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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]        
Gross reserves for losses and loss adjustment expenses, beginning of year     $ 23,483,321 $ 20,947,898
Reinsurance recoverable on unpaid losses, beginning of year     8,820,567 7,994,884
Net reserves for losses and loss adjustment expenses, beginning of year     14,662,754 12,953,014
Effect of foreign currency rate changes on beginning of year balance $ (41,045) $ 46,000 (41,045) 46,000
Adjusted net reserves for losses and loss adjustment expenses, beginning of year     14,621,709 12,999,014
Incurred losses and loss adjustment expenses, current accident years 1,376,850 1,255,767 2,741,620 2,500,098
Incurred losses and loss adjustment expenses, prior accident years     (221,298) (139,208)
Total incurred losses and loss adjustment expenses     2,520,322 2,360,890
Payments, current accident year     196,079 164,713
Payments, prior accident years     1,639,765 1,461,051
Total payments     1,835,844 1,625,764
Effect of foreign currency rate changes on current year activity     (1,272) (2,949)
Net reserves for losses and loss adjustment expenses of Markel CATCo Re     (25,726) (131,874)
Reinsurance recoverable for retroactive reinsurance transaction     0 (125,067)
Net reserves for losses and loss adjustment expenses, end of period 15,279,189 13,474,250 15,279,189 13,474,250
Reinsurance recoverable on unpaid losses 9,367,429 7,900,563 9,367,429 7,900,563
Gross reserves for losses and loss adjustment expenses, end of period $ 24,646,618 $ 21,374,813 $ 24,646,618 $ 21,374,813