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Unpaid Losses And Loss Adjustment Expenses
 3 Months Ended
Mar. 31, 2025
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]  
Unpaid Losses And Loss Adjustment Expenses Unpaid Losses and Loss Adjustment Expenses
The following table presents a reconciliation of consolidated beginning and ending reserves for losses and loss adjustment expenses.

Three Months Ended March 31,
(dollars in thousands)20252024
Gross reserves for losses and loss adjustment expenses, beginning of year$26,633,094 $23,483,321 
Reinsurance recoverables on unpaid losses, beginning of year11,120,367 8,820,567 
Net reserves for losses and loss adjustment expenses, beginning of year15,512,727 14,662,754 
Effect of foreign currency rate changes on beginning of year balance56,701 (33,620)
Adjusted net reserves for losses and loss adjustment expenses, beginning of year15,569,428 14,629,134 
Incurred losses and loss adjustment expenses:
Current accident year1,404,772 1,364,770 
Prior accident years(150,107)(77,023)
Total incurred losses and loss adjustment expenses1,254,665 1,287,747 
Payments:
Current accident year50,284 75,509 
Prior accident years901,098 819,185 
Total payments951,382 894,694 
Effect of foreign currency rate changes on current year activity54 (1,018)
Change in net reserves for losses and loss adjustment expenses of Markel CATCo Re
(121)(16,338)
Net reserves for losses and loss adjustment expenses, end of period15,872,644 15,004,831 
Reinsurance recoverables on unpaid losses12,015,613 9,140,124 
Gross reserves for losses and loss adjustment expenses, end of period$27,888,257 $24,144,955 
For the three months ended March 31, 2025, current accident year losses and loss adjustment expenses included $66.1 million of net losses and loss adjustment expenses attributed to the series of wildfires that occurred in southern California in January 2025 (California Wildfires). The net losses and loss adjustment expenses attributed to the California Wildfires as of March 31, 2025 represent the Company's best estimate based upon information currently available. This loss estimate was based on claims received, policy level reviews and an analysis of ceded reinsurance contracts. The Company's estimate is based on various assumptions about coverage and liability and is therefore subject to change. While the Company believes its net reserves for the California Wildfires as of March 31, 2025 are adequate, it continues to closely monitor reported claims and may adjust the estimate of ultimate net losses as new information becomes available.

For the three months ended March 31, 2025, prior accident years losses and loss adjustment expenses included $150.1 million of favorable development on prior years loss reserves, which included $109.2 million of favorable development on the Company's professional liability and general liability product lines across both its underwriting segments.

For the three months ended March 31, 2024, prior accident years losses and loss adjustment expenses included $77.0 million of favorable development on prior years loss reserves, which included $64.8 million of favorable development on the Company's international professional liability and marine and energy product lines within its Insurance segment.