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Reserve for Claims and Claim Expenses - Schedule of Liability for Unpaid Claims and Claims Adjustment Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period $ 11,181,648 $ 9,025,961 $ 7,455,128
Net incurred related to:      
Current year 4,024,116 4,586,422 4,125,557
Prior years (450,607) (247,582) (249,470)
Total net incurred 3,573,509 4,338,840 3,876,087
Net paid related to:      
Current year 364,793 105,885 574,230
Prior years 2,630,885 1,924,271 1,649,872
Total net paid 2,995,678 2,030,156 2,224,102
Foreign exchange 62,902 (152,997) (81,152)
Amounts acquired 3,320,202 0 0
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 15,142,583 11,181,648 9,025,961
Reinsurance recoverable as of end of period 5,344,286 4,710,925 4,268,669
Reserve for claims and claim expenses as of end of period $ 20,486,869 $ 15,892,573 $ 13,294,630