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Reinsurance - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Negative Ceding Commission     $ 18.2  
Net Realized Gain Related to the Transfer of Investments $ (36.0) $ (15.7) 76.7  
Transaction Costs Related to Reinsurance Transaction 1,112.0 1,006.7 999.3  
reduction in cost of reinsurance $ (44.1) (50.3) (69.8)  
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  
Transaction Costs Related to Reinsurance Transaction     6.2  
Reinsurance Recoverables, Incurred but Not Reported Claims       $ 1,132.5
reduction in cost of reinsurance     (99.4)  
Deposit Contracts, Assets       $ 5.0
Amortization of Prepaid Reinsurance Premium $ 44.1 $ 50.3 $ 69.8  
AM Best A Rating or Better | Reinsurer Concentration Risk | Reinsurance Recoverable | Commonwealth Annuity and Life Insurance Company        
Percentage of Concentration Risk 56.00%      
AM Best A Rating or Better | Reinsurer Concentration Risk | Reinsurance Recoverable | Top 9 Reinsurers        
Percentage of Concentration Risk 39.00%      
AM Best, A- Rating | Reinsurer Concentration Risk | Reinsurance Recoverable | Other Reinsurers        
Percentage of Concentration Risk 4.00%      
AM Best, Below A- or Not Rated | Reinsurer Concentration Risk | Reinsurance Recoverable | Other Reinsurers        
Percentage of Concentration Risk 1.00%