Risks and Uncertainties (Details) |
Dec. 31, 2025 |
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| EBP WRPSP | W. R. Berkley Corporation Common Stock Fund | |
| EBP, Risk and Uncertainty [Line Items] | |
| Concentration of investment to net assets, percentage | 11.00% |
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- Definition Percentage of investment at fair value held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), to net assets available for benefit representing concentration risk at or above applicable threshold. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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