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Goodwill And Intangible Assets (Components Of Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]      
Goodwill, beginning balance $ 2,638,838 [1] $ 2,899,140  
Acquisitions   41,905  
Dispositions   (132,455)  
Impairment of goodwill 0 (80,000) $ 0
Adjustments to preliminary purchase price allocation (16,752) (83,358)  
Foreign currency movements and other adjustments 2,663 (6,394)  
Goodwill, ending balance 2,624,749 [1] 2,638,838 [1] 2,899,140
Accumulated impairment losses [1] 190,600 190,600  
Insurance [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance 771,628 [1] 774,712  
Acquisitions   0  
Dispositions   0  
Impairment of goodwill   0  
Adjustments to preliminary purchase price allocation 0 0  
Foreign currency movements and other adjustments 1,195 (3,084)  
Goodwill, ending balance 772,823 [1] 771,628 [1] 774,712
Reinsurance [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance 122,745 [1] 122,745  
Acquisitions   0  
Dispositions   0  
Impairment of goodwill   0  
Adjustments to preliminary purchase price allocation 0 0  
Foreign currency movements and other adjustments 0 0  
Goodwill, ending balance 122,745 [1] 122,745 [1] 122,745
Markel Ventures [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance 1,153,909 [1] 1,196,590  
Acquisitions   41,905  
Dispositions   0  
Impairment of goodwill   0  
Adjustments to preliminary purchase price allocation (16,752) (83,358)  
Foreign currency movements and other adjustments 497 (1,228)  
Goodwill, ending balance 1,137,654 [1] 1,153,909 [1] 1,196,590
Accumulated impairment losses [1] 18,700 18,700  
Other Operations [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance [2] 590,556 [1] 805,093  
Acquisitions [2]   0  
Dispositions [2]   (132,455)  
Impairment of goodwill [2]   (80,000)  
Adjustments to preliminary purchase price allocation [2] 0 0  
Foreign currency movements and other adjustments [2] 971 (2,082)  
Goodwill, ending balance [2] 591,527 [1] 590,556 [1] $ 805,093
Accumulated impairment losses [1] $ 171,900 $ 171,900  
[1] As of December 31, 2023 and 2022, goodwill was net of accumulated impairment losses of $190.6 million, of which $171.9 million was in Other and $18.7 million was in Markel Ventures.
[2] Amounts included in Other 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.