v3.25.2
Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2025
Jun. 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 183,407 (41,045)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year 15,696,134 14,621,709
Incurred losses and loss adjustment expenses, current accident year 2,771,538 2,741,620
Incurred losses and loss adjustment expenses, prior accident years (228,839) (221,298)
Total incurred losses and loss adjustment expenses 2,542,699 2,520,322
Payments, current accident year 211,521 196,079
Payments, prior accident years 1,856,906 1,639,765
Total payments 2,068,427 1,835,844
Effect of foreign currency rate changes on current year activity 824 (1,272)
Net reserves for losses and loss adjustment expenses of Markel CATCo Re (2,005) (25,726)
Net reserves for losses and loss adjustment expenses, end of period 16,169,225 15,279,189
Reinsurance recoverable on unpaid losses 12,346,166 9,367,429
Gross reserves for losses and loss adjustment expenses, end of period $ 28,515,391 $ 24,646,618