.5   8.5  
Change in additional liability for certain benefit features unrealized gains 24.3   24.3  
Total increase to pre-tax other comprehensive income 35.9   35.9  
Total increase to pre-tax comprehensive income $ 105.6   $ 105.6