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Reinsurance and Policy Provisions (AeBe) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Oct. 03, 2022
Oct. 01, 2022
Ceded Credit Risk [Line Items]            
Other liabilities $ 1,656,509 $ 1,656,509 $ 2,079,977      
Other revenue   43,921 15,670 $ 0    
Coinsurance deposits (net of allowance for credit losses of $8,737 as of 2022 and $2,264 as of 2021) $ 13,208,399 13,208,399 $ 8,850,608      
AeBe ISA LTD            
Ceded Credit Risk [Line Items]            
Reinsurance liabilities, amount ceded           $ 4,300,000
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 (net of allowance for credit losses of $8,737 as of 2022 and $2,264 as of 2021) $ 4,200,000 4,200,000        
Reinsurance payable 38,000 38,000        
AeBe ISA LTD | Other Liabilities, Deferred Gain            
Ceded Credit Risk [Line Items]            
Other liabilities $ 126,300 $ 126,300        
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, Flow Business Ceded | Maximum            
Ceded Credit Risk [Line Items]            
Annual ceding commission as percent of premium received 0.50% 0.50%        
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 Income, Deferred Gain            
Ceded Credit Risk [Line Items]            
Other revenue $ 2,800          
26North            
Ceded Credit Risk [Line Items]            
Net investment income earned by assets in funds withheld account $ 42,300