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Goodwill And Intangible Assets (Components Of Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Goodwill, beginning balance $ 2,624,749 [1] $ 2,638,838
Goodwill, Acquired During Period 114,589  
Goodwill, Adjustments to preliminary purchase price allocation   (16,752)
Foreign currency movements and other adjustments (3,471) 2,663
Goodwill, ending balance [1] 2,735,867 2,624,749
Accumulated impairment losses [1] 190,600 190,600
Insurance [Member]    
Goodwill [Line Items]    
Goodwill, beginning balance 772,823 [1] 771,628
Goodwill, Acquired During Period 0  
Goodwill, Adjustments to preliminary purchase price allocation   0
Foreign currency movements and other adjustments (3,247) 1,195
Goodwill, ending balance [1] 769,576 772,823
Reinsurance [Member]    
Goodwill [Line Items]    
Goodwill, beginning balance 122,745 [1] 122,745
Goodwill, Acquired During Period 0  
Goodwill, Adjustments to preliminary purchase price allocation   0
Foreign currency movements and other adjustments 0 0
Goodwill, ending balance [1] 122,745 122,745
Markel Ventures [Member]    
Goodwill [Line Items]    
Goodwill, beginning balance 1,137,654 [1] 1,153,909
Goodwill, Acquired During Period 114,589  
Goodwill, Adjustments to preliminary purchase price allocation   (16,752)
Foreign currency movements and other adjustments (434) 497
Goodwill, ending balance [1] 1,251,809 1,137,654
Accumulated impairment losses [1] 18,700 18,700
Other Insurance Operations    
Goodwill [Line Items]    
Goodwill, beginning balance [2] 591,527 [1] 590,556
Goodwill, Acquired During Period [2] 0  
Goodwill, Adjustments to preliminary purchase price allocation [2]   0
Foreign currency movements and other adjustments [2] 210 971
Goodwill, ending balance [1],[2] 591,737 591,527
Accumulated impairment losses [1] $ 171,900 $ 171,900
[1] As of December 31, 2024 and 2023, goodwill was net of accumulated impairment losses of $190.6 million, of which $171.9 million was in other insurance operations and $18.7 million was in Markel Ventures.
[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.