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Segment Reporting Disclosures (Summary Of Segment Revenue By Product) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Product Information [Line Items]      
Earned premiums $ 8,295,479 $ 7,587,792 $ 6,503,029
Products revenues 2,545,053 2,427,096 1,712,120
Services and other revenues 2,704,512 2,809,425 2,285,325
Total products revenues and services and other revenues 5,249,565 5,236,521 3,997,445
Insurance [Member]      
Product Information [Line Items]      
Earned premiums 7,282,705 6,528,263 5,465,284
Products revenues 0   0
Services and other revenues 0 0 0
Insurance [Member] | General liability [Member]      
Product Information [Line Items]      
Earned premiums 2,128,317 1,927,721 1,564,221
Insurance [Member] | Professional liability [Member]      
Product Information [Line Items]      
Earned premiums 1,798,882 1,739,983 1,523,536
Insurance [Member] | Property [Member]      
Product Information [Line Items]      
Earned premiums 532,337 428,563 362,637
Insurance [Member] | Marine and energy [Member]      
Product Information [Line Items]      
Earned premiums 688,591 585,885 495,897
Insurance [Member] | Personal Lines [Member]      
Product Information [Line Items]      
Earned premiums 538,816 489,648 451,095
Insurance [Member] | Programs [Member]      
Product Information [Line Items]      
Earned premiums 509,866 384,952 222,410
Insurance [Member] | Workers' compensation [Member]      
Product Information [Line Items]      
Earned premiums 393,011 385,054 354,337
Insurance [Member] | Credit and surety [Member]      
Product Information [Line Items]      
Earned premiums 219,542 193,701 161,155
Insurance [Member] | Other products [Member]      
Product Information [Line Items]      
Earned premiums 473,343 392,756 329,996
Reinsurance [Member]      
Product Information [Line Items]      
Earned premiums 1,014,294 1,063,347 1,042,048
Products revenues 0   0
Services and other revenues 0 0 0
Reinsurance [Member] | General liability [Member]      
Product Information [Line Items]      
Earned premiums 368,376 382,482 314,699
Reinsurance [Member] | Professional liability [Member]      
Product Information [Line Items]      
Earned premiums 388,610 398,839 320,646
Reinsurance [Member] | Property [Member]      
Product Information [Line Items]      
Earned premiums 12,182 6,993 129,760
Reinsurance [Member] | Specialty [Member]      
Product Information [Line Items]      
Earned premiums 245,126 275,033 276,943
Other [Member]      
Product Information [Line Items]      
Earned premiums (1,520) [1] (3,818) [2] (4,303) [3]
Products revenues 0 [1]   0 [3]
Services and other revenues 281,651 [1] 497,564 [2] 346,445 [3]
Total products revenues and services and other revenues 269,797 479,903 353,629
Markel Ventures [Member]      
Product Information [Line Items]      
Earned premiums 0 0 0
Products revenues 2,545,053 2,427,096 1,712,120
Services and other revenues 2,434,715 2,329,522 1,931,696
Total products revenues and services and other revenues 4,979,768 4,756,618 3,643,816
Markel Ventures [Member] | Consumer and building      
Product Information [Line Items]      
Products revenues 1,474,499 1,510,130 911,422
Markel Ventures [Member] | Transportation-related      
Product Information [Line Items]      
Products revenues 667,040 612,467 474,839
Markel Ventures [Member] | Equipment manufacturing      
Product Information [Line Items]      
Products revenues 403,514 304,499 325,859
Markel Ventures [Member] | Construction      
Product Information [Line Items]      
Services and other revenues 2,042,326 1,910,403 1,554,592
Markel Ventures [Member] | Consulting      
Product Information [Line Items]      
Services and other revenues 297,115 326,549 277,902
Markel Ventures [Member] | Other services      
Product Information [Line Items]      
Services and other revenues $ 95,274 $ 92,570 $ 99,202
[1] Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to the underwriting segments, which is not allocated between the Insurance and Reinsurance segments.
[2] Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to the underwriting segments, which is not allocated between the Insurance and Reinsurance segments.
[3] Other represents the total profit (loss) attributable to the Company's operations that are not included in a reportable segment, as well as amortization of intangible assets attributable to the underwriting segments, which is not allocated between the Insurance and Reinsurance segments.