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Segment Reporting Disclosures (Company's Segment Disclosures) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Earned premiums $ 2,127,627 $ 1,967,704
Net investment income 218,269 159,335
Net investment gains 902,281 372,563
Products revenues 600,840 577,926
Services and other revenues 617,638 565,861
Operating revenues 4,466,655 3,643,389
Losses and loss adjustment expenses, current accident year (1,364,770) (1,244,331)
Losses and loss adjustment expenses, prior accident year 77,023 71,317
Amortization of policy acquisition costs (434,587) (422,132)
Other underwriting expenses (304,165) (253,573)
Products expenses (523,247) (515,756)
Services and other expenses (536,838) (480,619)
Amortization of acquired intangible assets (44,285) (44,399)
Operating Income 1,335,786 753,896
Interest expense (45,548) (49,438)
Net foreign exchange gains (losses) 51,500 (32,928)
Income (Loss) before income taxes 1,341,738 671,530
Insurance [Member]    
Segment Reporting Information [Line Items]    
Earned premiums 1,874,461 1,710,924
Net investment income 0 0
Net investment gains 0 0
Products revenues 0 0
Services and other revenues 0 0
Operating revenues 1,874,461 1,710,924
Losses and loss adjustment expenses, current accident year (1,201,555) (1,077,546)
Losses and loss adjustment expenses, prior accident year 97,181 62,628
Amortization of policy acquisition costs (373,778) (360,354)
Other underwriting expenses (288,999) (239,148)
Products expenses 0 0
Services and other expenses 0 0
Operating Income 107,310 96,504
Reinsurance [Member]    
Segment Reporting Information [Line Items]    
Earned premiums 253,339 257,234
Net investment income 0 0
Net investment gains 0 0
Products revenues 0 0
Services and other revenues 0 0
Operating revenues 253,339 257,234
Losses and loss adjustment expenses, current accident year (163,215) (166,785)
Losses and loss adjustment expenses, prior accident year (3,398) 8,704
Amortization of policy acquisition costs (60,809) (61,778)
Other underwriting expenses (13,907) (13,141)
Products expenses 0 0
Services and other expenses 0 0
Operating Income 12,010 24,234
Investing [Member]    
Segment Reporting Information [Line Items]    
Earned premiums 0 0
Net investment income 217,204 158,594
Net investment gains 902,281 372,563
Products revenues 0 0
Services and other revenues 20,846 (2,380)
Operating revenues 1,140,331 528,777
Losses and loss adjustment expenses, current accident year 0 0
Losses and loss adjustment expenses, prior accident year 0 0
Amortization of policy acquisition costs 0 0
Other underwriting expenses 0 0
Products expenses 0 0
Services and other expenses 0 0
Operating Income 1,140,331 528,777
Markel Ventures [Member]    
Segment Reporting Information [Line Items]    
Earned premiums 0 0
Net investment income 1,065 741
Net investment gains 0 0
Products revenues 600,840 577,926
Services and other revenues 538,701 526,013
Operating revenues 1,140,606 1,104,680
Losses and loss adjustment expenses, current accident year 0 0
Losses and loss adjustment expenses, prior accident year 0 0
Amortization of policy acquisition costs 0 0
Other underwriting expenses 0 0
Products expenses (523,247) (515,756)
Services and other expenses (513,444) (496,746)
Operating Income 103,915 92,178
Other Insurance Operations [Member]    
Segment Reporting Information [Line Items]    
Earned premiums (173) (454)
Net investment income 0 0
Net investment gains 0 0
Products revenues 0 0
Services and other revenues 58,091 42,228
Operating revenues 57,918 41,774
Losses and loss adjustment expenses, current accident year 0 0
Losses and loss adjustment expenses, prior accident year (16,760) (15)
Amortization of policy acquisition costs 0 0
Other underwriting expenses (1,259) (1,284)
Products expenses 0 0
Services and other expenses (23,394) 16,127
Operating Income 16,505 56,602
Corporate [Member]    
Segment Reporting Information [Line Items]    
Earned premiums 0 0
Net investment income 0 0
Net investment gains 0 0
Products revenues 0 0
Services and other revenues 0 0
Operating revenues 0 0
Losses and loss adjustment expenses, current accident year 0 0
Losses and loss adjustment expenses, prior accident year 0 0
Amortization of policy acquisition costs 0 0
Other underwriting expenses 0 0
Products expenses 0 0
Services and other expenses 0 0
Amortization of acquired intangible assets (44,285) (44,399)
Operating Income $ (44,285) $ (44,399)