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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Intangible [Line Items]      
Net intangible assets, beginning balance $ 1,747,464 $ 1,822,486  
Acquisitions   21,614  
Dispositions (2,000) (2,716)  
Amortization of intangible assets (180,614) [1] (178,778) [2] $ (160,539) [3]
Adjustments to preliminary purchase price allocation 22,671 86,773  
Foreign currency movements and other adjustments 1,163 (1,915)  
Net intangible assets, ending balance 1,588,684 1,747,464 1,822,486
Underwriting [Member]      
Intangible [Line Items]      
Net intangible assets, beginning balance [4] 362,322 401,255  
Acquisitions [4]   0  
Dispositions 0 [4] 0  
Amortization of intangible assets 37,076 [4] 38,533 [4] 41,200
Adjustments to preliminary purchase price allocation 0 [4] 0  
Foreign currency movements and other adjustments [4] 98 (400)  
Net intangible assets, ending balance [4] 325,344 362,322 401,255
Markel Ventures [Member]      
Intangible [Line Items]      
Net intangible assets, beginning balance 796,297 766,179  
Acquisitions   21,614  
Dispositions 0 0  
Amortization of intangible assets (82,370) [1] (79,043) [2] (57,568) [3]
Adjustments to preliminary purchase price allocation 22,671 86,773  
Foreign currency movements and other adjustments 119 774  
Net intangible assets, ending balance 736,717 796,297 766,179
Other Operations [Member]      
Intangible [Line Items]      
Net intangible assets, beginning balance [5] 588,845 655,052  
Acquisitions [5]   0  
Dispositions (2,000) [5] (2,716)  
Amortization of intangible assets [5] (61,168) (61,202)  
Adjustments to preliminary purchase price allocation 0 [5] 0  
Foreign currency movements and other adjustments [5] 946 (2,289)  
Net intangible assets, ending balance [5] $ 526,623 $ 588,845 $ 655,052
[1] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $37.1 million for the year ended December 31, 2023.
[2] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $38.5 million for the year ended December 31, 2022.
[3] Segment profit for the Markel Ventures segment includes amortization of intangible assets attributable to Markel Ventures. Amortization of intangible assets attributable to the Company's underwriting segments, included in Other, was $41.2 million for the year ended December 31, 2021.
[4] 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.
[5] 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.