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Reserve for Claims and Claim Expenses (Additional Information) (Details) - USD ($) | 12 Months Ended
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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

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