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Variable Interest Entities (Markel CATCo Re Balance Sheet) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | $ 3,627,142 | $ 3,747,060 |  |
Restricted cash and cash equivalents | 649,598 | 584,974 |  |
Total Assets | 57,286,385 | 55,045,710 |  |
Unpaid losses and loss adjustment expenses | 24,144,955 | 23,483,321 | $ 21,306,793 | $ 20,947,898
Other liabilities | 3,959,161 | 3,927,498 |  |
Total Liabilities | 40,968,869 | 39,519,817 |  |
Shareholders' equity | 15,729,719 | 14,983,928 |  |
Noncontrolling interests | 87,804 | 72,280 |  |
Total Equity | 15,817,523 | 15,056,208 |  |
Total Liabilities and Equity | 57,286,385 | 55,045,710 |  |
Markel CATCo Re |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | 96,252 | 91,301 |  |
Restricted cash and cash equivalents | 169,280 | 173,800 |  |
Other assets and receivables due from cedents | 18,742 | 19,292 |  |
Total Assets | 284,274 | 284,393 |  |
Unpaid losses and loss adjustment expenses | 168,630 | 184,967 |  |
Other liabilities | 2,380 | 1,842 |  |
Total Liabilities | 171,010 | 186,809 |  |
Shareholders' equity | 21,139 | 21,139 |  |
Noncontrolling interests | 92,125 | 76,445 |  |
Total Equity | 113,264 | 97,584 |  |
Total Liabilities and Equity | $ 284,274 | $ 284,393 |  |

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