<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>316</ContextCount>
  <ElementCount>325</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>83</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995200090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995200100 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/StatementCondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995200105 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/StatementCondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995200200 - Statement - Condensed Consolidated Statements of Net Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/StatementCondensedConsolidatedStatementsOfNetIncome</Role>
      <ShortName>Condensed Consolidated Statements of Net Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995200300 - Statement - Condensed Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995200400 - Statement - Condensed Consolidated Statements of Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/StatementCondensedConsolidatedStatementsOfEquity</Role>
      <ShortName>Condensed Consolidated Statements of Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995200500 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/StatementCondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995210101 - Disclosure - Basis of Presentation and Summary</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureBasisOfPresentationAndSummary</Role>
      <ShortName>Basis of Presentation and Summary</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995210201 - Disclosure - Reporting Currency</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureReportingCurrency</Role>
      <ShortName>Reporting Currency</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995210301 - Disclosure - New Accounting Standards</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureNewAccountingStandards</Role>
      <ShortName>New Accounting Standards</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995210401 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureRevenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995210501 - Disclosure - Accounts Receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureAccountsReceivable</Role>
      <ShortName>Accounts Receivable</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995210601 - Disclosure - Landfill Accounting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLandfillAccounting</Role>
      <ShortName>Landfill Accounting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995210701 - Disclosure - Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureAcquisitions</Role>
      <ShortName>Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995210801 - Disclosure - Intangible Assets, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureIntangibleAssetsNet</Role>
      <ShortName>Intangible Assets, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995210901 - Disclosure - Long-Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLongTermDebt</Role>
      <ShortName>Long-Term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995211001 - Disclosure - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureSegmentReporting</Role>
      <ShortName>Segment Reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995211101 - Disclosure - Derivative Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureDerivativeFinancialInstruments</Role>
      <ShortName>Derivative Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995211201 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureFairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995211301 - Disclosure - Net Income Per Share Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureNetIncomePerShareInformation</Role>
      <ShortName>Net Income Per Share Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995211401 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureFairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995211501 - Disclosure - Other Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureOtherComprehensiveIncomeLoss</Role>
      <ShortName>Other Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995211601 - Disclosure - Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureShareholdersEquity</Role>
      <ShortName>Shareholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995211701 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995211801 - Disclosure - Subsequent Event</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureSubsequentEvent</Role>
      <ShortName>Subsequent Event</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>99930403 - Disclosure - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureRevenueTables</Role>
      <ShortName>Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureRevenue</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>99930503 - Disclosure - Accounts Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureAccountsReceivableTables</Role>
      <ShortName>Accounts Receivable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureAccountsReceivable</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>99930603 - Disclosure - Landfill Accounting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLandfillAccountingTables</Role>
      <ShortName>Landfill Accounting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureLandfillAccounting</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>99930703 - Disclosure - Acquisitions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureAcquisitionsTables</Role>
      <ShortName>Acquisitions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureAcquisitions</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>99930803 - Disclosure - Intangible Assets, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureIntangibleAssetsNetTables</Role>
      <ShortName>Intangible Assets, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureIntangibleAssetsNet</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>99930903 - Disclosure - Long-Term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLongTermDebtTables</Role>
      <ShortName>Long-Term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureLongTermDebt</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>99931003 - Disclosure - Segment Reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureSegmentReportingTables</Role>
      <ShortName>Segment Reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureSegmentReporting</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>99931103 - Disclosure - Derivative Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureDerivativeFinancialInstrumentsTables</Role>
      <ShortName>Derivative Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureDerivativeFinancialInstruments</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>99931203 - Disclosure - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureFairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureFairValueOfFinancialInstruments</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>99931303 - Disclosure - Net Income Per Share Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureNetIncomePerShareInformationTables</Role>
      <ShortName>Net Income Per Share Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureNetIncomePerShareInformation</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>99931403 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureFairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureFairValueMeasurements</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>99931503 - Disclosure - Other Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureOtherComprehensiveIncomeLossTables</Role>
      <ShortName>Other Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureOtherComprehensiveIncomeLoss</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>99931603 - Disclosure - Shareholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureShareholdersEquityTables</Role>
      <ShortName>Shareholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureShareholdersEquity</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>99940401 - Disclosure - Revenue - Revenues by Service Line (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureRevenueRevenuesByServiceLineDetails</Role>
      <ShortName>Revenue - Revenues by Service Line (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>99940402 - Disclosure - Revenue - Contract Acquisition Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureRevenueContractAcquisitionCostsDetails</Role>
      <ShortName>Revenue - Contract Acquisition Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>99940501 - Disclosure - Accounts Receivable - Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureAccountsReceivableAllowanceForCreditLossesDetails</Role>
      <ShortName>Accounts Receivable - Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>99940601 - Disclosure - Landfill Accounting - Landfills Owned and Operated (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLandfillAccountingLandfillsOwnedAndOperatedDetails</Role>
      <ShortName>Landfill Accounting - Landfills Owned and Operated (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>99940602 - Disclosure - Landfill Accounting - Landfill Depletion (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLandfillAccountingLandfillDepletionDetails</Role>
      <ShortName>Landfill Accounting - Landfill Depletion (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>99940603 - Disclosure - Landfill Accounting - Reserve Assumptions and Accretion Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLandfillAccountingReserveAssumptionsAndAccretionExpenseDetails</Role>
      <ShortName>Landfill Accounting - Reserve Assumptions and Accretion Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>99940604 - Disclosure - Landfill Accounting - Final Capping, Closure and Post-Closure Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLandfillAccountingFinalCappingClosureAndPostClosureLiabilityDetails</Role>
      <ShortName>Landfill Accounting - Final Capping, Closure and Post-Closure Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>99940605 - Disclosure - Landfill Accounting - Liability Adjustments and Restricted Cash and Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLandfillAccountingLiabilityAdjustmentsAndRestrictedCashAndInvestmentsDetails</Role>
      <ShortName>Landfill Accounting - Liability Adjustments and Restricted Cash and Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>99940701 - Disclosure - Acquisitions - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureAcquisitionsNarrativeDetails</Role>
      <ShortName>Acquisitions - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>99940702 - Disclosure - Acquisitions - Consideration Transferred to Acquire Businesses and Assets Acquired, Liabilities Assumed Schedule (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureAcquisitionsConsiderationTransferredToAcquireBusinessesAndAssetsAcquiredLiabilitiesAssumedScheduleDetail</Role>
      <ShortName>Acquisitions - Consideration Transferred to Acquire Businesses and Assets Acquired, Liabilities Assumed Schedule (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>99940801 - Disclosure - Intangible Assets, Net - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureIntangibleAssetsNetNarrativeDetails</Role>
      <ShortName>Intangible Assets, Net - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>99940802 - Disclosure - Intangible Assets, Net - Intangible Assets Exclusive of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureIntangibleAssetsNetIntangibleAssetsExclusiveOfGoodwillDetails</Role>
      <ShortName>Intangible Assets, Net - Intangible Assets Exclusive of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>99940803 - Disclosure - Intangible Assets, Net - Estimated Future Amortization Expense, Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureIntangibleAssetsNetEstimatedFutureAmortizationExpenseIntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets, Net - Estimated Future Amortization Expense, Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>99940901 - Disclosure - Long-Term Debt - Schedule of LTD and Lease Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLongTermDebtScheduleOfLtdAndLeaseObligationsDetails</Role>
      <ShortName>Long-Term Debt - Schedule of LTD and Lease Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>99940902 - Disclosure - Long-Term Debt - Revolving Credit Agreement Schedule (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLongTermDebtRevolvingCreditAgreementScheduleDetails</Role>
      <ShortName>Long-Term Debt - Revolving Credit Agreement Schedule (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>99940903 - Disclosure - Long-Term Debt - Revolving Credit Agreement Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLongTermDebtRevolvingCreditAgreementNarrativeDetails</Role>
      <ShortName>Long-Term Debt - Revolving Credit Agreement Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>99940904 - Disclosure - Long-Term Debt - Senior Notes Narrative (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureLongTermDebtSeniorNotesNarrativeDetails</Role>
      <ShortName>Long-Term Debt - Senior Notes Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>99941001 - Disclosure - Segment Reporting - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureSegmentReportingNarrativeDetails</Role>
      <ShortName>Segment Reporting - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>99941002 - Disclosure - Segment Reporting - Summary of Financial Information of Reportable Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureSegmentReportingSummaryOfFinancialInformationOfReportableSegmentsDetails</Role>
      <ShortName>Segment Reporting - Summary of Financial Information of Reportable Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>99941003 - Disclosure - Segment Reporting - Changes in Goodwill by Reportable Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureSegmentReportingChangesInGoodwillByReportableSegmentDetails</Role>
      <ShortName>Segment Reporting - Changes in Goodwill by Reportable Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>99941101 - Disclosure - Derivative Financial Instruments - Interest Rate Swaps (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureDerivativeFinancialInstrumentsInterestRateSwapsDetails</Role>
      <ShortName>Derivative Financial Instruments - Interest Rate Swaps (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>99941102 - Disclosure - Derivative Financial Instruments - FV of Cash Flow Hedges (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureDerivativeFinancialInstrumentsFvOfCashFlowHedgesDetails</Role>
      <ShortName>Derivative Financial Instruments - FV of Cash Flow Hedges (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>99941103 - Disclosure - Derivative Financial Instruments - Cash Flow Hedges Impact on Financial Results (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureDerivativeFinancialInstrumentsCashFlowHedgesImpactOnFinancialResultsDetails</Role>
      <ShortName>Derivative Financial Instruments - Cash Flow Hedges Impact on Financial Results (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>99941201 - Disclosure - Fair Value of Financial Instruments - Carrying Values and Fair Values of Debt Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureFairValueOfFinancialInstrumentsCarryingValuesAndFairValuesOfDebtInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Carrying Values and Fair Values of Debt Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>99941301 - Disclosure - Net Income Per Share Information - Basic and Diluted Net Income Per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureNetIncomePerShareInformationBasicAndDilutedNetIncomePerCommonShareDetails</Role>
      <ShortName>Net Income Per Share Information - Basic and Diluted Net Income Per Common Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>99941401 - Disclosure - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureFairValueMeasurementsAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>99941402 - Disclosure - Fair Value Measurements - Change in FV for Level 3 Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureFairValueMeasurementsChangeInFvForLevel3LiabilitiesDetails</Role>
      <ShortName>Fair Value Measurements - Change in FV for Level 3 Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>99941501 - Disclosure - Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureOtherComprehensiveIncomeLossComponentsOfOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureOtherComprehensiveIncomeLossTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>99941502 - Disclosure - Other Comprehensive Income (Loss) - Amounts Included in AOCIL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureOtherComprehensiveIncomeLossAmountsIncludedInAocilDetails</Role>
      <ShortName>Other Comprehensive Income (Loss) - Amounts Included in AOCIL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureOtherComprehensiveIncomeLossTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>99941601 - Disclosure - 10-K - Shareholders' Equity - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/Disclosure10KShareholdersEquityNarrativeDetails</Role>
      <ShortName>10-K - Shareholders' Equity - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>99941602 - Disclosure - 10-K - Shareholders' Equity - Restricted Stock Units Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/Disclosure10KShareholdersEquityRestrictedStockUnitsActivityDetails</Role>
      <ShortName>10-K - Shareholders' Equity - Restricted Stock Units Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>99941602 - Disclosure - Shareholders' Equity - Restricted Share Units (RSUs) Activity Schedule (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureShareholdersEquityRestrictedShareUnitsRsusActivityScheduleDetails</Role>
      <ShortName>Shareholders' Equity - Restricted Share Units (RSUs) Activity Schedule (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>99941603 - Disclosure - 10-K - Shareholders' Equity - Summary of Activity Related to RSUs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/Disclosure10KShareholdersEquitySummaryOfActivityRelatedToRsusDetails</Role>
      <ShortName>10-K - Shareholders' Equity - Summary of Activity Related to RSUs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>99941603 - Disclosure - Shareholders' Equity - Summary of Warrant and Deferred Share Unit Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureShareholdersEquitySummaryOfWarrantAndDeferredShareUnitActivityDetails</Role>
      <ShortName>Shareholders' Equity - Summary of Warrant and Deferred Share Unit Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>99941604 - Disclosure - Shareholders' Equity - Summary of Vesting Activity Related to Restricted Share Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureShareholdersEquitySummaryOfVestingActivityRelatedToRestrictedShareUnitsDetails</Role>
      <ShortName>Shareholders' Equity - Summary of Vesting Activity Related to Restricted Share Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>99941607 - Disclosure - Shareholders' Equity - Vesting Activity Related RSUs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureShareholdersEquityVestingActivityRelatedRsusDetails</Role>
      <ShortName>Shareholders' Equity - Vesting Activity Related RSUs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>99941701 - Disclosure - Commitments and Contingencies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails</Role>
      <ShortName>Commitments and Contingencies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="wcn-20260331x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>99941801 - Disclosure - Subsequent Event (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://wasteconnections.com/role/DisclosureSubsequentEventDetails</Role>
      <ShortName>Subsequent Event (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://wasteconnections.com/role/DisclosureSubsequentEvent</ParentRole>
      <Position>77</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>wcn-20260331.xsd</File>
    <File>wcn-20260331_cal.xml</File>
    <File>wcn-20260331_def.xml</File>
    <File>wcn-20260331_lab.xml</File>
    <File>wcn-20260331_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="wcn-20260331x10q.htm">wcn-20260331x10q.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>wcn-20260331x10q001.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="2">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="994">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="31">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
