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Segment Reporting Disclosures (Summary of Additional Measures for Markel Ventures) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Interest expense $ 47,221 $ 50,050 $ 96,659 $ 99,742
Income tax expense 191,937 (238,953) 325,668 (257,089)
Markel Ventures [Member]        
Segment Reporting Information [Line Items]        
Depreciation expense 27,419 26,531 54,782 51,566
Interest expense [1] 12,899 11,025 25,822 22,203
Income tax expense 30,583 22,419 43,769 31,079
Capital expenditures 38,045 50,667 69,543 96,680
Markel Ventures [Member] | Intercompany interest expense        
Segment Reporting Information [Line Items]        
Interest expense $ 6,600 $ 7,000 $ 13,300 [1] $ 14,100 [1]
[1] Interest expense for the quarter and six months ended June 30, 2023 included intercompany interest expense of $6.6 million and $13.3 million, respectively. Interest expense for the quarter and six months ended June 30, 2022 included intercompany interest expense of $7.0 million and $14.1 million. Intercompany interest expense was eliminated in consolidation.