<SEC-DOCUMENT>0000011544-25-000013.txt : 20250613
<SEC-HEADER>0000011544-25-000013.hdr.sgml : 20250613
<ACCEPTANCE-DATETIME>20250613171225
ACCESSION NUMBER:		0000011544-25-000013
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		14
CONFORMED PERIOD OF REPORT:	20250611
ITEM INFORMATION:		Submission of Matters to a Vote of Security Holders
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20250613
DATE AS OF CHANGE:		20250613

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BERKLEY W R CORP
		CENTRAL INDEX KEY:			0000011544
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		ORGANIZATION NAME:           	02 Finance
		EIN:				221867895
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15202
		FILM NUMBER:		251047654

	BUSINESS ADDRESS:	
		STREET 1:		475 STEAMBOAT ROAD
		STREET 2:		.
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
		BUSINESS PHONE:		2036293000

	MAIL ADDRESS:	
		STREET 1:		475 STEAMBOAT ROAD
		STREET 2:		.
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>wrb-20250611.htm
<DESCRIPTION>8-K
<TEXT>
<XBRL>
<?xml version='1.0' encoding='ASCII'?>
<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:41518ec6-8899-4ea8-b70e-7a5ea6dfb4c2,g:10e4460f-4968-41d1-be42-276db11ca60b,d:4cecbd3eca364f128485c332516662ad-->
<html xmlns:ixt-sec="http://www.sec.gov/inlineXBRL/transformation/2015-08-31" xmlns:wrb="http://www.wrberkley.com/20250611" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ix="http://www.xbrl.org/2013/inlineXBRL" xmlns="http://www.w3.org/1999/xhtml" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:dei="http://xbrl.sec.gov/dei/2025" xmlns:us-gaap="http://fasb.org/us-gaap/2025" xmlns:ixt="http://www.xbrl.org/inlineXBRL/transformation/2020-02-12" xmlns:link="http://www.xbrl.org/2003/linkbase" xml:lang="en-US"><head><meta http-equiv="Content-Type" content="text/html"/>


<title>wrb-20250611</title></head><body><div style="display:none"><ix:header><ix:hidden><ix:nonNumeric contextRef="c-1" name="dei:EntityCentralIndexKey" id="f-33">0000011544</ix:nonNumeric><ix:nonNumeric contextRef="c-1" name="dei:AmendmentFlag" id="f-34">false</ix:nonNumeric></ix:hidden><ix:references xml:lang="en-US"><link:schemaRef xlink:type="simple" xlink:href="wrb-20250611.xsd"/></ix:references><ix:resources><xbrli:context id="c-1"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0000011544</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2025-06-11</xbrli:startDate><xbrli:endDate>2025-06-11</xbrli:endDate></xbrli:period></xbrli:context><xbrli:context id="c-2"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0000011544</xbrli:identifier><xbrli:segment><xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">wrb:SubordinatedDebenturesDue20535.625Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity><xbrli:period><xbrli:startDate>2025-06-11</xbrli:startDate><xbrli:endDate>2025-06-11</xbrli:endDate></xbrli:period></xbrli:context><xbrli:context id="c-3"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0000011544</xbrli:identifier><xbrli:segment><xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">wrb:SubordinatedDebenturesDue20565.9Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity><xbrli:period><xbrli:startDate>2025-06-11</xbrli:startDate><xbrli:endDate>2025-06-11</xbrli:endDate></xbrli:period></xbrli:context><xbrli:context id="c-4"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0000011544</xbrli:identifier><xbrli:segment><xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">wrb:SubordinatedDebenturesDue20565.75Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity><xbrli:period><xbrli:startDate>2025-06-11</xbrli:startDate><xbrli:endDate>2025-06-11</xbrli:endDate></xbrli:period></xbrli:context><xbrli:context id="c-5"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0000011544</xbrli:identifier><xbrli:segment><xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">wrb:SubordinatedDebenturesDue20585.70Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity><xbrli:period><xbrli:startDate>2025-06-11</xbrli:startDate><xbrli:endDate>2025-06-11</xbrli:endDate></xbrli:period></xbrli:context></ix:resources></ix:header></div><div id="i4cecbd3eca364f128485c332516662ad_1"></div><div style="min-height:72pt;width:100%"><div style="-sec-extract:summary;text-align:center"><span style="color:#80c9ff;font-family:'Arial',sans-serif;font-size:36pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span><span style="color:#80c9ff;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span></div></div><div style="-sec-extract:summary;margin-top:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:14pt;font-weight:700;line-height:120%">UNITED STATES SECURITIES AND EXCHANGE COMMISSION <br/>Washington, D.C. 20549</span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:18pt;font-weight:700;line-height:120%">FORM <ix:nonNumeric contextRef="c-1" name="dei:DocumentType" id="f-1">8-K</ix:nonNumeric> </span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">CURRENT REPORT</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Date of Report (Date of earliest event reported): <ix:nonNumeric contextRef="c-1" name="dei:DocumentPeriodEndDate" format="ixt:date-monthname-day-year-en" id="f-2">June&#160;11, 2025</ix:nonNumeric> </span></div><div style="margin-top:5pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:35.096%"><tr><td style="width:1.0%"/><td style="width:70.132%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:27.668%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Commission File Number</span></div></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="c-1" name="dei:EntityFileNumber" id="f-3">1-15202</ix:nonNumeric></span></div></td></tr></table></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span><br/></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:24pt;font-weight:700;line-height:120%">&#160;&#160;&#160;&#160;&#160;<ix:nonNumeric contextRef="c-1" name="dei:EntityRegistrantName" id="f-4">W. R. BERKLEY CORP</ix:nonNumeric>ORATION&#160;&#160;&#160;&#160;&#160;</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:24pt;font-weight:400;line-height:120%"> <br/></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">(Exact name of registrant as specified in its charter)</span></div><div style="text-align:center"><span><br/></span></div><div style="margin-top:5pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:35.117%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:10.630%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:10.630%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:12.389%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:25.734%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%;text-decoration:underline"><ix:nonNumeric contextRef="c-1" name="dei:EntityIncorporationStateCountryCode" format="ixt-sec:stateprovnameen" id="f-5">Delaware</ix:nonNumeric></span></td><td colspan="6" style="padding:0 1pt"/><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%;text-decoration:underline"><ix:nonNumeric contextRef="c-1" name="dei:EntityTaxIdentificationNumber" id="f-6">22-1867895</ix:nonNumeric></span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(State or other jurisdiction of<br/>incorporation or organization)</span></td><td colspan="6" style="padding:0 1pt"/><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(I.R.S. Employer Identification No.)</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">&#160;</span></td><td colspan="6" style="padding:0 1pt"/><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">&#160;</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%;text-decoration:underline"><ix:nonNumeric contextRef="c-1" name="dei:EntityAddressAddressLine1" id="f-7">475 Steamboat Road</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%;text-decoration:underline"><ix:nonNumeric contextRef="c-1" name="dei:EntityAddressCityOrTown" id="f-8">Greenwich</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%;text-decoration:underline"><ix:nonNumeric contextRef="c-1" name="dei:EntityAddressStateOrProvince" format="ixt-sec:stateprovnameen" id="f-9">Connecticut</ix:nonNumeric></span></td><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%;text-decoration:underline"><ix:nonNumeric contextRef="c-1" name="dei:EntityAddressPostalZipCode" id="f-10">06830</ix:nonNumeric></span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(Address of principal executive offices)</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(Zip Code)</span></td></tr></table></div><div style="text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:20.512%"><tr><td style="width:1.0%"/><td style="width:42.650%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:55.150%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="c-1" name="dei:CityAreaCode" id="f-11">(203)</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="c-1" name="dei:LocalPhoneNumber" id="f-12">629-3000</ix:nonNumeric></span></td></tr></table></div><div style="margin-bottom:3pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(Registrant&#8217;s telephone number, including area code)</span></div><div style="margin-top:5pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:10.647%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:75.405%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:10.648%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:0.25pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">None</span></td><td colspan="3" style="border-bottom:0.25pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="9" style="border-top:0.25pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Former name, former address and former fiscal year, if changed since last report</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">.</span></div></td></tr></table></div><div style="text-align:center"><span><br/></span></div><div style="margin-bottom:12pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:130%">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:130%">see </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:130%">General Instruction A.2. below):</span></div><div style="margin-bottom:2pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="c-1" name="dei:WrittenCommunications" format="ixt-sec:boolballotbox" id="f-13">&#9744;</ix:nonNumeric></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</span></div><div style="margin-bottom:2pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="c-1" name="dei:SolicitingMaterial" format="ixt-sec:boolballotbox" id="f-14">&#9744;</ix:nonNumeric></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</span></div><div style="margin-bottom:2pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="c-1" name="dei:PreCommencementTenderOffer" format="ixt-sec:boolballotbox" id="f-15">&#9744;</ix:nonNumeric></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</span></div><div style="margin-bottom:2pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="c-1" name="dei:PreCommencementIssuerTenderOffer" format="ixt-sec:boolballotbox" id="f-16">&#9744;</ix:nonNumeric></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</span></div><div style="margin-bottom:2pt;margin-top:17pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:40.102%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:2.858%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:17.521%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:2.858%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:31.161%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Title of Each Class</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">&#160;</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Trading Symbol</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">&#160;</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Name of Each Exchange<br/>on Which Registered</span></td></tr><tr><td colspan="3" style="border-top:0.5pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-1" name="dei:Security12bTitle" id="f-17">Common Stock, par value $.20 per share</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">&#160;</span></td><td colspan="3" style="border-top:0.5pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-1" name="dei:TradingSymbol" id="f-18">WRB</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">&#160;</span></td><td colspan="3" style="border-top:0.5pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-1" name="dei:SecurityExchangeName" format="ixt-sec:exchnameen" id="f-19">New York Stock Exchange</ix:nonNumeric></span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-2" name="dei:Security12bTitle" id="f-20">5.700% Subordinated Debentures due 2058</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">&#160;</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-2" name="dei:TradingSymbol" id="f-21">WRB-PE</ix:nonNumeric></span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">&#160;</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-2" name="dei:SecurityExchangeName" format="ixt-sec:exchnameen" id="f-22">New York Stock Exchange</ix:nonNumeric></span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-3" name="dei:Security12bTitle" id="f-23">5.100% Subordinated Debentures due 2059</ix:nonNumeric></span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-3" name="dei:TradingSymbol" id="f-24">WRB-PF</ix:nonNumeric></span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-3" name="dei:SecurityExchangeName" format="ixt-sec:exchnameen" id="f-25">New York Stock Exchange</ix:nonNumeric></span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-4" name="dei:Security12bTitle" id="f-26">4.250% Subordinated Debentures due 2060</ix:nonNumeric></span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-4" name="dei:TradingSymbol" id="f-27">WRB-PG</ix:nonNumeric></span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-4" name="dei:SecurityExchangeName" format="ixt-sec:exchnameen" id="f-28">New York Stock Exchange</ix:nonNumeric></span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-5" name="dei:Security12bTitle" id="f-29">4.125% Subordinated Debentures due 2061</ix:nonNumeric></span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-5" name="dei:TradingSymbol" id="f-30">WRB-PH</ix:nonNumeric></span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="c-5" name="dei:SecurityExchangeName" format="ixt-sec:exchnameen" id="f-31">New York Stock Exchange</ix:nonNumeric></span></td></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr></table></div><div style="height:36pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div><hr style="page-break-after:always"/><div style="min-height:72pt;width:100%"><div style="-sec-extract:summary;text-align:center"><span style="color:#80c9ff;font-family:'Arial',sans-serif;font-size:36pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span></div><div><span><br/></span></div></div><div style="margin-bottom:2pt;margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (&#167;230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (&#167;240.12b-2 of this chapter).&#160;&#160;&#160;&#160;Emerging growth company  &#160;&#160;&#160;&#160;</span><span style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="c-1" name="dei:EntityEmergingGrowthCompany" format="ixt-sec:boolballotbox" id="f-32">&#9744;</ix:nonNumeric></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span></div><div style="margin-bottom:2pt;margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. &#160;&#160;&#160;&#160;</span><span style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#9744;</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span></div><div style="height:36pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div><div id="i4cecbd3eca364f128485c332516662ad_7"></div><hr style="page-break-after:always"/><div style="min-height:72pt;width:100%"><div style="text-align:center"><span style="color:#80c9ff;font-family:'Arial',sans-serif;font-size:36pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span></div><div><span><br/></span></div></div><div style="margin-bottom:12pt;padding-left:27pt;text-indent:-27pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">Item 5.07</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">Submission of Matters to a Vote of Security Holders.</span></div><div style="text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:112%">W. R. Berkley Corporation (the &#8220;Company&#8221;) held its Annual Meeting of Stockholders on June 11, 2025. The meeting involved: (i) the election of four directors for terms to expire (a) in the case of nominees Mary C. Farrell and Marie A. Mattson, at the Company&#8217;s Annual Meeting of Stockholders to be held in 2028, (b) in the case of nominee Ronald E. Blaylock, at the Company&#8217;s Annual Meeting of Stockholders to be held in 2027, and (c) in the case of nominee Robert A. Rusbuldt, at the Annual Meeting of Stockholders to be held in 2026, in each case and until their respective successors are duly elected and qualified, unless sooner displaced; (ii) a resolution approving an amendment to the Company&#8217;s restated certificate of incorporation to increase the authorized number of shares of common stock from 1,250,000,000 to 1,875,000,000; (iii) a resolution approving, on a non-binding advisory basis, the compensation of the Company&#8217;s named executive officers as disclosed in the Company&#8217;s proxy statement for the 2025 Annual Meeting of Stockholders pursuant to the compensation disclosure rules of the Securities and Exchange Commission, or &#8220;say-on-pay&#8221; vote; (iv) the ratification of the appointment of KPMG LLP as the Company&#8217;s independent registered public accounting firm for the fiscal year ending December 31, 2025; and (v) a stockholder proposal regarding director election resignation governance policy.</span></div><div style="margin-bottom:6pt;margin-top:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:107%">The directors elected and the final voting results are as follows:</span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">(i)&#160;&#160;&#160;&#160;Election of Directors:</span></div><div style="margin-bottom:6pt;margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:491.25pt"><tr><td style="width:1.0pt"/><td style="width:127.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:94.00pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:78.25pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:67.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:102.25pt"/><td style="width:1.0pt"/></tr><tr style="height:20pt"><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Nominee</span></div></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">For</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Against</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Abstain</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Broker Non Votes</span></div></td></tr><tr style="height:20pt"><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;padding-left:6.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Ronald E. Blaylock</span></div></td><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">307,544,645&#160;</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:middle"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">43,281,054&#160;</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:middle"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">328,599</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">21,292,357</span></td></tr><tr style="height:20pt"><td colspan="3" style="padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Mary C. Farrell</span></td><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">322,167,716&#160;</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:middle"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">25,901,262&#160;</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:middle"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">3,085,320</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">21,292,357</span></td></tr><tr style="height:20pt"><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;padding-left:6.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Marie A. Mattson</span></div></td><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">342,632,757&#160;</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:middle"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">8,203,501&#160;</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:middle"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">318,040</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">21,292,357</span></td></tr><tr style="height:20pt"><td colspan="3" style="padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Robert A. Rusbuldt</span></td><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">348,947,436&#160;</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:middle"/><td colspan="3" style="padding:0 1pt"/><td colspan="2" style="padding:2px 0 2px 1pt;text-align:right;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">1,928,011&#160;</span></td><td style="padding:2px 1pt 2px 0;text-align:right;vertical-align:middle"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">278,851</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">21,292,357</span></td></tr></table></div><div style="padding-left:36pt;text-indent:-36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:107%">(ii)&#160;&#160;&#160;&#160;Resolution Approving an Amendment to the Company&#8217;s Restated Certificate of Incorporation to Increase the Authorized Number of Shares of Common Stock from 1,250,000,000 to 1,875,000,000:</span></div><div style="margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:387.00pt"><tr><td style="width:1.0pt"/><td style="width:127.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:94.00pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:78.25pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:67.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td colspan="3" style="display:none"/></tr><tr style="height:20pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">For</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Against</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Abstain</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="display:none"/></tr><tr style="height:20pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">359,000,574</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">12,959,472</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">486,609</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="display:none"/></tr></table></div><div style="margin-top:5pt;padding-left:36pt;text-indent:-36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:107%">(iii)&#160;&#160;&#160;&#160;Non-Binding Advisory Vote on the Compensation of the Company&#8217;s Named Executive Officers (&#8220;Say-on-Pay&#8221; Vote):</span></div><div style="margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:489.75pt"><tr><td style="width:1.0pt"/><td style="width:127.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:94.00pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:78.25pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:67.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:100.75pt"/><td style="width:1.0pt"/></tr><tr style="height:20pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">For</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Against</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Abstain</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Broker Non Votes</span></div></td></tr><tr style="height:20pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">336,306,919</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">10,835,813</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">4,011,566</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">21,292,357</span></td></tr></table></div><div style="margin-top:5pt;padding-left:36pt;text-indent:-36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:107%">(iv)&#160;&#160;&#160;&#160;Ratification of the Appointment of KPMG LLP:</span></div><div style="margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:387.00pt"><tr><td style="width:1.0pt"/><td style="width:127.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:94.00pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:78.25pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:67.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td colspan="3" style="display:none"/></tr><tr style="height:20pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">For</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Against</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Abstain</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="display:none"/></tr><tr style="height:20pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">354,160,488</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">18,064,502</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">221,665</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="display:none"/></tr></table></div><div style="margin-top:5pt;padding-left:36pt;text-indent:-36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:107%">(v)&#160;&#160;&#160;&#160;A Stockholder Proposal Regarding Director Election Resignation Governance Policy:</span></div><div style="margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:497.25pt"><tr><td style="width:1.0pt"/><td style="width:133.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:87.25pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:79.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.75pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:75.25pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:1.00pt"/><td style="width:1.0pt"/><td style="width:1.0pt"/><td style="width:100.75pt"/><td style="width:1.0pt"/></tr><tr style="height:20pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">For</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Against</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Abstain</span></div></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="margin-bottom:6pt;text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%;text-decoration:underline">Broker Non-Votes</span></div></td></tr><tr style="height:20pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">34,358,174</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">316,104,684</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">691,440</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:middle"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">21,292,357</span></td></tr></table></div><div style="height:27pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div><div id="i4cecbd3eca364f128485c332516662ad_145"></div><hr style="page-break-after:always"/><div style="min-height:72pt;width:100%"><div style="text-align:center"><span style="color:#80c9ff;font-family:'Arial',sans-serif;font-size:36pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span></div><div><span><br/></span></div></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">Item 9.01 Financial Statements and Exhibits. </span></div><div><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">(d) Exhibits </span></div><div><span><br/></span></div><div><span style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%;text-decoration:underline"><a style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%;text-decoration:underline" href="exhibit316132025.htm">Exhibit 3.1</a></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">  Amendment, dated June 11, 2025, to the Company's Restated Certificate of Incorporation, as amended.</span></div><div style="height:27pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div><div id="i4cecbd3eca364f128485c332516662ad_10"></div><hr style="page-break-after:always"/><div style="min-height:72pt;width:100%"><div style="text-align:center"><span style="color:#80c9ff;font-family:'Arial',sans-serif;font-size:36pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;</span></div><div><span><br/></span></div></div><div style="text-align:center"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">SIGNATURES</span></div><div style="text-align:center"><span><br/></span></div><div style="margin-bottom:16pt;text-indent:31.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</span></div><div style="margin-bottom:16pt;padding-left:198pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">W. R. BERKLEY CORPORATION</span></div><div style="padding-left:252pt"><span><br/></span></div><div style="padding-left:252pt"><span><br/></span></div><div style="margin-top:5pt;padding-left:252pt;text-indent:-54pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:53.894%"><tr><td style="width:1.0%"/><td style="width:8.437%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.217%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:74.046%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">By:</span></td><td colspan="6" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">/s/ Richard M. Baio</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Name:</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Richard M. Baio</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Title:</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Executive Vice President-</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:100%">Chief Financial Officer</span></td></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr></table></div><div style="padding-left:252pt"><span><br/></span></div><div style="padding-left:252pt"><span><br/></span></div><div style="padding-left:252pt"><span><br/></span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">Date:  June&#160;13, 2025 </span></div><div style="margin-bottom:16pt;padding-left:103.5pt;text-indent:-101.25pt"><span><br/></span></div><div style="margin-bottom:16pt"><span><br/></span></div><div style="margin-bottom:16pt"><span><br/></span></div><div style="height:36pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div></body></html>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-3.1
<SEQUENCE>2
<FILENAME>exhibit316132025.htm
<DESCRIPTION>EX-3.1
<TEXT>
<html><head>
<!-- Document created using Wdesk -->
<!-- Copyright 2025 Workiva -->
<title>Document</title></head><body><div id="ic3b42f0341264884a1489e61d3138a26_1"></div><div style="min-height:72pt;width:100%"><div><font><br></font></div></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">CERTIFICATE OF AMENDMENT</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">OF</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">RESTATED CERTIFICATE OF INCORPORATION</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">OF</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">W. R. BERKLEY CORPORATION</font></div><div><font><br></font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;The undersigned, being the Chief Executive Officer of W. R. BERKLEY CORPORATION, a corporation existing under the laws of the State of Delaware, hereby certifies that&#58;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;1.&#160;&#160;&#160;&#160;The first paragraph of Article Fourth of the Restated Certificate of Incorporation of said corporation be and it hereby is amended to read as follows&#58;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;FOURTH&#58;&#160;&#160;&#160;&#160;The aggregate number of shares of capital stock of all classes which the Corporation shall have authority to issue is one billion eight hundred eighty million (1,880,000,000) shares, of which one billion eight hundred seventy five million (1,875,000,000) shares are to be Common Stock of the par value of twenty cents ($.20) each, and five million (5,000,000) shares are to be Preferred Stock of the par value of ten cents ($.10) each.</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;2.&#160;&#160;&#160;&#160;The amendment was duly adopted in accordance with the provisions of Section 242 of the General Corporation Law of the State of Delaware.</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;IN WITNESS WHEREOF, I have signed this certificate this 11th day of June, 2025.</font></div><div><font><br></font></div><div><font><br></font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%;text-decoration:underline">&#47;s&#47; W. Robert Berkley, Jr.</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;W. Robert Berkley, Jr.</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Chief Executive Officer</font></div><div><font><br></font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">Attest&#58;</font></div><div><font><br></font></div><div><font><br></font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%;text-decoration:underline">&#47;s&#47; Philip S. Welt</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%">Philip S. Welt, Secretary</font></div><div><font><br></font></div><div style="height:72pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div></body></html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>3
<FILENAME>wrb-20250611.xsd
<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:41518ec6-8899-4ea8-b70e-7a5ea6dfb4c2,g:10e4460f-4968-41d1-be42-276db11ca60b-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:wrb="http://www.wrberkley.com/20250611" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.wrberkley.com/20250611">
  <xs:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wrb-20250611_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wrb-20250611_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wrb-20250611_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.wrberkley.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="wrb_SubordinatedDebenturesDue20535.625Member" abstract="true" name="SubordinatedDebenturesDue20535.625Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wrb_SubordinatedDebenturesDue20565.9Member" abstract="true" name="SubordinatedDebenturesDue20565.9Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wrb_SubordinatedDebenturesDue20565.75Member" abstract="true" name="SubordinatedDebenturesDue20565.75Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wrb_SubordinatedDebenturesDue20585.70Member" abstract="true" name="SubordinatedDebenturesDue20585.70Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wrb_SubordinatedDebenturesDue20595.10Member" abstract="true" name="SubordinatedDebenturesDue20595.10Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.DEF
<SEQUENCE>4
<FILENAME>wrb-20250611_def.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:41518ec6-8899-4ea8-b70e-7a5ea6dfb4c2,g:10e4460f-4968-41d1-be42-276db11ca60b-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.wrberkley.com/role/CoverPage" xlink:type="simple" xlink:href="wrb-20250611.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.wrberkley.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_9fcae7e3-350d-4949-97da-09edf353a660" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntitiesTable_9fcae7e3-350d-4949-97da-09edf353a660" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_12bbb3d0-2c6f-4992-a490-f60196407d95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_9fcae7e3-350d-4949-97da-09edf353a660" xlink:to="loc_us-gaap_DebtInstrumentAxis_12bbb3d0-2c6f-4992-a490-f60196407d95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_12bbb3d0-2c6f-4992-a490-f60196407d95_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_12bbb3d0-2c6f-4992-a490-f60196407d95" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_12bbb3d0-2c6f-4992-a490-f60196407d95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_12bbb3d0-2c6f-4992-a490-f60196407d95" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20535.625Member_e2ac5766-d116-408c-bd71-d87b88711ab6" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20535.625Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20535.625Member_e2ac5766-d116-408c-bd71-d87b88711ab6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20565.9Member_5bce34dc-b4f7-43dd-8765-c1d9ba891992" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20565.9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20565.9Member_5bce34dc-b4f7-43dd-8765-c1d9ba891992" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20565.75Member_d66b3b18-2351-401f-a84c-508d06d81acc" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20565.75Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20565.75Member_d66b3b18-2351-401f-a84c-508d06d81acc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20585.70Member_e1a907f0-4a0c-40d1-bd20-7002172d4877" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20585.70Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20585.70Member_e1a907f0-4a0c-40d1-bd20-7002172d4877" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20595.10Member_2b7c5565-2e71-4019-9730-8130edb23f73" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20595.10Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20595.10Member_2b7c5565-2e71-4019-9730-8130edb23f73" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_6c761f03-f5b2-4717-bdef-0c6763471c89" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_DocumentType_6c761f03-f5b2-4717-bdef-0c6763471c89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_22a59720-d277-4658-8715-1ed3fa20ccf7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_DocumentPeriodEndDate_22a59720-d277-4658-8715-1ed3fa20ccf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_d77a5e3e-016a-490d-aaaa-4950a2392fa7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityRegistrantName_d77a5e3e-016a-490d-aaaa-4950a2392fa7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_9b4dc4b5-7a81-4383-89f4-c667a844435e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityFileNumber_9b4dc4b5-7a81-4383-89f4-c667a844435e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_2a8589d3-b893-40eb-afc6-4451666914c9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityIncorporationStateCountryCode_2a8589d3-b893-40eb-afc6-4451666914c9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_908021d5-64d4-4704-a9ee-263cbc54b7d6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityTaxIdentificationNumber_908021d5-64d4-4704-a9ee-263cbc54b7d6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_0fcb5695-674f-497e-8a68-04a753692c99" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityAddressAddressLine1_0fcb5695-674f-497e-8a68-04a753692c99" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_b18d68ec-e271-4793-b667-14668aa214da" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityAddressCityOrTown_b18d68ec-e271-4793-b667-14668aa214da" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_ef245c5b-d5c2-44b4-8ffa-41c96f07c6df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityAddressStateOrProvince_ef245c5b-d5c2-44b4-8ffa-41c96f07c6df" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_72097ad1-316b-4857-a950-a3dd98937b61" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityAddressPostalZipCode_72097ad1-316b-4857-a950-a3dd98937b61" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_958f920b-34f1-4cde-942d-54afdc76bdfa" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_CityAreaCode_958f920b-34f1-4cde-942d-54afdc76bdfa" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_9e772380-b67a-4e33-9b75-df41b75fc20a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_LocalPhoneNumber_9e772380-b67a-4e33-9b75-df41b75fc20a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_dc1ee73b-26f2-4dde-8214-7bd786910682" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_WrittenCommunications_dc1ee73b-26f2-4dde-8214-7bd786910682" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_02ea3437-55af-44a8-a5b6-d098d435a5c2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_SolicitingMaterial_02ea3437-55af-44a8-a5b6-d098d435a5c2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_4f7595f5-fa0c-4b1e-bd1f-f00c51084243" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_PreCommencementTenderOffer_4f7595f5-fa0c-4b1e-bd1f-f00c51084243" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_3b21e545-7180-4631-89b4-5546f843b8a2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_3b21e545-7180-4631-89b4-5546f843b8a2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_97ed6283-a6b2-4801-86d8-652d741f9306" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_Security12bTitle_97ed6283-a6b2-4801-86d8-652d741f9306" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_7d8a6dd5-a288-4452-94e5-9c124c8ce855" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_TradingSymbol_7d8a6dd5-a288-4452-94e5-9c124c8ce855" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_de94452a-3276-45a3-90f4-de277adde2c1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_SecurityExchangeName_de94452a-3276-45a3-90f4-de277adde2c1" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_8a615c39-74d6-4b71-a10d-ffaa93bacbef" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityEmergingGrowthCompany_8a615c39-74d6-4b71-a10d-ffaa93bacbef" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_323a9421-19df-4df2-8a6c-8fb7120400be" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityCentralIndexKey_323a9421-19df-4df2-8a6c-8fb7120400be" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_9e4abc50-7444-4edd-b7e9-648086473d83" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_AmendmentFlag_9e4abc50-7444-4edd-b7e9-648086473d83" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>5
<FILENAME>wrb-20250611_lab.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:41518ec6-8899-4ea8-b70e-7a5ea6dfb4c2,g:10e4460f-4968-41d1-be42-276db11ca60b-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_dei_SolicitingMaterial_27270e50-d8ff-4c0d-a59c-0dc4080308d5_terseLabel_en-US" xlink:label="lab_dei_SolicitingMaterial" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Soliciting Material</link:label>
    <link:label id="lab_dei_SolicitingMaterial_label_en-US" xlink:label="lab_dei_SolicitingMaterial" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Soliciting Material</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SolicitingMaterial" xlink:to="lab_dei_SolicitingMaterial" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_WrittenCommunications_4f454082-6423-4b80-985c-529d2ff93b92_terseLabel_en-US" xlink:label="lab_dei_WrittenCommunications" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Written Communications</link:label>
    <link:label id="lab_dei_WrittenCommunications_label_en-US" xlink:label="lab_dei_WrittenCommunications" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Written Communications</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_WrittenCommunications" xlink:to="lab_dei_WrittenCommunications" xlink:type="arc" order="1"/>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20535.625Member_9cda2480-5cf1-464c-b901-96ed43afb91f_terseLabel_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20535.625Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5.700% Subordinated Debentures due 2058</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20535.625Member_label_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20535.625Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2053, 5.625% [Member]</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20535.625Member_documentation_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20535.625Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2053, 5.625% [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20535.625Member" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20535.625Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wrb_SubordinatedDebenturesDue20535.625Member" xlink:to="lab_wrb_SubordinatedDebenturesDue20535.625Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_LocalPhoneNumber_11995331-1601-4881-9262-f788a7dd5e8c_terseLabel_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Local Phone Number</link:label>
    <link:label id="lab_dei_LocalPhoneNumber_label_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Local Phone Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LocalPhoneNumber" xlink:to="lab_dei_LocalPhoneNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AmendmentFlag_a1411fac-4372-4d71-b601-b4950a0fef41_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:label id="lab_dei_AmendmentFlag_label_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag" xlink:to="lab_dei_AmendmentFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20565.9Member_8239f848-8599-432b-b3bf-fc8b8614f664_terseLabel_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20565.9Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5.100% Subordinated Debentures due 2059</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20565.9Member_label_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20565.9Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2056, 5.9% [Member]</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20565.9Member_documentation_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20565.9Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2056, 5.9% [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20565.9Member" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20565.9Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wrb_SubordinatedDebenturesDue20565.9Member" xlink:to="lab_wrb_SubordinatedDebenturesDue20565.9Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_9b049f17-b39e-405f-91f5-1ca9ad58b60f_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany" xlink:to="lab_dei_EntityEmergingGrowthCompany" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFileNumber_33e641f2-bccf-4bf3-9072-fb27902831dc_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:label id="lab_dei_EntityFileNumber_label_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber" xlink:to="lab_dei_EntityFileNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_SecurityExchangeName_3e162992-6959-4dbf-a7df-b2e54a1a4746_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Security Exchange Name</link:label>
    <link:label id="lab_dei_SecurityExchangeName_label_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Security Exchange Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SecurityExchangeName" xlink:to="lab_dei_SecurityExchangeName" xlink:type="arc" order="1"/>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20595.10Member_f1522fce-ca0a-4c9e-95f9-96655250f277_terseLabel_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20595.10Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5.10% Subordinated Debentures due 2059</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20595.10Member_label_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20595.10Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2059, 5.10% [Member]</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20595.10Member_documentation_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20595.10Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2059, 5.10% [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20595.10Member" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20595.10Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wrb_SubordinatedDebenturesDue20595.10Member" xlink:to="lab_wrb_SubordinatedDebenturesDue20595.10Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_d9fa8e4c-4c9b-4b06-9778-e744b2273757_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentAxis" xlink:to="lab_us-gaap_DebtInstrumentAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressStateOrProvince_2790ff0b-8f3e-42a0-8445-a55a8b69b23b_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:label id="lab_dei_EntityAddressStateOrProvince_label_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince" xlink:to="lab_dei_EntityAddressStateOrProvince" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressAddressLine1_eb3f88fc-48ee-4b46-98c4-1d35556b3ed9_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:label id="lab_dei_EntityAddressAddressLine1_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine1" xlink:to="lab_dei_EntityAddressAddressLine1" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CityAreaCode_a81eb738-f1b5-42b7-b413-e3578c92c354_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">City Area Code</link:label>
    <link:label id="lab_dei_CityAreaCode_label_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">City Area Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CityAreaCode" xlink:to="lab_dei_CityAreaCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CoverAbstract_1cc7b248-cba7-4b1c-b54c-cd47867554d6_terseLabel_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:label id="lab_dei_CoverAbstract_label_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CoverAbstract" xlink:to="lab_dei_CoverAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityInformationLineItems_49e3febb-ac47-48ef-a84b-4805cc9a9e7e_terseLabel_en-US" xlink:label="lab_dei_EntityInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Information [Line Items]</link:label>
    <link:label id="lab_dei_EntityInformationLineItems_label_en-US" xlink:label="lab_dei_EntityInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Information [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInformationLineItems" xlink:to="lab_dei_EntityInformationLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentPeriodEndDate_347a2d03-82c1-4383-a4e7-b07062708f68_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate" xlink:to="lab_dei_DocumentPeriodEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_PreCommencementTenderOffer_e91b66c5-cacf-4973-8a52-3b28041b064c_terseLabel_en-US" xlink:label="lab_dei_PreCommencementTenderOffer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
    <link:label id="lab_dei_PreCommencementTenderOffer_label_en-US" xlink:label="lab_dei_PreCommencementTenderOffer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_PreCommencementTenderOffer" xlink:to="lab_dei_PreCommencementTenderOffer" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCentralIndexKey_c23e209e-3e82-4a82-97b7-48fcadee3493_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey" xlink:to="lab_dei_EntityCentralIndexKey" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_PreCommencementIssuerTenderOffer_6f7de55c-40b5-47a7-b729-22b4e8056ff1_terseLabel_en-US" xlink:label="lab_dei_PreCommencementIssuerTenderOffer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
    <link:label id="lab_dei_PreCommencementIssuerTenderOffer_label_en-US" xlink:label="lab_dei_PreCommencementIssuerTenderOffer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_PreCommencementIssuerTenderOffer" xlink:to="lab_dei_PreCommencementIssuerTenderOffer" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityTaxIdentificationNumber_57d9232b-955e-4fde-be36-92708d2ec29c_terseLabel_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:label id="lab_dei_EntityTaxIdentificationNumber_label_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityTaxIdentificationNumber" xlink:to="lab_dei_EntityTaxIdentificationNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntitiesTable_032e6b34-861a-4fd9-a672-c66f63a50724_terseLabel_en-US" xlink:label="lab_dei_EntitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entities [Table]</link:label>
    <link:label id="lab_dei_EntitiesTable_label_en-US" xlink:label="lab_dei_EntitiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entities [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitiesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntitiesTable" xlink:to="lab_dei_EntitiesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityRegistrantName_b4203378-757e-4ab8-a71a-492e2ed806db_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_label_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName" xlink:to="lab_dei_EntityRegistrantName" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_TradingSymbol_a7c86fa9-b1c3-494a-85f1-ef41e844756d_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:label id="lab_dei_TradingSymbol_label_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol" xlink:to="lab_dei_TradingSymbol" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_244c2e9f-1eba-4d1a-855c-a9c63b3b65d3_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="lab_us-gaap_DebtInstrumentNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20565.75Member_9a1ad89e-75bf-4349-8860-c17ae597da0e_terseLabel_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20565.75Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.250% Subordinated Debentures due 2060</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20565.75Member_label_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20565.75Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2056, 5.75% [Member]</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20565.75Member_documentation_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20565.75Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2056, 5.75% [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20565.75Member" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20565.75Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wrb_SubordinatedDebenturesDue20565.75Member" xlink:to="lab_wrb_SubordinatedDebenturesDue20565.75Member" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityIncorporationStateCountryCode_0c7ec437-c443-4ee1-a868-31d04ca0d1b2_terseLabel_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:label id="lab_dei_EntityIncorporationStateCountryCode_label_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityIncorporationStateCountryCode" xlink:to="lab_dei_EntityIncorporationStateCountryCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_Security12bTitle_02b2b33e-8c92-482e-ae7f-7176ca30380c_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:label id="lab_dei_Security12bTitle_label_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle" xlink:to="lab_dei_Security12bTitle" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressPostalZipCode_a436f89f-a944-4d97-9d03-bc298584a874_terseLabel_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:label id="lab_dei_EntityAddressPostalZipCode_label_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressPostalZipCode" xlink:to="lab_dei_EntityAddressPostalZipCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCityOrTown_92a57fec-3b92-4079-a86b-7e0e87103351_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:label id="lab_dei_EntityAddressCityOrTown_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown" xlink:to="lab_dei_EntityAddressCityOrTown" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentType_fac9ef77-7a88-4b10-b878-f7e470daa491_terseLabel_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:label id="lab_dei_DocumentType_label_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentType" xlink:to="lab_dei_DocumentType" xlink:type="arc" order="1"/>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20585.70Member_23c549ce-d756-4438-bff2-74cadce741d8_terseLabel_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20585.70Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.125% Subordinated Debentures due 2061</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20585.70Member_label_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20585.70Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2058, 5.70% [Member]</link:label>
    <link:label id="lab_wrb_SubordinatedDebenturesDue20585.70Member_documentation_en-US" xlink:label="lab_wrb_SubordinatedDebenturesDue20585.70Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Subordinated Debentures Due 2058, 5.70% [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20585.70Member" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20585.70Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wrb_SubordinatedDebenturesDue20585.70Member" xlink:to="lab_wrb_SubordinatedDebenturesDue20585.70Member" xlink:type="arc" order="1"/>
  </link:labelLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>6
<FILENAME>wrb-20250611_pre.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
<TEXT>
<XBRL>
<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:41518ec6-8899-4ea8-b70e-7a5ea6dfb4c2,g:10e4460f-4968-41d1-be42-276db11ca60b-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.wrberkley.com/role/CoverPage" xlink:type="simple" xlink:href="wrb-20250611.xsd#CoverPage"/>
  <link:presentationLink xlink:role="http://www.wrberkley.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_bd52e870-5d8d-4dfe-a2f4-b943ed918ee2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_9fcae7e3-350d-4949-97da-09edf353a660" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitiesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_bd52e870-5d8d-4dfe-a2f4-b943ed918ee2" xlink:to="loc_dei_EntitiesTable_9fcae7e3-350d-4949-97da-09edf353a660" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_12bbb3d0-2c6f-4992-a490-f60196407d95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_9fcae7e3-350d-4949-97da-09edf353a660" xlink:to="loc_us-gaap_DebtInstrumentAxis_12bbb3d0-2c6f-4992-a490-f60196407d95" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_12bbb3d0-2c6f-4992-a490-f60196407d95" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20535.625Member_e2ac5766-d116-408c-bd71-d87b88711ab6" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20535.625Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20535.625Member_e2ac5766-d116-408c-bd71-d87b88711ab6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20565.9Member_5bce34dc-b4f7-43dd-8765-c1d9ba891992" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20565.9Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20565.9Member_5bce34dc-b4f7-43dd-8765-c1d9ba891992" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20565.75Member_d66b3b18-2351-401f-a84c-508d06d81acc" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20565.75Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20565.75Member_d66b3b18-2351-401f-a84c-508d06d81acc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20585.70Member_e1a907f0-4a0c-40d1-bd20-7002172d4877" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20585.70Member"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20585.70Member_e1a907f0-4a0c-40d1-bd20-7002172d4877" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_wrb_SubordinatedDebenturesDue20595.10Member_2b7c5565-2e71-4019-9730-8130edb23f73" xlink:href="wrb-20250611.xsd#wrb_SubordinatedDebenturesDue20595.10Member"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_481cf76f-dd36-4d16-b19d-03c7e5103917" xlink:to="loc_wrb_SubordinatedDebenturesDue20595.10Member_2b7c5565-2e71-4019-9730-8130edb23f73" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_9fcae7e3-350d-4949-97da-09edf353a660" xlink:to="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_6c761f03-f5b2-4717-bdef-0c6763471c89" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_DocumentType_6c761f03-f5b2-4717-bdef-0c6763471c89" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_22a59720-d277-4658-8715-1ed3fa20ccf7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_DocumentPeriodEndDate_22a59720-d277-4658-8715-1ed3fa20ccf7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_d77a5e3e-016a-490d-aaaa-4950a2392fa7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityRegistrantName_d77a5e3e-016a-490d-aaaa-4950a2392fa7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_9b4dc4b5-7a81-4383-89f4-c667a844435e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityFileNumber_9b4dc4b5-7a81-4383-89f4-c667a844435e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_2a8589d3-b893-40eb-afc6-4451666914c9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityIncorporationStateCountryCode_2a8589d3-b893-40eb-afc6-4451666914c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_908021d5-64d4-4704-a9ee-263cbc54b7d6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityTaxIdentificationNumber_908021d5-64d4-4704-a9ee-263cbc54b7d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_0fcb5695-674f-497e-8a68-04a753692c99" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityAddressAddressLine1_0fcb5695-674f-497e-8a68-04a753692c99" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_b18d68ec-e271-4793-b667-14668aa214da" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityAddressCityOrTown_b18d68ec-e271-4793-b667-14668aa214da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_ef245c5b-d5c2-44b4-8ffa-41c96f07c6df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityAddressStateOrProvince_ef245c5b-d5c2-44b4-8ffa-41c96f07c6df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_72097ad1-316b-4857-a950-a3dd98937b61" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityAddressPostalZipCode_72097ad1-316b-4857-a950-a3dd98937b61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_958f920b-34f1-4cde-942d-54afdc76bdfa" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_CityAreaCode_958f920b-34f1-4cde-942d-54afdc76bdfa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_9e772380-b67a-4e33-9b75-df41b75fc20a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_LocalPhoneNumber_9e772380-b67a-4e33-9b75-df41b75fc20a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_dc1ee73b-26f2-4dde-8214-7bd786910682" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_WrittenCommunications_dc1ee73b-26f2-4dde-8214-7bd786910682" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_02ea3437-55af-44a8-a5b6-d098d435a5c2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_SolicitingMaterial_02ea3437-55af-44a8-a5b6-d098d435a5c2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_4f7595f5-fa0c-4b1e-bd1f-f00c51084243" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_PreCommencementTenderOffer_4f7595f5-fa0c-4b1e-bd1f-f00c51084243" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_3b21e545-7180-4631-89b4-5546f843b8a2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_3b21e545-7180-4631-89b4-5546f843b8a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_97ed6283-a6b2-4801-86d8-652d741f9306" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_Security12bTitle_97ed6283-a6b2-4801-86d8-652d741f9306" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_7d8a6dd5-a288-4452-94e5-9c124c8ce855" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_TradingSymbol_7d8a6dd5-a288-4452-94e5-9c124c8ce855" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_de94452a-3276-45a3-90f4-de277adde2c1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_SecurityExchangeName_de94452a-3276-45a3-90f4-de277adde2c1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_8a615c39-74d6-4b71-a10d-ffaa93bacbef" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityEmergingGrowthCompany_8a615c39-74d6-4b71-a10d-ffaa93bacbef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_323a9421-19df-4df2-8a6c-8fb7120400be" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_EntityCentralIndexKey_323a9421-19df-4df2-8a6c-8fb7120400be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_9e4abc50-7444-4edd-b7e9-648086473d83" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_13e39ad9-ebfa-45da-95ca-fea67ab1b484" xlink:to="loc_dei_AmendmentFlag_9e4abc50-7444-4edd-b7e9-648086473d83" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>8
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.25.1</span><table class="report" border="0" cellspacing="2" id="id2">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Cover Page<br></strong></div></th>
<th class="th"><div>Jun. 11, 2025</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityInformationLineItems', window );"><strong>Entity Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">8-K<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Jun. 11,  2025<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">W. R. BERKLEY CORP<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity File Number</a></td>
<td class="text">1-15202<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">DE<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">22-1867895<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">475 Steamboat Road<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">Greenwich<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">CT<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">06830<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">(203)<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">629-3000<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Stock, par value $.20 per share<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">WRB<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0000011544<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20535.625Member', window );">5.700% Subordinated Debentures due 2058</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityInformationLineItems', window );"><strong>Entity Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">5.700% Subordinated Debentures due 2058<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">WRB-PE<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20565.9Member', window );">5.100% Subordinated Debentures due 2059</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityInformationLineItems', window );"><strong>Entity Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">5.100% Subordinated Debentures due 2059<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">WRB-PF<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20565.75Member', window );">4.250% Subordinated Debentures due 2060</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityInformationLineItems', window );"><strong>Entity Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">4.250% Subordinated Debentures due 2060<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">WRB-PG<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20585.70Member', window );">4.125% Subordinated Debentures due 2061</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityInformationLineItems', window );"><strong>Entity Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">4.125% Subordinated Debentures due 2061<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">WRB-PH<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityInformationLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>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.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityInformationLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SolicitingMaterial">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14a<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_WrittenCommunications">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_WrittenCommunications</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20535.625Member">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20535.625Member</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20565.9Member">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20565.9Member</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20565.75Member">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20565.75Member</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20585.70Member">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_DebtInstrumentAxis=wrb_SubordinatedDebenturesDue20585.70Member</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>9
<FILENAME>Show.js
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
// Edgar(tm) Renderer was created by staff of the U.S. Securities and Exchange Commission.  Data and content created by government employees within the scope of their employment are not subject to domestic copyright protection. 17 U.S.C. 105.
var Show={};Show.LastAR=null,Show.showAR=function(a,r,w){if(Show.LastAR)Show.hideAR();var e=a;while(e&&e.nodeName!='TABLE')e=e.nextSibling;if(!e||e.nodeName!='TABLE'){var ref=((window)?w.document:document).getElementById(r);if(ref){e=ref.cloneNode(!0);
e.removeAttribute('id');a.parentNode.appendChild(e)}}
if(e)e.style.display='block';Show.LastAR=e};Show.hideAR=function(){Show.LastAR.style.display='none'};Show.toggleNext=function(a){var e=a;while(e.nodeName!='DIV')e=e.nextSibling;if(!e.style){}else if(!e.style.display){}else{var d,p_;if(e.style.display=='none'){d='block';p='-'}else{d='none';p='+'}
e.style.display=d;if(a.textContent){a.textContent=p+a.textContent.substring(1)}else{a.innerText=p+a.innerText.substring(1)}}}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>10
<FILENAME>report.css
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
/* Updated 2009-11-04 */
/* v2.2.0.24 */

/* DefRef Styles */
.report table.authRefData{
	background-color: #def;
	border: 2px solid #2F4497;
	font-size: 1em;
	position: absolute;
}

.report table.authRefData a {
	display: block;
	font-weight: bold;
}

.report table.authRefData p {
	margin-top: 0px;
}

.report table.authRefData .hide {
	background-color: #2F4497;
	padding: 1px 3px 0px 0px;
	text-align: right;
}

.report table.authRefData .hide a:hover {
	background-color: #2F4497;
}

.report table.authRefData .body {
	height: 150px;
	overflow: auto;
	width: 400px;
}

.report table.authRefData table{
	font-size: 1em;
}

/* Report Styles */
.pl a, .pl a:visited {
	color: black;
	text-decoration: none;
}

/* table */
.report {
	background-color: white;
	border: 2px solid #acf;
	clear: both;
	color: black;
	font: normal 8pt Helvetica, Arial, san-serif;
	margin-bottom: 2em;
}

.report hr {
	border: 1px solid #acf;
}

/* Top labels */
.report th {
	background-color: #acf;
	color: black;
	font-weight: bold;
	text-align: center;
}

.report th.void	{
	background-color: transparent;
	color: #000000;
	font: bold 10pt Helvetica, Arial, san-serif;
	text-align: left;
}

.report .pl {
	text-align: left;
	vertical-align: top;
	white-space: normal;
	width: 200px;
	white-space: normal; /* word-wrap: break-word; */
}

.report td.pl a.a {
	cursor: pointer;
	display: block;
	width: 200px;
	overflow: hidden;
}

.report td.pl div.a {
	width: 200px;
}

.report td.pl a:hover {
	background-color: #ffc;
}

/* Header rows... */
.report tr.rh {
	background-color: #acf;
	color: black;
	font-weight: bold;
}

/* Calendars... */
.report .rc {
	background-color: #f0f0f0;
}

/* Even rows... */
.report .re, .report .reu {
	background-color: #def;
}

.report .reu td {
	border-bottom: 1px solid black;
}

/* Odd rows... */
.report .ro, .report .rou {
	background-color: white;
}

.report .rou td {
	border-bottom: 1px solid black;
}

.report .rou table td, .report .reu table td {
	border-bottom: 0px solid black;
}

/* styles for footnote marker */
.report .fn {
	white-space: nowrap;
}

/* styles for numeric types */
.report .num, .report .nump {
	text-align: right;
	white-space: nowrap;
}

.report .nump {
	padding-left: 2em;
}

.report .nump {
	padding: 0px 0.4em 0px 2em;
}

/* styles for text types */
.report .text {
	text-align: left;
	white-space: normal;
}

.report .text .big {
	margin-bottom: 1em;
	width: 17em;
}

.report .text .more {
	display: none;
}

.report .text .note {
	font-style: italic;
	font-weight: bold;
}

.report .text .small {
	width: 10em;
}

.report sup {
	font-style: italic;
}

.report .outerFootnotes {
	font-size: 1em;
}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>12
<FILENAME>FilingSummary.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<XML>
<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>5</ContextCount>
  <ElementCount>22</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>4</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>0</UnitCount>
  <MyReports>
    <Report instance="wrb-20250611.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.wrberkley.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="8-K" isOnlyDei="true" isUsgaap="true" original="wrb-20250611.htm">wrb-20250611.htm</File>
    <File>wrb-20250611.xsd</File>
    <File>wrb-20250611_def.xml</File>
    <File>wrb-20250611_lab.xml</File>
    <File>wrb-20250611_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="34">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>JSON
<SEQUENCE>14
<FILENAME>MetaLinks.json
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
{
 "version": "2.2",
 "instance": {
  "wrb-20250611.htm": {
   "nsprefix": "wrb",
   "nsuri": "http://www.wrberkley.com/20250611",
   "dts": {
    "inline": {
     "local": [
      "wrb-20250611.htm"
     ]
    },
    "schema": {
     "local": [
      "wrb-20250611.xsd"
     ],
     "remote": [
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd",
      "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd",
      "https://www.xbrl.org/dtr/type/2024-01-31/types.xsd",
      "https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd",
      "https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd",
      "https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd",
      "https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd",
      "https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd",
      "https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd",
      "https://xbrl.sec.gov/country/2025/country-2025.xsd",
      "https://xbrl.sec.gov/dei/2025/dei-2025.xsd",
      "https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd"
     ]
    },
    "definitionLink": {
     "local": [
      "wrb-20250611_def.xml"
     ]
    },
    "labelLink": {
     "local": [
      "wrb-20250611_lab.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "wrb-20250611_pre.xml"
     ]
    }
   },
   "keyStandard": 22,
   "keyCustom": 0,
   "axisStandard": 1,
   "axisCustom": 0,
   "memberStandard": 0,
   "memberCustom": 4,
   "hidden": {
    "total": 2,
    "http://xbrl.sec.gov/dei/2025": 2
   },
   "contextCount": 5,
   "entityCount": 1,
   "segmentCount": 4,
   "elementCount": 32,
   "unitCount": 0,
   "baseTaxonomies": {
    "http://xbrl.sec.gov/dei/2025": 34
   },
   "report": {
    "R1": {
     "role": "http://www.wrberkley.com/role/CoverPage",
     "longName": "0000001 - Document - Cover Page",
     "shortName": "Cover Page",
     "isDefault": "true",
     "groupType": "document",
     "subGroupType": "",
     "menuCat": "Cover",
     "order": "1",
     "firstAnchor": {
      "contextRef": "c-1",
      "name": "dei:DocumentType",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "wrb-20250611.htm",
      "first": true,
      "unique": true
     },
     "uniqueAnchor": {
      "contextRef": "c-1",
      "name": "dei:DocumentType",
      "unitRef": null,
      "xsiNil": "false",
      "lang": "en-US",
      "decimals": null,
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "reportCount": 1,
      "baseRef": "wrb-20250611.htm",
      "first": true,
      "unique": true
     }
    }
   },
   "tag": {
    "dei_AmendmentFlag": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "AmendmentFlag",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Amendment Flag",
        "label": "Amendment Flag",
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission."
       }
      }
     },
     "auth_ref": []
    },
    "dei_CityAreaCode": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "CityAreaCode",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "City Area Code",
        "label": "City Area Code",
        "documentation": "Area code of city"
       }
      }
     },
     "auth_ref": []
    },
    "dei_CoverAbstract": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "CoverAbstract",
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Cover [Abstract]",
        "label": "Cover [Abstract]",
        "documentation": "Cover page."
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DebtInstrumentAxis": {
     "xbrltype": "stringItemType",
     "nsuri": "http://fasb.org/us-gaap/2025",
     "localname": "DebtInstrumentAxis",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt Instrument [Axis]",
        "label": "Debt Instrument [Axis]"
       }
      }
     },
     "auth_ref": []
    },
    "us-gaap_DebtInstrumentNameDomain": {
     "xbrltype": "domainItemType",
     "nsuri": "http://fasb.org/us-gaap/2025",
     "localname": "DebtInstrumentNameDomain",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Debt Instrument, Name [Domain]",
        "label": "Debt Instrument, Name [Domain]"
       }
      }
     },
     "auth_ref": []
    },
    "dei_DocumentPeriodEndDate": {
     "xbrltype": "dateItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "DocumentPeriodEndDate",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Period End Date",
        "label": "Document Period End Date",
        "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD."
       }
      }
     },
     "auth_ref": []
    },
    "dei_DocumentType": {
     "xbrltype": "submissionTypeItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "DocumentType",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Document Type",
        "label": "Document Type",
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntitiesTable": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntitiesTable",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entities [Table]",
        "label": "Entities [Table]",
        "documentation": "Container to assemble all relevant information about each entity associated with the document instance"
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityAddressAddressLine1": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityAddressAddressLine1",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Address, Address Line One",
        "label": "Entity Address, Address Line One",
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name"
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityAddressCityOrTown": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityAddressCityOrTown",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Address, City or Town",
        "label": "Entity Address, City or Town",
        "documentation": "Name of the City or Town"
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityAddressPostalZipCode": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityAddressPostalZipCode",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Address, Postal Zip Code",
        "label": "Entity Address, Postal Zip Code",
        "documentation": "Code for the postal or zip code"
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityAddressStateOrProvince": {
     "xbrltype": "stateOrProvinceItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityAddressStateOrProvince",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Address, State or Province",
        "label": "Entity Address, State or Province",
        "documentation": "Name of the state or province."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityCentralIndexKey": {
     "xbrltype": "centralIndexKeyItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityCentralIndexKey",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Central Index Key",
        "label": "Entity Central Index Key",
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK."
       }
      }
     },
     "auth_ref": [
      "r1"
     ]
    },
    "dei_EntityEmergingGrowthCompany": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityEmergingGrowthCompany",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Emerging Growth Company",
        "label": "Entity Emerging Growth Company",
        "documentation": "Indicate if registrant meets the emerging growth company criteria."
       }
      }
     },
     "auth_ref": [
      "r1"
     ]
    },
    "dei_EntityFileNumber": {
     "xbrltype": "fileNumberItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityFileNumber",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity File Number",
        "label": "Entity File Number",
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityIncorporationStateCountryCode": {
     "xbrltype": "edgarStateCountryItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityIncorporationStateCountryCode",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Incorporation, State or Country Code",
        "label": "Entity Incorporation, State or Country Code",
        "documentation": "Two-character EDGAR code representing the state or country of incorporation."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityInformationLineItems": {
     "xbrltype": "stringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityInformationLineItems",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Information [Line Items]",
        "label": "Entity Information [Line Items]",
        "documentation": "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."
       }
      }
     },
     "auth_ref": []
    },
    "dei_EntityRegistrantName": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityRegistrantName",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Registrant Name",
        "label": "Entity Registrant Name",
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC."
       }
      }
     },
     "auth_ref": [
      "r1"
     ]
    },
    "dei_EntityTaxIdentificationNumber": {
     "xbrltype": "employerIdItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "EntityTaxIdentificationNumber",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Entity Tax Identification Number",
        "label": "Entity Tax Identification Number",
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS."
       }
      }
     },
     "auth_ref": [
      "r1"
     ]
    },
    "dei_LocalPhoneNumber": {
     "xbrltype": "normalizedStringItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "LocalPhoneNumber",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Local Phone Number",
        "label": "Local Phone Number",
        "documentation": "Local phone number for entity."
       }
      }
     },
     "auth_ref": []
    },
    "dei_PreCommencementIssuerTenderOffer": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "PreCommencementIssuerTenderOffer",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Pre-commencement Issuer Tender Offer",
        "label": "Pre-commencement Issuer Tender Offer",
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act."
       }
      }
     },
     "auth_ref": [
      "r3"
     ]
    },
    "dei_PreCommencementTenderOffer": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "PreCommencementTenderOffer",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Pre-commencement Tender Offer",
        "label": "Pre-commencement Tender Offer",
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act."
       }
      }
     },
     "auth_ref": [
      "r5"
     ]
    },
    "dei_Security12bTitle": {
     "xbrltype": "securityTitleItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "Security12bTitle",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Title of 12(b) Security",
        "label": "Title of 12(b) Security",
        "documentation": "Title of a 12(b) registered security."
       }
      }
     },
     "auth_ref": [
      "r0"
     ]
    },
    "dei_SecurityExchangeName": {
     "xbrltype": "edgarExchangeCodeItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "SecurityExchangeName",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Security Exchange Name",
        "label": "Security Exchange Name",
        "documentation": "Name of the Exchange on which a security is registered."
       }
      }
     },
     "auth_ref": [
      "r2"
     ]
    },
    "dei_SolicitingMaterial": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "SolicitingMaterial",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Soliciting Material",
        "label": "Soliciting Material",
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act."
       }
      }
     },
     "auth_ref": [
      "r4"
     ]
    },
    "wrb_SubordinatedDebenturesDue20535.625Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.wrberkley.com/20250611",
     "localname": "SubordinatedDebenturesDue20535.625Member",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "5.700% Subordinated Debentures due 2058",
        "label": "Subordinated Debentures Due 2053, 5.625% [Member]",
        "documentation": "Subordinated Debentures Due 2053, 5.625% [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "wrb_SubordinatedDebenturesDue20565.75Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.wrberkley.com/20250611",
     "localname": "SubordinatedDebenturesDue20565.75Member",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "4.250% Subordinated Debentures due 2060",
        "label": "Subordinated Debentures Due 2056, 5.75% [Member]",
        "documentation": "Subordinated Debentures Due 2056, 5.75% [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "wrb_SubordinatedDebenturesDue20565.9Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.wrberkley.com/20250611",
     "localname": "SubordinatedDebenturesDue20565.9Member",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "5.100% Subordinated Debentures due 2059",
        "label": "Subordinated Debentures Due 2056, 5.9% [Member]",
        "documentation": "Subordinated Debentures Due 2056, 5.9% [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "wrb_SubordinatedDebenturesDue20585.70Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.wrberkley.com/20250611",
     "localname": "SubordinatedDebenturesDue20585.70Member",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "4.125% Subordinated Debentures due 2061",
        "label": "Subordinated Debentures Due 2058, 5.70% [Member]",
        "documentation": "Subordinated Debentures Due 2058, 5.70% [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "wrb_SubordinatedDebenturesDue20595.10Member": {
     "xbrltype": "domainItemType",
     "nsuri": "http://www.wrberkley.com/20250611",
     "localname": "SubordinatedDebenturesDue20595.10Member",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "5.10% Subordinated Debentures due 2059",
        "label": "Subordinated Debentures Due 2059, 5.10% [Member]",
        "documentation": "Subordinated Debentures Due 2059, 5.10% [Member]"
       }
      }
     },
     "auth_ref": []
    },
    "dei_TradingSymbol": {
     "xbrltype": "tradingSymbolItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "TradingSymbol",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Trading Symbol",
        "label": "Trading Symbol",
        "documentation": "Trading symbol of an instrument as listed on an exchange."
       }
      }
     },
     "auth_ref": []
    },
    "dei_WrittenCommunications": {
     "xbrltype": "booleanItemType",
     "nsuri": "http://xbrl.sec.gov/dei/2025",
     "localname": "WrittenCommunications",
     "presentation": [
      "http://www.wrberkley.com/role/CoverPage"
     ],
     "lang": {
      "en-us": {
       "role": {
        "terseLabel": "Written Communications",
        "label": "Written Communications",
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act."
       }
      }
     },
     "auth_ref": [
      "r6"
     ]
    }
   }
  }
 },
 "std_ref": {
  "r0": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "12",
   "Subsection": "b"
  },
  "r1": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r2": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r3": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "13e",
   "Subsection": "4c"
  },
  "r4": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "14a",
   "Subsection": "12"
  },
  "r5": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Exchange Act",
   "Number": "240",
   "Section": "14d",
   "Subsection": "2b"
  },
  "r6": {
   "role": "http://www.xbrl.org/2003/role/presentationRef",
   "Publisher": "SEC",
   "Name": "Securities Act",
   "Number": "230",
   "Section": "425"
  }
 }
}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>ZIP
<SEQUENCE>15
<FILENAME>0000011544-25-000013-xbrl.zip
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
begin 644 0000011544-25-000013-xbrl.zip
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M\0"N?^F/;N@[>VC^,S1\/'CV)D[ZTQEQO8%/( ]'O?'D=CRYG@W'HV?OQ0F
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MUL-56&F7-<F85CX5>7A=U+-LL)<MM_-W_U9;H3N _W22KM_X?U!+ P04
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MQX BA ''F%.1,0%3X==*=P.-TU:OL)]'#;J)4+3&]^VR=X3+M>/N'X2@[CN
M?T SOI]<C\9\A^&1F_3]]+8;]@/C>PIV]=^[8JZ2B1*IIE2;9$F54:M )EE2
MB4"2IQCC3*0J9T%J;:.,+-75A\AB1Q_FH4K=B).G3$/9]].H,_%PB781ZZ_/
M#:O?1IQ=Q'8JLW.PORS/K<5*\?,R5Q-.$R5(2H%.!#9Y4Q @4)("E6)")8,R
MQ4X/SY\:/K+XSIL[T&!%%LQ=:AO<#ZLKE)&?H!S)>,FGR_,@Q6P8&DTD7>ZW
M=='Y\P IE%]4]5J8 I7+>I)(201$%$C!B<E*B00"FXY.YHC0C&",<N=UY0W+
MQQ:#Q3)MS K-L6?;YN^@AU!6GH)P)>0GB2[GPS2Q86D\4701V%!%YX#0PNWM
MW.Y";Y;";,IY6ZO98H*82K42 G")B"W?-. 4"?,IQE(RSA11?I5;%\PXI5L+
M.?K<5"\-N(=^]@3*M73K2S^H=O-F'E"Z[2/6HW;K-#MR\;:/VG;UMG>TOSC7
M!T@\[)E^8_JU28H(AWF< @IE E!*4\"1,L5<3.(,DICJC+KJLA/AV*N/ZV,Q
MEJ"108TLK+L6N^-R6(:]V7JN/OH2]9+>7C)!JNNV.)K@]A)J:VW_0'^9?:R4
MW5.HC(?6[*7=XUY]T%I5$\42D642 \GM:SN,&-5Q#$$J((U1(N(,.;^VLQOF
MR((SP$"VD*,E=-1@NZMN3Y@.2V\8\G[Z"^/M)<+#M(*4N,?L:'(\3*VM28?1
MH<7IN;%7\>E;8_'^/^KK1,)4P9@ID"H* >+F'T:$K5"UY+E2*6*I7UWZ!&&<
MDG0%&C6HD8'UK46?QL6U#.W!-J@"=2<:4'KN(-.CZGQJ<>2"<P>A[5ISU\#>
M^>_M8G&KJO;TGFF2*XPE0+%=.23<%)L$,@"A0,IT@YG6SEO4#H&-G0N7#@R3
M$K<CYYT8>\6C9WKT"46?++F3XQ"Y<MOXM\J8.VGNR9N[KPG-GI?\_FUN+!=Z
M=6+&ZD5L3'(&[08ZAK$"2.<*")5F@-D.,H=*0N;Y0OH.I'&RJ0&/-M$#WU7?
M%2_7[#I %(*RK'\  K+M 7(]LNXNRR-GWP,$M[/PH0L"95NHQ2474S6)4Z@R
MD2) LX1;F3+ ,P*!S#*=I1S'!#H_M-NP/(8L#5;TN4'S76A]X.\HNQ!6 3)S
M(>0OJZ?.A\OHP=*XLGE*8$LF6P-"L]DG=5789Q[SNMD*(1",TY100# Q28P+
M"CBQ.F%00973.,L]7P7;!!@G=SUB>FX/Z8R):Z(*9QJ4GUQ)!F2E;B8]DM$3
M@R/GH&XZVZEGQSA_:5U6W)YA??%U)LKIA!-),\T9$(E,C9(0!Q3K!-AS2!1%
MB. L=]74AN4CBVF%%2W!W$6TR?ZP>H(Y^<G&D8Z77#I=#]+)IJ71!-))H*V,
M[@%#O/EO-?:FG/%B/H$(2:B8!HD2)M?DB54(EH SF:4B%1G.G18@#P$=^SG<
MYLOQSYMY.?J\Q.ZU&Z 5J_UZ&C("?O(*)-]SA\ VLZ/L$VC!?,/= MMD]^\9
MZ!@_^$%"Y.%(3Y[PG#)E*D>A 4H1 Y1F,9 )X0HSDO/8Z>46#\PCRQF=0GQP
MKV,6#W90#AGF0,_  /FIW>5H'#+X<9[M( UVG%!(L(YWGI!3T(8\4.@I_? 3
MA<AW=9)G!S6/,X6V+@U_$5"6U4U9-7=*LSWDO+R=U]77YBWJ6!(E44J 1,BT
M!DHE@-.,@C3)8R1YG"?"^?1Q![QQNN\-%UK;D%:.>+YU[A)&UPY]L. $->R]
MXA+T$J$#VUYO$^ZS/_IKA0YDN]XO=+DL_.R5!(K+HK;+SE! D:8*V(TA %&H
M %=$ Y*03/(T3FGL_'3HJ?%CKP-8C*C440+_*?X5K=']#UUY",9AO?:AZ+DL
MX,DNZ+25IS1ZG;3R8&ST4U:>TN@Z865K3,^]CQ_+1<VG_RUNEENN4)IIRC3@
M#"& <D8 LV_N"@D9Q11Q2OR>WG3"C),G'S8!+K$C QZ4&SL#Y9H2^](/RH3>
MS,-W/W82Z[_]<=/LM]G_V$EMYP;([M$]Q6FWDGVH+LN[^81!CHE6$MB_F -0
M3)@M904@*E:4)'&:8N=7FG9@C"S+9FNAJ<\L=* F6_'Q%&08ZWYJ="(<+L5M
M2OUUV++Y;42X36JG CN&AN]@N3273C273&E" .&4VDV7,1"44*")0B3..4?,
M67-MP\=>)U]OX[!8_IM4&NJ'Y11*R'/9VXE+T#Z4MN.]MI\TAD;?==)VOVNS
MR<;/AUV7IO:/,:W6"6$J,6)2@9S@#""44B"TAH @R7.I"$IRI\U='IA'7Y=.
M[%_\.; NG0RSY-H.9;]UZ<  #;HN39LEUL'/X&L':9AUZ<!@'65=VCUH@ZU+
M=] /7)=N6_HNUJ4[J+FN2W==NFOB;/^.WIE/KYZMOU,L_U[WJV?_!U!+ P04
M    " "+B<U:T*M+F),(  ")10  %    '=R8BTR,#(U,#8Q,5]P<F4N>&UL
MW9QM<]-($L??\RE\N;?7\3P_4 M;7&"O4@>[*<C6;MT;USST)"IL*R4K)/GV
MUU)B0B L7LN4;7@1V_)(/?V?GV:Z6V-^^OEZ-AU]P&91U?-G!_R0'8QPGNI<
MS<^>'?Q^^@NX@Y^?/WGRTS\ _OSWV]>CEW6ZG.&\'1TU&%K,HZNJ/1^UYSCZ
MHV[>5Q_"Z&0:VE(W,X#G_6E']<5-4YV=MR/!A%XV6W[;/%5<<X?)@'/>@\+@
M(%J&8(/&8'*)*HE_G3WE#)4RK(#RQH'BF4-$)4!8DR/G*1@6^XM.J_G[I]V?
M&!8X(O?FB_[CLX/SMKUX.AY?75T=7L=F>E@W9V/!F!PO6Q_<-;_^HOV5[%MS
M[_VX__9CTT7U6$.Z+!__^>;UNW2.LP#5?-&&>>H,+*JGB_[@ZSJ%ME?]F_T:
M?;5%]PF6S: [!%R Y(?7BWSP_,EH="M'4T_Q+991]_K[V^.'/6XB-N^G>'.8
MZMFX:S$^JHF(DW#6];<_O[VYP&<'BVIV,?UX[+S!\NR SH9N7)GAO=%_WI\[
MOK=_T>""H.G]?4T'[B[1&5NS+WC=XCSCK9-+,],Z/6@T[22NF^69TQ!QVA^=
M9*PF_95?Q$7;A-1.8M8"G66@L\N@<D$(HBB(7DG,GA!%\=#UKM\+ZG@_(@M,
MAV?UAS%=>-SIT;WIA>E%^<+<K3CK]?O5O*W:"A>G(4YQXDL*:%&"U(SZ[94'
M;W, YC$7J64PA@WJ]P-S#_O]Z;"^:-*H;C(V-(LL[84F?3'$#_F]:S&^" U=
M"-)Y-<W+LTM3SS8Q6FV]">UN1X;Z>S BMPLV#>;7MP/S5>]ZUUJ:7+%ON>Z@
M7R[@+(2+R4N,[3'-)$T_ [^XKA83+F*,,C,0R713HQ<0E&=0#./>*&:SUW\Q
M^B4L8M_=.Q.W"."T72R/W+/P]5YL#XH!PUEO5-N=H^/7,,.7]2Q4\XER/!5+
M+N0L#=TKW$#D/@.3R:+F3'INORLC]WW9#BF;&N._1&9-P;<(#BVVDW>7D52O
MYETH1_Z0'Y<T*"\O43 M]:$1^@W.:$V>H A)6V,@<W)',9<@9LLA.QN=LYR'
M:+X1&?P=>[L$RKHC6W]GF7<8':,/_9U'.B:4*I,?JEA0,F=PUFA(//L8G*>0
M6@P$Y][:2MB('P*;-27>;6CL\C[(QD09N0,A-:?[@!<(3B70S&5FLN,AI>'4
MV+\SV\@?!9NU1-YA;ARYQ);S)P^>V<) !9;(I:Y*D 4#RYC@5F3EK!W(S2?F
M5N)&_1#<K"OR#G/C]2%?NB2B39IN#A!H^UNA2QTD \<EPQR%+%8.Y.83<RMQ
MHW\(;M85>8O<?$PL;X[G72%S6;7"XQ9GE#)(E#YD#QA+ *4IP?0Z!2@8C V1
M1^740U36*;@\:GL[X<UF$NT-JKIE-I8E\%-J.S')&EZ8A**C &6YI;D0"[!D
MK)'T.3D_B(9/K6VYT+*!D:LW(...#/\)-E6=7\WS2YKW)D($[2TM@EE8BL&-
M=A2#<PT<LRQ!L$0SZT8X>&!VRQ/"]P%B?6%W8M%XBV=55Z6^75HGV78/LB0"
MXX;4\#1A!OI'[S0+0GI1PC P'K.ZG83F.W$Q6-:=P.*7:HJ_7O9QD(^4K*NH
MP09'<9!T$IPO"I(A'9Q22FK< !+W%K>3IWQ7'-:4<R=0.)ZGNKFHFUZ0=S00
M>%1?SMOFYJC.-.$%IYW/$J+SDJ)DC!!*HGA<:6Z,\5RE81'%"IW83H+R78'9
MG.@[P=!IN#[.I&55JMMM!,N;@3E*PK,&H[*B0(HI"!X1A)$I)JVBS68#]'S%
M_$K<F+WB9A-"[P0Q+W*F\5C<O73R\ DK*6KCR0FKNL=?%L$%XX"I8+4T7B2_
MB;GF$=,KD6+WBI2A N\2)4?T]K?FM+Z:3R)WV3A,@**KVEB:'R.MK,"5,2X$
MP54.FV/DWO!*A+A])&1-<7>)CWX!_:TY:>H/U3SA!(M0.ND(62?*WU54X$JG
M$$_>%&:3R65SD'QF?252_#Z2,D3F7<+EI%ZT8?J_ZJ(/MBB;]S9D#I*;",II
M2TNG9A!DSI[B+QL-WQPL#VRO5D%C^\C*^AIOF91N.GS18.C[[;4K7K (4A6:
M$%-&\$IDT"J4G*R)N0Q;;3ZUMAH-^U)075O'+8]_MQ%Z>G)>SS\F]&BMD([1
M4FA) )02?+0:<E&<7DL2;!@#GUM<C8-]J:,.TG/++/S15&V+\Z-Z-KN<WR5<
MBTE.'-'*2,E5H64O$\R.0B.P,5M'R3DS;MC>[$?-KD;%OE11ARN[933>U=,J
M56TU/WM#05%3A>F$"0Q220M:!\JN5' 0=#20F7=921TH2AK$Q9<V5X-B7VJI
M S7=,A$G#78X(T7&_8/$[@<AS6^%^C%1Q6JOBX;2;U&)'"%F7J PEC1G3@DE
M!Y'Q==NK$;(OQ=,-:;Q;I!PO%I?8?.J+C(*C5AHLIW52&<G!><JNM%:F."6C
M"\-FDF_U8#5J]J5TNE&]M[WN8+JDM?.&BWA:M=WN%XO9""<AF&ZO@F/4=Y,=
M&"VR5;QXR8:5V#^WN!H;^U(L':3GEEDX;4+WR]AW-[-83R<VNV!RUA"$<]VC
M(D$Y%FKPB0N57$*G_^K'5]\&X8&YU2C8EX+H^DKNR'3PZCJ=A_D9WNY&0-]U
M.H 4UI *@3(L5A1D%-8&BJI%&E;1>LSJ:D#L2]USL*X[4>]\-</FC+C^3U-?
MM>>T!EZ$^<V$X.8Z20]697(C6@Z!LPREA.!E#"GB)JKCCQI?;8O8?E4\AZN\
M$[ <D7Y-F!Y36'3]7[R92"&#5X(#][ET/VH6W</"!*Z0+X(IQN(F]@5]9G8U
M0/:E"#I<V2VC\8("YMP%S;],P]G$HPHQ:49,*P4*<X9HT8.A,,D9965VP_+8
M!^960V%?ZJ#K*[DQ!'X:?Z$D^?7^^9.[+[H_W?_<\?S)_P%02P$"% ,4
M" "+B<U:N++1?O@#   _%   %               @ $     97AH:6)I=#,Q
M-C$S,C R-2YH=&U02P$"% ,4    " "+B<U:CU_ZK2L6   5X@  $
M        @ $J!   =W)B+3(P,C4P-C$Q+FAT;5!+ 0(4 Q0    ( (N)S5H.
MP_P860,   T.   0              "  8,:  !W<F(M,C R-3 V,3$N>'-D
M4$L! A0#%     @ BXG-6CB)QR?7"   14(  !0              ( !"AX
M '=R8BTR,#(U,#8Q,5]D968N>&UL4$L! A0#%     @ BXG-6E$BR#7Y#0
M?WT  !0              ( !$R<  '=R8BTR,#(U,#8Q,5]L86(N>&UL4$L!
M A0#%     @ BXG-6M"K2YB3"   B44  !0              ( !/C4  '=R
H8BTR,#(U,#8Q,5]P<F4N>&UL4$L%!@     &  8 A $   ,^      $!

end
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>16
<FILENAME>wrb-20250611_htm.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<XML>
<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:us-gaap="http://fasb.org/us-gaap/2025"
  xmlns:wrb="http://www.wrberkley.com/20250611"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="wrb-20250611.xsd" xlink:type="simple"/>
    <context id="c-1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000011544</identifier>
        </entity>
        <period>
            <startDate>2025-06-11</startDate>
            <endDate>2025-06-11</endDate>
        </period>
    </context>
    <context id="c-2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000011544</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">wrb:SubordinatedDebenturesDue20535.625Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-06-11</startDate>
            <endDate>2025-06-11</endDate>
        </period>
    </context>
    <context id="c-3">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000011544</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">wrb:SubordinatedDebenturesDue20565.9Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-06-11</startDate>
            <endDate>2025-06-11</endDate>
        </period>
    </context>
    <context id="c-4">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000011544</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">wrb:SubordinatedDebenturesDue20565.75Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-06-11</startDate>
            <endDate>2025-06-11</endDate>
        </period>
    </context>
    <context id="c-5">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000011544</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">wrb:SubordinatedDebenturesDue20585.70Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-06-11</startDate>
            <endDate>2025-06-11</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey contextRef="c-1" id="f-33">0000011544</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag contextRef="c-1" id="f-34">false</dei:AmendmentFlag>
    <dei:DocumentType contextRef="c-1" id="f-1">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="c-1" id="f-2">2025-06-11</dei:DocumentPeriodEndDate>
    <dei:EntityFileNumber contextRef="c-1" id="f-3">1-15202</dei:EntityFileNumber>
    <dei:EntityRegistrantName contextRef="c-1" id="f-4">W. R. BERKLEY CORP</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode contextRef="c-1" id="f-5">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityTaxIdentificationNumber contextRef="c-1" id="f-6">22-1867895</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1 contextRef="c-1" id="f-7">475 Steamboat Road</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown contextRef="c-1" id="f-8">Greenwich</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="c-1" id="f-9">CT</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="c-1" id="f-10">06830</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="c-1" id="f-11">(203)</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="c-1" id="f-12">629-3000</dei:LocalPhoneNumber>
    <dei:WrittenCommunications contextRef="c-1" id="f-13">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="c-1" id="f-14">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="c-1" id="f-15">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="c-1" id="f-16">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle contextRef="c-1" id="f-17">Common Stock, par value $.20 per share</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="c-1" id="f-18">WRB</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="c-1" id="f-19">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle contextRef="c-2" id="f-20">5.700% Subordinated Debentures due 2058</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="c-2" id="f-21">WRB-PE</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="c-2" id="f-22">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle contextRef="c-3" id="f-23">5.100% Subordinated Debentures due 2059</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="c-3" id="f-24">WRB-PF</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="c-3" id="f-25">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle contextRef="c-4" id="f-26">4.250% Subordinated Debentures due 2060</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="c-4" id="f-27">WRB-PG</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="c-4" id="f-28">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle contextRef="c-5" id="f-29">4.125% Subordinated Debentures due 2061</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="c-5" id="f-30">WRB-PH</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="c-5" id="f-31">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany contextRef="c-1" id="f-32">false</dei:EntityEmergingGrowthCompany>
</xbrl>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
