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Income Taxes (Reconciliations Of United States Corporate Income Tax Rate To Effective Tax Rate On Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
U.S. corporate tax rate 21.00% 21.00% 21.00%
State income taxes, net of U.S. federal income tax benefit, Percent (1.00%) 2.20% (0.40%)
Tax-exempt investment income, percent (0.60%) 10.60% (0.50%)
Foreign operations, percent 0.40% (3.50%) 0.50%
Impairment of goodwill, percent 0.00% (11.10%) 0.00%
Markel CATCo Re income not subject to tax, percent (0.60%) 12.50% 0.00%
Other, percent (0.40%) 4.50% 0.50%
Effective tax rate 20.80% 31.80% 21.90%
Income taxes at U.S. corporate tax rate $ 557,278 $ (31,829) $ 657,264
State income taxes, net of U.S. federal income tax benefit 27,007 3,369 12,689
Tax-exempt investment income (15,328) (16,063) (16,109)
Foreign operations 10,854 5,335 14,443
Impairment of goodwill 0 16,800 0
Markel CATCo Re income not subject to tax (15,013) (18,871) 0
Other (12,182) (6,950) 15,674
Income tax expense (benefit) $ 552,616 $ (48,209) $ 683,961