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Reinsurance and Policy Provisions (North End Re) (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Basis_Points
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Basis_Points
yearOfAgreement
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2022
Oct. 08, 2021
USD ($)
Jul. 01, 2021
USD ($)
Ceded Credit Risk [Line Items]                
Other revenue     $ 43,921 $ 15,670 $ 0      
Other liabilities $ 1,656,509 $ 2,079,977 1,656,509 2,079,977        
Coinsurance deposits (net of allowance for credit losses of $8,737 as of 2022 and $2,264 as of 2021) $ 13,208,399 8,850,608 $ 13,208,399 8,850,608        
Third party ownership interest in Company's common stock 18.70%   18.70%     16.00%    
North End Re, Reinsurance Agreement, In Force as of July 1, 2021                
Ceded Credit Risk [Line Items]                
Reinsurance liabilities, amount ceded               $ 4,300,000
Modified coinsurance basis, percentage     70.00%          
Coinsurance basis, percentage     30.00%          
Annual ceding commission, basis points | Basis_Points 49   49          
Annual asset liability management fee, basis points | Basis_Points 30   30          
Contractually guaranteed fees, duration     6 years          
Fees contingent on certain performance obligations, agreement year | yearOfAgreement     7          
Ceding commission, initial net present value   114,100            
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 | Reinsurance Contract [Axis]: North End Re, Coinsurance Basis                
Ceded Credit Risk [Line Items]                
Cash transferred at close of reinsurance agreement             $ 1,100,000  
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 | Reinsurance Contract [Axis]: North End Re, Modified Coinsurance Basis                
Ceded Credit Risk [Line Items]                
Cash transferred at close of reinsurance agreement             $ 2,600,000  
North End Re, Reinsurance Agreement, July 1, 2021 Going Forward                
Ceded Credit Risk [Line Items]                
Modified coinsurance basis, percentage     70.00%          
Coinsurance basis, percentage     30.00%          
Annual ceding commission, basis points | Basis_Points 140   140          
Annual asset liability management fee, basis points | Basis_Points 30   30          
Contractually guaranteed fees, duration     6 years          
Fees contingent on certain performance obligations, agreement year | yearOfAgreement     7          
Ceding commission, initial net present value   27,100 $ 67,700          
Coninsurance on certain annuities, percentage     75.00%          
North End Re, Reinsurance Agreement Amendment, In Force Issued After July 1, 2021                
Ceded Credit Risk [Line Items]                
Modified coinsurance basis, percentage 70.00%              
Coinsurance basis, percentage 30.00%              
Coninsurance on certain annuities, percentage 75.00%              
North End Re                
Ceded Credit Risk [Line Items]                
Net investment income earned by assets in modco account     $ 95,400 11,400        
Coinsurance deposits (net of allowance for credit losses of $8,737 as of 2022 and $2,264 as of 2021) $ 5,700,000 4,600,000 5,700,000 4,600,000        
Reinsurance payable 124,200 127,900 124,200 127,900        
North End Re | Other Liabilities, Deferred Gain                
Ceded Credit Risk [Line Items]                
Other liabilities $ 481,200 $ 321,700 481,200 321,700        
North End Re | Other Income, Asset Liability Management Fee                
Ceded Credit Risk [Line Items]                
Other revenue     12,700 5,500        
North End Re | Other Income, Deferred Gain                
Ceded Credit Risk [Line Items]                
Other revenue     $ 28,400 $ 10,200