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Products, Services and Other Revenues (Schedule Of Revenues From Contracts With Customers By Type) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Leasing revenues $ 176,293 $ 188,904 $ 157,552
Fronting fees 187,480 154,838 147,612
Equity method and other investments income (loss) 58,830 (13,598) (15,120)
Disposition gains 0 16,923 225,828
Other 7,211 42,733 33,970
Total products revenues and services and other revenues 5,460,636 5,249,565 5,236,521
Markel Ventures [Member]      
Disaggregation of Revenue [Line Items]      
Leasing revenues 176,293 188,904 157,552
Fronting fees 0 0 0
Equity method and other investments income (loss) 6,577 (1,744) 2,541
Disposition gains 0 0 0
Other 6,805 42,693 32,930
Total products revenues and services and other revenues 5,113,078 4,979,768 4,756,618
Other [Member]      
Disaggregation of Revenue [Line Items]      
Leasing revenues 0 0 0
Fronting fees 187,480 154,838 147,612
Equity method and other investments income (loss) 52,253 (11,854) (17,661)
Disposition gains 0 16,923 225,828
Other 406 40 1,040
Total products revenues and services and other revenues 347,558 269,797 479,903
Revenue from Contract with Customer [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 5,030,822 4,859,765 4,686,679
Revenue from Contract with Customer [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,607,581 2,487,054 2,379,399
Revenue from Contract with Customer [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,326,015 2,273,202 2,228,071
Revenue from Contract with Customer [Member] | Management Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 97,226 99,509 79,209
Revenue from Contract with Customer [Member] | Markel Ventures [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 4,923,403 4,749,915 4,563,595
Revenue from Contract with Customer [Member] | Markel Ventures [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,607,581 2,487,054 2,379,399
Revenue from Contract with Customer [Member] | Markel Ventures [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,315,822 2,262,861 2,184,196
Revenue from Contract with Customer [Member] | Markel Ventures [Member] | Management Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0 0
Revenue from Contract with Customer [Member] | Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 107,419 109,850 123,084
Revenue from Contract with Customer [Member] | Other [Member] | Products [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0 0
Revenue from Contract with Customer [Member] | Other [Member] | Services [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 10,193 10,341 43,875
Revenue from Contract with Customer [Member] | Other [Member] | Management Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers $ 97,226 $ 99,509 $ 79,209