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Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]        
Gross reserves for losses and loss adjustment expenses, beginning of year     $ 20,947,898 $ 18,178,894
Reinsurance recoverable on unpaid losses, beginning of year     7,994,884 6,876,317
Net reserves for losses and loss adjustment expenses, beginning of year     12,953,014 11,302,577
Effect of foreign currency rate changes on beginning of year balance $ 16,246 $ (275,364) 16,246 (275,364)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year     12,969,260 11,027,213
Incurred losses and loss adjustment expenses, current accident years 1,434,871 1,266,996 3,934,969 3,420,906
Incurred losses and loss adjustment expenses, prior accident years     (169,754) (204,411)
Total incurred losses and loss adjustment expenses     3,765,215 3,216,495
Payments, current accident year     419,998 350,684
Payments, prior accident years     2,018,199 1,880,471
Total payments     2,438,197 2,231,155
Effect of foreign currency rate changes on current year activity     416 (7,499)
Net reserves for losses and loss adjustment expenses of Markel CATCo Re     (146,895) 375,222
Reinsurance recoverable for retroactive reinsurance transaction (125,067) 0 (125,067) 0
Net reserves for losses and loss adjustment expenses, end of period 14,024,732 12,380,276 14,024,732 12,380,276
Reinsurance recoverable on unpaid losses 8,119,634 7,814,098 8,119,634 7,814,098
Gross reserves for losses and loss adjustment expenses, end of period $ 22,144,366 $ 20,194,374 $ 22,144,366 $ 20,194,374