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Reinsurance and Policy Provisions (AeBe) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
 [2]
Oct. 03, 2022
USD ($)
Oct. 01, 2022
USD ($)
Ceded Credit Risk [Line Items]            
Other liabilities $ 1,614,479 [1] $ 3,172,554 $ 1,614,479 [1]      
Other revenue   75,866 42,245 [2] $ 16,160    
Coinsurance deposits 13,254,956 [1] $ 14,582,728 13,254,956 [1]      
AeBe ISA LTD            
Ceded Credit Risk [Line Items]            
Reinsurance liabilities, amount ceded           $ 4,200,000
Funds withheld coinsurance basis, percentage   75.00%        
Coinsurance basis, percentage   25.00%        
Closing ceding commission received at close of reinsurance agreement         $ 70,000  
Coinsurance deposits 4,100,000 $ 3,700,000 4,100,000      
Reinsurance recoverable   41,600        
Reinsurance payable 38,000   38,000      
Ceding commission, net present value   $ 4,600        
AeBe ISA LTD | Maximum            
Ceded Credit Risk [Line Items]            
Annual ceding commission, basis points   0.0035        
AeBe ISA LTD | Other Liabilities, Deferred Gain            
Ceded Credit Risk [Line Items]            
Other liabilities 51,600 $ 61,100 51,600      
AeBe ISA LTD | Reinsurance Contract [Axis]: AeBe ISA LTD, Coinsurance Basis            
Ceded Credit Risk [Line Items]            
Cash and investments transferred at close of reinsurance agreement         1,000,000  
AeBe ISA LTD | Reinsurance Contract [Axis]: AeBe ISA LTD, Funds Withheld Coinsurance Basis            
Ceded Credit Risk [Line Items]            
Cash and investments transferred at close of reinsurance agreement         $ 3,000,000  
AeBe ISA LTD | Other Revenue, Deferred Gain            
Ceded Credit Risk [Line Items]            
Other revenue 1,100 6,500        
AeBe ISA LTD | Other Revenue, Management Services Fee            
Ceded Credit Risk [Line Items]            
Other revenue   4,500 $ 1,200      
26North            
Ceded Credit Risk [Line Items]            
Net investment income earned by assets in funds withheld account $ 42,300 $ 176,200        
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.
[2] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.