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Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]    
Gross reserves for losses and loss adjustment expenses, beginning of year $ 26,633,094 $ 23,483,321
Reinsurance recoverable on unpaid losses, beginning of year 11,120,367 8,820,567
Net reserves for losses and loss adjustment expenses, beginning of year 15,512,727 14,662,754
Effect of foreign currency rate changes on beginning of year balance 160,363 45,503
Adjusted net reserves for losses and loss adjustment expenses, beginning of year 15,673,090 14,708,257
Incurred losses and loss adjustment expenses, current accident year 4,156,998 4,155,146
Incurred losses and loss adjustment expenses, prior accident years (360,473) (344,212)
Total incurred losses and loss adjustment expenses 3,796,525 3,810,934
Payments, current accident year 444,603 444,221
Payments, prior accident years 2,640,264 2,415,104
Total payments 3,084,867 2,859,325
Effect of foreign currency rate changes on current year activity 900 1,861
Net reserves for losses and loss adjustment expenses of Markel CATCo Re (2,005) (78,091)
Commutation of ceded reinsurance contracts 312,244 0
Net reserves for losses and loss adjustment expenses, end of period 16,695,887 15,583,636
Reinsurance recoverable on unpaid losses 12,442,082 10,293,842
Gross reserves for losses and loss adjustment expenses, end of period $ 29,137,969 $ 25,877,478