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Reserves for Loss and Loss Expenses (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Net reserves at beginning of period $ 17,166,641 $ 15,661,820  
Net provision for losses and loss expenses:      
Claims occurring during the current year 5,776,795 5,229,468  
Decrease in estimates for claims occurring in prior years 23,129 15,279  
Loss reserve discount accretion 25,149 25,587  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 5,825,073 5,270,334  
Net payments for claims:      
Current year 857,360 795,792  
Prior years 3,684,444 3,164,720  
Total 4,541,804 3,960,512  
Foreign currency translation 151,822 19,659  
Net reserves at end of period 18,601,732 16,991,301 $ 17,166,641
Ceded reserves at end of period 3,155,303 3,164,009  
Gross reserves at end of period $ 21,757,035 $ 20,155,310 $ 20,368,030