XML 114 R98.htm IDEA: XBRL DOCUMENT v3.20.4
Reserve for Claims and Claim Expenses (Additional Information) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Claims and claim expenses recovered $ (968,595,000) $ (1,124,757,000) $ (1,458,518,000)
Reinsurance balances payable      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Aggregate deposit liabilities 7,500,000 9,000,000.0  
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 400,000 0 200,000
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 $ 1,000,000.0 $ 1,300,000 $ 11,200,000