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Segment Reporting Disclosures (Company's Segment Disclosures) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Earned premiums $ 2,205,773 $ 2,110,108 $ 6,436,838 $ 6,314,834
Net investment income 245,675 235,477 712,779 676,807
Products revenues 607,493 612,277 2,015,542 2,060,336
Services and other revenues 875,608 735,872 2,340,109 2,037,991
Operating revenues 3,934,549 3,693,734 11,505,268 11,089,968
Attritional Current Year Claims and Claims Adjustment Expense (1,389,775) (1,351,526) (4,100,436) (4,093,146)
Catastrophe Current Year Claims and Claims Adjustment Expense 4,315 (62,000) (56,562) (62,000)
Losses and loss adjustment expenses, prior accident year 131,634 122,914 360,473 344,212
Amortization of policy acquisition costs (446,057) (431,674) (1,298,444) (1,287,900)
Other underwriting expenses (336,444) (311,882) (1,005,706) (904,703)
Products expenses (555,493) (549,990) (1,762,782) (1,766,930)
Services and other expenses (721,712) (609,321) (1,963,927) (1,757,222)
Adjusted operating income (loss) 621,017 500,255 1,677,884 1,562,279
Net investment gains 432,886 917,530 864,038 1,689,794
Amortization of acquired intangible assets (44,061) (46,459) (142,216) (134,981)
Interest expense (50,678) (53,361) (155,894) (151,506)
Net foreign exchange gains (losses) 19,279 (111,612) (245,263) (51,401)
Income before income taxes 978,443 1,206,353 1,998,549 2,914,185
Markel Insurance        
Segment Reporting Information [Line Items]        
Earned premiums 2,127,648 2,035,773 6,207,809 6,086,418
Net investment income 223,409 203,767 638,654 583,349
Products revenues 0 0 0 0
Services and other revenues 47,349 18,085 58,252 35,449
Operating revenues 2,398,406 2,257,625 6,904,715 6,705,216
Attritional Current Year Claims and Claims Adjustment Expense (1,346,411) (1,310,108) (3,977,735) (3,959,695)
Catastrophe Current Year Claims and Claims Adjustment Expense 4,315 (62,000) (56,562) (62,000)
Losses and loss adjustment expenses, prior accident year 129,100 119,408 356,871 343,510
Amortization of policy acquisition costs (440,568) (426,149) (1,280,953) (1,270,322)
Other underwriting expenses (318,605) (294,768) (950,589) (854,661)
Products expenses 0 0 0 0
Services and other expenses 2,238 (8,405) (15,402) (21,567)
Adjusted operating income (loss) 428,475 275,603 980,345 880,481
Net investment gains 389,438 709,130 745,816 1,300,433
Industrial        
Segment Reporting Information [Line Items]        
Earned premiums 0 0 0 0
Net investment income 0 0 0 0
Products revenues 425,714 438,858 1,219,532 1,280,894
Services and other revenues 624,247 559,450 1,675,718 1,503,654
Operating revenues 1,049,961 998,308 2,895,250 2,784,548
Attritional Current Year Claims and Claims Adjustment Expense 0 0 0 0
Catastrophe Current Year Claims and Claims Adjustment Expense 0 0 0 0
Losses and loss adjustment expenses, prior accident year 0 0 0 0
Amortization of policy acquisition costs 0 0 0 0
Other underwriting expenses 0 0 0 0
Products expenses (365,957) (364,923) (1,058,275) (1,073,044)
Services and other expenses (582,702) (521,612) (1,573,396) (1,454,278)
Adjusted operating income (loss) 101,302 111,773 263,579 257,226
Net investment gains 0 0 0 0
Financial        
Segment Reporting Information [Line Items]        
Earned premiums 78,125 74,335 229,029 228,416
Net investment income 10,020 10,012 28,578 29,797
Products revenues 0 0 0 0
Services and other revenues 73,356 54,503 255,227 175,798
Operating revenues 161,501 138,850 512,834 434,011
Attritional Current Year Claims and Claims Adjustment Expense (43,364) (41,418) (122,701) (133,451)
Catastrophe Current Year Claims and Claims Adjustment Expense 0 0 0 0
Losses and loss adjustment expenses, prior accident year 2,534 3,506 3,602 702
Amortization of policy acquisition costs (5,489) (5,525) (17,491) (17,578)
Other underwriting expenses (17,839) (17,114) (55,117) (50,042)
Products expenses 0 0 0 0
Services and other expenses (35,936) 1,353 (101,687) (39,436)
Adjusted operating income (loss) 61,407 79,652 219,440 194,206
Net investment gains 0 10 0 (158)
Consumer and Other        
Segment Reporting Information [Line Items]        
Earned premiums 0 0 0 0
Net investment income 0 0 0 0
Products revenues 181,779 173,419 796,010 779,442
Services and other revenues 109,635 91,880 312,416 284,421
Operating revenues 291,414 265,299 1,108,426 1,063,863
Attritional Current Year Claims and Claims Adjustment Expense 0 0 0 0
Catastrophe Current Year Claims and Claims Adjustment Expense 0 0 0 0
Losses and loss adjustment expenses, prior accident year 0 0 0 0
Amortization of policy acquisition costs 0 0 0 0
Other underwriting expenses 0 0 0 0
Products expenses (189,536) (185,067) (704,507) (693,886)
Services and other expenses (84,506) (80,657) (252,636) (241,941)
Adjusted operating income (loss) 17,372 (425) 151,283 128,036
Net investment gains 0 0 0 0
Corporate and eliminations        
Segment Reporting Information [Line Items]        
Earned premiums 0 0 0 0
Net investment income 12,246 21,698 45,547 63,661
Products revenues 0 0 0 0
Services and other revenues 21,021 11,954 38,496 38,669
Operating revenues 33,267 33,652 84,043 102,330
Attritional Current Year Claims and Claims Adjustment Expense 0 0 0 0
Catastrophe Current Year Claims and Claims Adjustment Expense 0 0 0 0
Losses and loss adjustment expenses, prior accident year 0 0 0 0
Amortization of policy acquisition costs 0 0 0 0
Other underwriting expenses 0 0 0 0
Products expenses 0 0 0 0
Services and other expenses (20,806) 0 (20,806) 0
Adjusted operating income (loss) 12,461 33,652 63,237 102,330
Corporate Operations        
Segment Reporting Information [Line Items]        
Net investment gains $ 43,448 $ 208,390 $ 118,222 $ 389,519