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Reserve for Claims and Claim Expenses (Additional Information) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Claims and claim expenses recovered $ (2,029,529,000) $ (968,595,000) $ (1,124,757,000)
Reinsurance balances payable      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Aggregate deposit liabilities 4,200,000 7,500,000  
Aggregate deposit assets      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Aggregate deposit assets 0 0  
Deposit Contracts, Underwriting Risk Only      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Claims and claim expenses recovered 200,000 400,000 0
Deposit Contracts, Timing Risk Only      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Increase in other income related to assumed reinsurance contracts $ 0 $ 1,000,000 $ 1,300,000