<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>663</ContextCount>
  <ElementCount>245</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>61</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - Condensed Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/CondensedConsolidatedStatementsofComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/CondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/CondensedConsolidatedStatementsofCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - Condensed Consolidated Statements of Shareholders' Equity Condensed Consolidated Statements of Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/CondensedConsolidatedStatementsofShareholdersEquityCondensedConsolidatedStatementsofShareholdersEquity</Role>
      <ShortName>Condensed Consolidated Statements of Shareholders' Equity Condensed Consolidated Statements of Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/SignificantAccountingPolicies</Role>
      <ShortName>Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - Revenue Recognition (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.brunswick.com/role/RevenueRecognitionNotes</Role>
      <ShortName>Revenue Recognition (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Restructuring, Exit and Integration Activities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/RestructuringExitandIntegrationActivities</Role>
      <ShortName>Restructuring, Exit and Integration Activities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FinancialInstruments</Role>
      <ShortName>Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Goodwill and Intangibles</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/GoodwillandIntangibles</Role>
      <ShortName>Goodwill and Intangibles</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Segment Data</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/SegmentData</Role>
      <ShortName>Segment Data</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - Subsequent Event (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.brunswick.com/role/SubsequentEventNotes</Role>
      <ShortName>Subsequent Event (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/SignificantAccountingPoliciesPolicies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/SignificantAccountingPolicies</ParentRole>
      <Position>18</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - Revenue Recognition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/RevenueRecognitionTables</Role>
      <ShortName>Revenue Recognition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/RevenueRecognitionNotes</ParentRole>
      <Position>19</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Financial Instruments Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FinancialInstrumentsFinancialInstrumentsTables</Role>
      <ShortName>Financial Instruments Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/FairValueMeasurements</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/CommitmentsandContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/CommitmentsandContingencies</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Goodwill and Intangibles (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/GoodwillandIntangiblesTables</Role>
      <ShortName>Goodwill and Intangibles (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/GoodwillandIntangibles</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Segment Data (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/SegmentDataTables</Role>
      <ShortName>Segment Data (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/SegmentData</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Comprehensive Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/ComprehensiveIncomeTables</Role>
      <ShortName>Comprehensive Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/DebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/Debt</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Comprehensive Text Block List (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/ComprehensiveTextBlockListTables</Role>
      <ShortName>Comprehensive Text Block List (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/SignificantAccountingPoliciesDetails</Role>
      <ShortName>Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/SignificantAccountingPoliciesPolicies</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Revenue Recognition - Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/RevenueRecognitionDisaggregationofRevenueDetails</Role>
      <ShortName>Revenue Recognition - Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Revenue Recognition - Contracts with Customer (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/RevenueRecognitionContractswithCustomerDetails</Role>
      <ShortName>Revenue Recognition - Contracts with Customer (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Revenue Recognition - Performance Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/RevenueRecognitionPerformanceObligationsDetails</Role>
      <ShortName>Revenue Recognition - Performance Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - Acquisitions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/AcquisitionsDetails</Role>
      <ShortName>Acquisitions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Restructuring, Exit and Integration Activities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/RestructuringExitandIntegrationActivitiesDetails</Role>
      <ShortName>Restructuring, Exit and Integration Activities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/RestructuringExitandIntegrationActivities</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Financial Instruments Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FinancialInstrumentsFinancialInstrumentsDetails</Role>
      <ShortName>Financial Instruments Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/FinancialInstrumentsFinancialInstrumentsTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Financial Instruments, Fair Values of Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FinancialInstrumentsFairValuesofDerivativeInstrumentsDetails</Role>
      <ShortName>Financial Instruments, Fair Values of Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Financial Instruments, Condensed Consolidated Statements of Comprehensive Income, Effect of Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FinancialInstrumentsCondensedConsolidatedStatementsofComprehensiveIncomeEffectofDerivativeInstrumentsDetails</Role>
      <ShortName>Financial Instruments, Condensed Consolidated Statements of Comprehensive Income, Effect of Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Financial Instruments, Fair Value of Other Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FinancialInstrumentsFairValueofOtherFinancialInstrumentsDetails</Role>
      <ShortName>Financial Instruments, Fair Value of Other Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/FairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/FairValueMeasurementsTables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/CommitmentsandContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/CommitmentsandContingenciesTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Goodwill and Intangibles Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/GoodwillandIntangiblesGoodwillDetails</Role>
      <ShortName>Goodwill and Intangibles Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Goodwill and Intangibles Finite-Lived Intangibles (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/GoodwillandIntangiblesFiniteLivedIntangiblesDetails</Role>
      <ShortName>Goodwill and Intangibles Finite-Lived Intangibles (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Segment Data (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/SegmentDataDetails</Role>
      <ShortName>Segment Data (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/SegmentDataTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/ComprehensiveIncomeDetails</Role>
      <ShortName>Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/ComprehensiveIncomeTables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Comprehensive Income, Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/ComprehensiveIncomeReclassificationoutofAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Comprehensive Income, Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/IncomeTaxes</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/DebtDetails</Role>
      <ShortName>Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/DebtTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Comprehensive Text Block List (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/ComprehensiveTextBlockListDetails</Role>
      <ShortName>Comprehensive Text Block List (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/ComprehensiveTextBlockListTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="bcorp-20260704.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - Subsequent Event (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.brunswick.com/role/SubsequentEventDetails</Role>
      <ShortName>Subsequent Event (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.brunswick.com/role/SubsequentEventNotes</ParentRole>
      <Position>48</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="10-Q" isDefinitelyFs="true" isUsgaap="true" original="bcorp-20260704.htm">bcorp-20260704.htm</File>
    <File>bcorp-20260704.xsd</File>
    <File>bcorp-20260704_cal.xml</File>
    <File>bcorp-20260704_def.xml</File>
    <File>bcorp-20260704_lab.xml</File>
    <File>bcorp-20260704_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>bcorp-20260704_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1689">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="37">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
