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Goodwill And Intangible Assets Goodwill And Intangible Assets (Components of Net Intangible Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Intangible [Line Items]      
Net intangible assets, beginning balance $ 1,588,684 $ 1,747,464  
Intangible Assets Acquired During Period 52,909    
Dispositions   (2,000)  
Amortization of intangible assets (181,472) (180,614) $ (178,778)
Adjustments to preliminary purchase price allocation   22,671  
Foreign currency movements and other adjustments (501) 1,163  
Net intangible assets, ending balance 1,459,620 1,588,684 1,747,464
Underwriting [Member]      
Intangible [Line Items]      
Net intangible assets, beginning balance [1] 325,344 362,322  
Intangible Assets Acquired During Period [1] 0    
Dispositions   0  
Amortization of intangible assets [1] 37,276 37,076  
Adjustments to preliminary purchase price allocation   0  
Foreign currency movements and other adjustments [1] (117) 98  
Net intangible assets, ending balance [1] 287,951 325,344 362,322
Markel Ventures [Member]      
Intangible [Line Items]      
Net intangible assets, beginning balance 736,717 796,297  
Intangible Assets Acquired During Period 52,909    
Dispositions   0  
Amortization of intangible assets (81,317) (82,370)  
Adjustments to preliminary purchase price allocation   22,671  
Foreign currency movements and other adjustments 154 119  
Net intangible assets, ending balance 708,463 736,717 796,297
Other Insurance Operations      
Intangible [Line Items]      
Net intangible assets, beginning balance [2] 526,623 588,845  
Intangible Assets Acquired During Period [2] 0    
Dispositions   (2,000)  
Amortization of intangible assets [2] (62,879) (61,168)  
Adjustments to preliminary purchase price allocation   0  
Foreign currency movements and other adjustments [2] (538) 946  
Net intangible assets, ending balance [2] $ 463,206 $ 526,623 $ 588,845
[1] Amounts included in Underwriting reflect the intangible assets associated with the Company's underwriting segments, which are not allocated between the Insurance and Reinsurance segments.
[2] Amounts included in other insurance operations reflect the Company's operations that are not included in a reportable segment and are primarily related to the Company's program services and insurance-linked securities operations.