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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 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 $ 46,000 $ (149,383) 46,000 (149,383)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year     12,999,014 11,153,194
Incurred losses and loss adjustment expenses, current accident years 1,255,767 1,085,215 2,500,098 2,153,910
Incurred losses and loss adjustment expenses, prior accident years     (139,208) (122,728)
Total incurred losses and loss adjustment expenses     2,360,890 2,031,182
Payments, current accident year     164,713 167,262
Payments, prior accident years     1,461,051 1,291,318
Total payments     1,625,764 1,458,580
Effect of foreign currency rate changes on current year activity     (2,949) 221
Net reserves for losses and loss adjustment expenses of Markel CATCo Re     (131,874) 465,196
Reinsurance recoverable for retroactive reinsurance transaction (125,067) 0 (125,067) 0
Net reserves for losses and loss adjustment expenses, end of period 13,474,250 12,191,213 13,474,250 12,191,213
Reinsurance recoverable on unpaid losses 7,900,563 6,871,547 7,900,563 6,871,547
Gross reserves for losses and loss adjustment expenses, end of period $ 21,374,813 $ 19,062,760 $ 21,374,813 $ 19,062,760