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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
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Leasing revenues $ 40,753 $ 41,752
Program services and other fronting fees 36,030 28,890
Equity method and other investments income (loss) 26,025 (885)
Other revenues (losses) 719 8,341
Products Revenues and Services and Other Revenues 1,218,478 1,143,787
Markel Ventures [Member]    
Disaggregation of Revenue [Line Items]    
Leasing revenues 40,753 41,752
Program services and other fronting fees 0 0
Equity method and other investments income (loss) 5,179 1,495
Other revenues (losses) 727 8,316
Products Revenues and Services and Other Revenues 1,139,541 1,103,939
Other Insurance Operations [Member]    
Disaggregation of Revenue [Line Items]    
Leasing revenues 0 0
Program services and other fronting fees 36,030 28,890
Equity method and other investments income (loss) 20,846 (2,380)
Other revenues (losses) (8) 25
Products Revenues and Services and Other Revenues 78,937 39,848
Revenue from contracts with customers [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 1,114,951 1,065,689
Revenue from contracts with customers [Member] | Products [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 594,592 565,895
Revenue from contracts with customers [Member] | Services [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 500,423 489,335
Revenue from contracts with customers [Member] | Investment management [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 19,936 10,459
Revenue from contracts with customers [Member] | Markel Ventures [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 1,092,882 1,052,376
Revenue from contracts with customers [Member] | Markel Ventures [Member] | Products [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 594,592 565,895
Revenue from contracts with customers [Member] | Markel Ventures [Member] | Services [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 498,290 486,481
Revenue from contracts with customers [Member] | Markel Ventures [Member] | Investment management [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 0 0
Revenue from contracts with customers [Member] | Other Insurance Operations [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 22,069 13,313
Revenue from contracts with customers [Member] | Other Insurance Operations [Member] | Products [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 0 0
Revenue from contracts with customers [Member] | Other Insurance Operations [Member] | Services [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues 2,133 2,854
Revenue from contracts with customers [Member] | Other Insurance Operations [Member] | Investment management [Member]    
Disaggregation of Revenue [Line Items]    
Other revenues $ 19,936 $ 10,459