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Reinsurance - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2021
USD ($)
Dec. 16, 2020
USD ($)
Dec. 31, 2018
USD ($)
Negative Ceding Commission $ 18.2 $ 437.7        
Net Realized Gain Related to the Transfer of Investments 76.7 1,199.1 $ (23.2)      
Transaction Costs Related to Reinsurance Transaction 1,008.6 996.6 943.6      
Income Taxes Receivable, Net Operating Loss, CARES Act 36.5 36.5        
Reinsurance Recoverables, Incurred but Not Reported Claims 8,697.8 8,378.9 $ 2,246.8     $ 2,227.3
Prepaid Reinsurance Premiums $ 777.1 813.0        
Number of companies that make up majority of reinsurance recoverable 9          
Closed Block Individual Disability Reinsurance Transaction            
Net Realized Gain Related to the Transfer of Investments $ 67.6 1,302.3        
Increase in Benefits and Change in Reserves for Future Benefits 133.1 1,284.5        
Transaction Costs Related to Reinsurance Transaction 6.2 21.0        
Reinsurance Recoverables, Incurred but Not Reported Claims       $ 990.0 $ 6,141.5  
Prepaid Reinsurance Premiums       43.1 815.7  
Deposit Contracts, Assets       $ 5.0 $ 88.2  
Amortization of Prepaid Reinsurance Premium $ 79.1 $ 2.6        
AM Best A Rating or Better | Reinsurer Concentration Risk | Reinsurance Recoverable | Commonwealth Annuity and Life Insurance Company            
Percentage of Concentration Risk 60.00%          
AM Best A Rating or Better | Reinsurer Concentration Risk | Reinsurance Recoverable | Top 9 Reinsurers            
Percentage of Concentration Risk 35.00%          
AM Best, A- Rating | Reinsurer Concentration Risk | Reinsurance Recoverable | Other Reinsurers            
Percentage of Concentration Risk 5.00%          
AM Best, Below A- or Not Rated | Reinsurer Concentration Risk | Reinsurance Recoverable | Other Reinsurers            
Percentage of Concentration Risk 1.00%