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Segment Reporting Disclosures (Company's Segment Disclosures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Earned premiums $ 8,432,412 $ 8,295,479 $ 7,587,792
Net investment income 920,496 734,532 446,755
Net investment gains (losses) 1,807,219 1,524,054 (1,595,733)
Products revenues 2,635,659 2,545,053 2,427,096
Services and other revenues 2,824,977 2,704,512 2,809,425
Total operating revenues 16,620,763 15,803,630 11,675,335
Attritional Current Year Claims and Claims Adjustment Expense 5,437,410 5,320,487 4,531,098
Catastrophe Current Year Claims and Claims Adjustment Expense 70,649 40,072 81,937
Losses and loss adjustment expenses, prior accident years 455,310 38,550 167,446
Amortization of policy acquisition costs (1,754,141) (1,763,670) (1,655,106)
Other underwriting expenses (1,223,248) (1,077,064) (860,477)
Products expenses (2,272,219) (2,220,676) (2,241,736)
Services and other expenses (2,424,372) (2,310,769) (2,306,985)
Amortization of intangible assets (181,472) (180,614) (178,778)
Goodwill, Impairment Loss 0 0 (80,000)
Segment profit (loss) 3,712,562 2,928,828 (93,336)
Interest expense (204,300) (185,077) (196,062)
Net foreign exchange gains (losses) 129,438 (90,045) 137,832
Income (Loss) Before Income Taxes 3,637,700 2,653,706 (151,566)
Insurance [Member]      
Segment Reporting Information [Line Items]      
Earned premiums 7,407,643 7,282,705 6,528,263
Net investment income 0 0 0
Net investment gains (losses) 0 0 0
Products revenues 0 0 0
Services and other revenues 0 0 0
Total operating revenues 7,407,643 7,282,705 6,528,263
Attritional Current Year Claims and Claims Adjustment Expense 4,704,219 4,651,173 3,867,195
Catastrophe Current Year Claims and Claims Adjustment Expense 67,169 39,572 69,230
Losses and loss adjustment expenses, prior accident years 451,016 104,743 142,924
Amortization of policy acquisition costs (1,501,829) (1,508,169) (1,375,539)
Other underwriting expenses (1,163,557) (1,026,358) (809,352)
Products expenses 0 0 0
Services and other expenses 0 0 0
Segment profit (loss) 421,885 162,176 549,871
Reinsurance [Member]      
Segment Reporting Information [Line Items]      
Earned premiums 1,028,201 1,014,294 1,063,347
Net investment income 0 0 0
Net investment gains (losses) 0 0 0
Products revenues 0 0 0
Services and other revenues 0 0 0
Total operating revenues 1,028,201 1,014,294 1,063,347
Attritional Current Year Claims and Claims Adjustment Expense 733,191 669,314 663,903
Catastrophe Current Year Claims and Claims Adjustment Expense 3,480 500 12,707
Losses and loss adjustment expenses, prior accident years 12,344 (57,081) 26,052
Amortization of policy acquisition costs (252,312) (255,501) (279,567)
Other underwriting expenses (56,925) (51,163) (49,363)
Products expenses 0 0 0
Services and other expenses 0 0 0
Segment profit (loss) (5,363) (19,265) 83,859
Investing [Member]      
Segment Reporting Information [Line Items]      
Earned premiums 0 0 0
Net investment income 913,478 729,219 445,846
Net investment gains (losses) 1,807,219 1,524,054 (1,595,733)
Products revenues 0 0 0
Services and other revenues 52,253 (11,854) (17,661)
Total operating revenues 2,772,950 2,241,419 (1,167,548)
Attritional Current Year Claims and Claims Adjustment Expense 0 0 0
Catastrophe Current Year Claims and Claims Adjustment Expense 0 0 0
Losses and loss adjustment expenses, prior accident years 0 0 0
Amortization of policy acquisition costs 0 0 0
Other underwriting expenses 0 0 0
Products expenses 0 0 0
Services and other expenses 0 0 0
Segment profit (loss) 2,772,950 2,241,419 (1,167,548)
Markel Ventures [Member]      
Segment Reporting Information [Line Items]      
Earned premiums 0 0 0
Net investment income 7,018 5,313 909
Net investment gains (losses) 0 0 0
Products revenues 2,635,659 2,545,053 2,427,096
Services and other revenues 2,477,419 2,434,715 2,329,522
Total operating revenues 5,120,096 4,985,081 4,757,527
Attritional Current Year Claims and Claims Adjustment Expense 0 0 0
Catastrophe Current Year Claims and Claims Adjustment Expense 0 0 0
Losses and loss adjustment expenses, prior accident years 0 0 0
Amortization of policy acquisition costs 0 0 0
Other underwriting expenses 0 0 0
Products expenses (2,272,219) (2,220,676) (2,241,736)
Services and other expenses (2,327,795) (2,244,527) (2,111,510)
Amortization of intangible assets (81,317) (82,370)  
Segment profit (loss) 520,082 519,878 404,281
Other Insurance Operations      
Segment Reporting Information [Line Items]      
Earned premiums (3,432) (1,520) (3,818)
Net investment income 0 0 0
Net investment gains (losses) 0 0 0
Products revenues 0 0 0
Services and other revenues 295,305 281,651 497,564
Total operating revenues 291,873 280,131 493,746
Attritional Current Year Claims and Claims Adjustment Expense 0 0 0
Catastrophe Current Year Claims and Claims Adjustment Expense 0 0 0
Losses and loss adjustment expenses, prior accident years (8,050) (9,112) (1,530)
Amortization of policy acquisition costs 0 0 0
Other underwriting expenses (2,766) 457 (1,762)
Products expenses 0 0 0
Services and other expenses (96,577) (66,242) (195,475)
Amortization of intangible assets [1] (62,879) (61,168)  
Segment profit (loss) 184,480 205,234 294,979
Corporate Expense      
Segment Reporting Information [Line Items]      
Earned premiums 0 0 0
Net investment income 0 0 0
Net investment gains (losses) 0 0 0
Products revenues 0 0 0
Services and other revenues 0 0 0
Total operating revenues 0 0 0
Attritional Current Year Claims and Claims Adjustment Expense 0 0 0
Catastrophe Current Year Claims and Claims Adjustment Expense 0 0 0
Losses and loss adjustment expenses, prior accident years 0 0 0
Amortization of policy acquisition costs 0 0 0
Other underwriting expenses 0 0 0
Products expenses 0 0 0
Services and other expenses 0 0 0
Amortization of intangible assets (181,472) (180,614) (178,778)
Goodwill, Impairment Loss     (80,000)
Segment profit (loss) $ (181,472) $ (180,614) $ (258,778)
[1] Amounts included in other insurance operations 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.