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Products, Services and Other Revenues (Schedule Of Revenues From Contracts With Customers By Type) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Leasing revenues $ 37,035 $ 37,305 $ 77,788 $ 79,057
Program services and other fronting fees 46,218 37,563 82,248 66,453
Equity method and other investments income (loss) 10,764 (6,765) 36,789 (7,650)
Disposition gain 0 16,923 0 16,923
Other revenues (losses) 1,767 9,348 2,486 17,689
Products Revenues and Services and Other Revenues 1,531,700 1,457,173 2,750,178 2,600,960
Markel Ventures [Member]        
Disaggregation of Revenue [Line Items]        
Leasing revenues 37,035 37,305 77,788 79,057
Program services and other fronting fees 0 0 0 0
Equity method and other investments income (loss) 1,407 (387) 6,586 1,108
Disposition gain 0 0 0 0
Other revenues (losses) 1,777 9,325 2,504 17,641
Products Revenues and Services and Other Revenues 1,451,174 1,385,813 2,590,715 2,489,752
Other [Member]        
Disaggregation of Revenue [Line Items]        
Leasing revenues 0 0 0 0
Program services and other fronting fees 46,218 37,563 82,248 66,453
Equity method and other investments income (loss) 9,357 (6,378) 30,203 (8,758)
Disposition gain 0 16,923 0 16,923
Other revenues (losses) (10) 23 (18) 48
Products Revenues and Services and Other Revenues 80,526 71,360 159,463 111,208
Revenue from contracts with customers [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 1,435,916 1,362,799 2,550,867 2,428,488
Revenue from contracts with customers [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 840,636 770,171 1,435,228 1,336,066
Revenue from contracts with customers [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 572,734 571,183 1,073,157 1,060,518
Revenue from contracts with customers [Member] | Investment management [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 22,546 21,445 42,482 31,904
Revenue from contracts with customers [Member] | Markel Ventures [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 1,410,955 1,339,570 2,503,837 2,391,946
Revenue from contracts with customers [Member] | Markel Ventures [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 840,636 770,171 1,435,228 1,336,066
Revenue from contracts with customers [Member] | Markel Ventures [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 570,319 569,399 1,068,609 1,055,880
Revenue from contracts with customers [Member] | Markel Ventures [Member] | Investment management [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 0 0 0 0
Revenue from contracts with customers [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 24,961 23,229 47,030 36,542
Revenue from contracts with customers [Member] | Other [Member] | Products [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 0 0 0 0
Revenue from contracts with customers [Member] | Other [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues 2,415 1,784 4,548 4,638
Revenue from contracts with customers [Member] | Other [Member] | Investment management [Member]        
Disaggregation of Revenue [Line Items]        
Other revenues $ 22,546 $ 21,445 $ 42,482 $ 31,904