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  <import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="https://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/stpr/2018-01-31" schemaLocation="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd"/>
  <element name="AccountsPayableAndAccruedLiabilitiesMember" id="tri_AccountsPayableAndAccruedLiabilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AccumulatedAmortizationMember" id="tri_AccumulatedAmortizationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ActuarialGainsLossesNetDefinedBenefitLiabilityAsset" id="tri_ActuarialGainsLossesNetDefinedBenefitLiabilityAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdditionalBorrowingAmountFromLenders" id="tri_AdditionalBorrowingAmountFromLenders" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdjustedEBITDA" id="tri_AdjustedEBITDA" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdjustmentsForOtherMiscellaneous" id="tri_AdjustmentsForOtherMiscellaneous" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdjustmentsRelatedToEmployeeBenefitPlans" id="tri_AdjustmentsRelatedToEmployeeBenefitPlans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdministrationFeesDefinedBenefitLiabilityAsset" id="tri_AdministrationFeesDefinedBenefitLiabilityAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdministrationFeesDisbursementsDefinedBenefitLiabilityAsset" id="tri_AdministrationFeesDisbursementsDefinedBenefitLiabilityAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AfterIfrs15AdoptionMember" id="tri_AfterIfrs15AdoptionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AfterIFRS2AmendmentsMember" id="tri_AfterIFRS2AmendmentsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AgingOfTradeReceivablesAbstract" id="tri_AgingOfTradeReceivablesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AgingOfTradeReceivablesLineItems" id="tri_AgingOfTradeReceivablesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AgingOfTradeReceivablesTable" id="tri_AgingOfTradeReceivablesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="AgreementMaturityPeriod" id="tri_AgreementMaturityPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AllOtherCountriesMember" id="tri_AllOtherCountriesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AllowanceAccountForCreditLossesOfFinancialAssetsExceptForDoubtfulAccounts" id="tri_AllowanceAccountForCreditLossesOfFinancialAssetsExceptForDoubtfulAccounts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AllowanceAndSalesAdjustments" id="tri_AllowanceAndSalesAdjustments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AllowanceForSalesAdjustments" id="tri_AllowanceForSalesAdjustments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AnnualizedDividendMember" id="tri_AnnualizedDividendMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AreaOfOfficeSpace" id="tri_AreaOfOfficeSpace" type="num:areaItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssetCeilingBalance" id="tri_AssetCeilingBalance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssetsLiabilitiesAtAmortizedCostMember" id="tri_AssetsLiabilitiesAtAmortizedCostMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssetsLiabilitiesAtFairValueThroughEarningsMember" id="tri_AssetsLiabilitiesAtFairValueThroughEarningsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssetsRecognisedAsOfAcquisitionDate" id="tri_AssetsRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AssumptionOfPerpetualGrowthRates" id="tri_AssumptionOfPerpetualGrowthRates" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BalanceSheetLocationAxis" id="tri_BalanceSheetLocationAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="BalanceSheetLocationMember" id="tri_BalanceSheetLocationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BankAndOtherMember" id="tri_BankAndOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BankIndebtednessMember" id="tri_BankIndebtednessMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BetweenOneAndTwoYearsMember" id="tri_BetweenOneAndTwoYearsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BetweenTwoAndThreeYearsMember" id="tri_BetweenTwoAndThreeYearsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowedAndRepaidAmount" id="tri_BorrowedAndRepaidAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowingRedemptionAxis" id="tri_BorrowingRedemptionAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="BorrowingRedemptionDomain" id="tri_BorrowingRedemptionDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowingsMaximumBorrowingCapacity" id="tri_BorrowingsMaximumBorrowingCapacity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowingsRepaidDate" id="tri_BorrowingsRepaidDate" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BorrowingsRepayment" id="tri_BorrowingsRepayment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BritishPoundSterlingBuyMember" id="tri_BritishPoundSterlingBuyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquiredPurchasePrice" id="tri_BusinessAcquiredPurchasePrice" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionPurchasePriceAllocationAndAssetsAcquiredLiabilitiesAssumedNet" id="tri_BusinessAcquisitionPurchasePriceAllocationAndAssetsAcquiredLiabilitiesAssumedNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CanadianDollarMember" id="tri_CanadianDollarMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Capital1" id="tri_Capital1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalContribution" id="tri_CapitalContribution" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLossesMember" id="tri_CapitalLossesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashAndCashEquivalentMember" id="tri_CashAndCashEquivalentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashFlowHedgeSensitivityToIncreaseInCadInterestRates" id="tri_CashFlowHedgeSensitivityToIncreaseInCadInterestRates" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashFlowHedgeSensitivityToIncreaseInUSDInterestRates" id="tri_CashFlowHedgeSensitivityToIncreaseInUSDInterestRates" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashPaidForAcquisitionOfBusinesses" id="tri_CashPaidForAcquisitionOfBusinesses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashPricePerOrdinaryShare" id="tri_CashPricePerOrdinaryShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashTradeAndOtherReceivablesMember" id="tri_CashTradeAndOtherReceivablesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommercialPaper1Member" id="tri_CommercialPaper1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommercialPaperCreditFacilitiesMember" id="tri_CommercialPaperCreditFacilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommitmentAndContingenciesAbstract" id="tri_CommitmentAndContingenciesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommonShareholdersAbstract" id="tri_CommonShareholdersAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ComputerSoftwareComputerHardwareAndOtherPropertyMember" id="tri_ComputerSoftwareComputerHardwareAndOtherPropertyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Contingencies" id="tri_Contingencies" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContingentConsideration" id="tri_ContingentConsideration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContingentConsiderationOne" id="tri_ContingentConsiderationOne" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContinuingOperations1Member" id="tri_ContinuingOperations1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CorporateAssetsMember" id="tri_CorporateAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CorporateBondsMember" id="tri_CorporateBondsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CorporateCostsMember" id="tri_CorporateCostsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CorporatesMember" id="tri_CorporatesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditFacilityOneMember" id="tri_CreditFacilityOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditFacilityTwoMember" id="tri_CreditFacilityTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditRatingsOnCommercialPaperDescription" id="tri_CreditRatingsOnCommercialPaperDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditRatingsOnLongtermDebtDescription" id="tri_CreditRatingsOnLongtermDebtDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditRatingsTrendDescription" id="tri_CreditRatingsTrendDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CrosscurrencyInterestRateSwapsMember" id="tri_CrosscurrencyInterestRateSwapsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CurrencyAndInterestRatePaid" id="tri_CurrencyAndInterestRatePaid" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CurrencyAndInterestRateReceived" id="tri_CurrencyAndInterestRateReceived" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DataExpenses" id="tri_DataExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DBRSLimitedMember" id="tri_DBRSLimitedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtAfterCurrencyHedgingArrangements" id="tri_DebtAfterCurrencyHedgingArrangements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtAfterSwaps" id="tri_DebtAfterSwaps" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtBeforeCurrencyHedgingArrangements" id="tri_DebtBeforeCurrencyHedgingArrangements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtIssuanceCost" id="tri_DebtIssuanceCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtRelatedHedgesInflows" id="tri_DebtRelatedHedgesInflows" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtRelatedHedgesOutflows" id="tri_DebtRelatedHedgesOutflows" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DecreaseOfProfitLossFromContinuingOperations" id="tri_DecreaseOfProfitLossFromContinuingOperations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DecreaseProfitLossBeforeTax" id="tri_DecreaseProfitLossBeforeTax" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeductibleTemporaryDifferencesInvestmentsInSubsidiariesAndOthersMember" id="tri_DeductibleTemporaryDifferencesInvestmentsInSubsidiariesAndOthersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredAndShareBasedCompensationMember" id="tri_DeferredAndShareBasedCompensationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredCommissions1" id="tri_DeferredCommissions1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredIncomeTaxExpenseAxis" id="tri_DeferredIncomeTaxExpenseAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="DeferredIncomeTaxExpenseDomain" id="tri_DeferredIncomeTaxExpenseDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsAbstract" id="tri_DeferredTaxAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsAndLiabilitiesLineItems" id="tri_DeferredTaxAssetsAndLiabilitiesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsAndLiabilitiesTable" id="tri_DeferredTaxAssetsAndLiabilitiesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="DeferredTaxAssetsCarryForwardLosses" id="tri_DeferredTaxAssetsCarryForwardLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsGross1" id="tri_DeferredTaxAssetsGross1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsMember" id="tri_DeferredTaxAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsToBeRecoveredAfterMoreThan12Months" id="tri_DeferredTaxAssetsToBeRecoveredAfterMoreThan12Months" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsToBeRecoveredWithin12Months" id="tri_DeferredTaxAssetsToBeRecoveredWithin12Months" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxLiabilities1Abstract" id="tri_DeferredTaxLiabilities1Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxLiabilitiesMember" id="tri_DeferredTaxLiabilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxLiabilitiesToBeRecoveredAfterMoreThan12Months" id="tri_DeferredTaxLiabilitiesToBeRecoveredAfterMoreThan12Months" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxLiabilitiesToBeRecoveredWithin12Months" id="tri_DeferredTaxLiabilitiesToBeRecoveredWithin12Months" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxLiabilityGross" id="tri_DeferredTaxLiabilityGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxLiabilityOnSaleOfAssets" id="tri_DeferredTaxLiabilityOnSaleOfAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedBenefitPlanMember" id="tri_DefinedBenefitPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedBenefitPlansAdditionalInformationAxis" id="tri_DefinedBenefitPlansAdditionalInformationAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="DefinedBenefitPlansAdditionalInformationDomain" id="tri_DefinedBenefitPlansAdditionalInformationDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerecognitionOfDeferredTaxAssets" id="tri_DerecognitionOfDeferredTaxAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerivativeFinancialAssetsMember" id="tri_DerivativeFinancialAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerivativeFinancialAssetsNet" id="tri_DerivativeFinancialAssetsNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerivativeFinancialLiabilitiesMember" id="tri_DerivativeFinancialLiabilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerivativeInstrumentsLiabilitiesMember" id="tri_DerivativeInstrumentsLiabilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerivativesDesignatedAsFairValueHedges" id="tri_DerivativesDesignatedAsFairValueHedges" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureOfWeightedAverageNumberOfCommonSharesOutstandingAndItsReconciliationExplanatory" id="tri_DisclosureOfWeightedAverageNumberOfCommonSharesOutstandingAndItsReconciliationExplanatory" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureRecentAccountingPronouncementsExplanatory" id="tri_DisclosureRecentAccountingPronouncementsExplanatory" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureShareBasedCompensationNumberOfAwardsOutstandingAbstract" id="tri_DisclosureShareBasedCompensationNumberOfAwardsOutstandingAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureShareBasedCompensationSummaryOfAdditionalInformationRelatingToStockOptionsAndSARsAbstract" id="tri_DisclosureShareBasedCompensationSummaryOfAdditionalInformationRelatingToStockOptionsAndSARsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DiscontinuedOperationsOtherNonoperatingIncomeExpensesNet" id="tri_DiscontinuedOperationsOtherNonoperatingIncomeExpensesNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendAnnouncementMember" id="tri_DividendAnnouncementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendAxis" id="tri_DividendAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="DividendDomain" id="tri_DividendDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendPayableRatePercentage" id="tri_DividendPayableRatePercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendsDeclaredOrdinarySharesPerShare" id="tri_DividendsDeclaredOrdinarySharesPerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DividendsReinvestedOrdinaryShares" id="tri_DividendsReinvestedOrdinaryShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DocumentAndEntityInformationAbstract" id="tri_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EarlyRedemptionOfDebtSecuritiesMember" id="tri_EarlyRedemptionOfDebtSecuritiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EffectiveIncomeTaxNetChargeAssociatedWithSeparationOfFinancialAndRisk" id="tri_EffectiveIncomeTaxNetChargeAssociatedWithSeparationOfFinancialAndRisk" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ElectronicSoftwareAndServicesMember" id="tri_ElectronicSoftwareAndServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmbeddedDerivativeAssetPosition" id="tri_EmbeddedDerivativeAssetPosition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmbeddedDerivativeLiabilityPosition" id="tri_EmbeddedDerivativeLiabilityPosition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmbeddedDerivativesMember" id="tri_EmbeddedDerivativesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmeaMember" id="tri_EmeaMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmployeeBenefitExpenseMember" id="tri_EmployeeBenefitExpenseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmployeeBenefitsMember" id="tri_EmployeeBenefitsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmployeeLongtermIncentives" id="tri_EmployeeLongtermIncentives" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmployeeRelatedMember" id="tri_EmployeeRelatedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmployeeStockPurchasePlanMember" id="tri_EmployeeStockPurchasePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentsMember" id="tri_EquityMethodInvestmentsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodOfInvestmentWarrants" id="tri_EquityMethodOfInvestmentWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquitysettledPlansMember" id="tri_EquitysettledPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EurosSellMember" id="tri_EurosSellMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpectedCreditLossesOnOtherReceivables" id="tri_ExpectedCreditLossesOnOtherReceivables" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpectedIncreaseOfDepreciationAndInterestExpense" id="tri_ExpectedIncreaseOfDepreciationAndInterestExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpenseFromServicesProvidedByRelatedParty" id="tri_ExpenseFromServicesProvidedByRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpenseFromShareBasedPaymentTransactionsWithEmployeesShareBasedCompensationIncludingExpenseRelatingToRevaluationOfWithholdingTaxes" id="tri_ExpenseFromShareBasedPaymentTransactionsWithEmployeesShareBasedCompensationIncludingExpenseRelatingToRevaluationOfWithholdingTaxes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpensesDiscontinuedOperations1" id="tri_ExpensesDiscontinuedOperations1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FacilitiesRelatedMember" id="tri_FacilitiesRelatedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAdjustments" id="tri_FairValueAdjustments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueInterestComponentOfCrossCurrencyInterestRateSwaps" id="tri_FairValueInterestComponentOfCrossCurrencyInterestRateSwaps" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueOfCGUsInExcessOfCarryingValue" id="tri_FairValueOfCGUsInExcessOfCarryingValue" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueOfEquity" id="tri_FairValueOfEquity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinanceIncomeCostAbstract" id="tri_FinanceIncomeCostAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancialAndRiskMember" id="tri_FinancialAndRiskMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancialAssetsLiabilitiesNet" id="tri_FinancialAssetsLiabilitiesNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancialInstrumentsAtFairValueThroughProfitOrLoss" id="tri_FinancialInstrumentsAtFairValueThroughProfitOrLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancialInstrumentsDesignatedAsHedgingInstrumentsMaturity" id="tri_FinancialInstrumentsDesignatedAsHedgingInstrumentsMaturity" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FitchMember" id="tri_FitchMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FivePointEightFiveDebenturesDueTwoThousandFortyMember" id="tri_FivePointEightFiveDebenturesDueTwoThousandFortyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FivePointFiveZeroDebenturesDueTwoThousandThirtyFiveMember" id="tri_FivePointFiveZeroDebenturesDueTwoThousandThirtyFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FivePointSixFiveNotesDueTwoThousandFortyThreeMember" id="tri_FivePointSixFiveNotesDueTwoThousandFortyThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FixedRateOfInstrumentsAbstract" id="tri_FixedRateOfInstrumentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignExchangeContractsMember" id="tri_ForeignExchangeContractsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardExchangeContractsAssetPosition" id="tri_ForwardExchangeContractsAssetPosition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardExchangeContractsLiabilityPosition" id="tri_ForwardExchangeContractsLiabilityPosition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardInterestRateSwapsCashFlowHedgesMember" id="tri_ForwardInterestRateSwapsCashFlowHedgesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FourPointFiveZeroNotesDueTwoThousandFortyThreeMember" id="tri_FourPointFiveZeroNotesDueTwoThousandFortyThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FourPointSevenZeroNotesDueTwoThousandNineteenMember" id="tri_FourPointSevenZeroNotesDueTwoThousandNineteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FourPointThreeFiveNotesDueTwoThousandTwentyMember" id="tri_FourPointThreeFiveNotesDueTwoThousandTwentyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FourPointThreeZeroNotesDueTwoThousandTwentyThreeMember" id="tri_FourPointThreeZeroNotesDueTwoThousandTwentyThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FullRedemptionMember" id="tri_FullRedemptionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FundedPlansMember" id="tri_FundedPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FuturePaymentCommitmentsUnderPurchaseObligationsAbstract" id="tri_FuturePaymentCommitmentsUnderPurchaseObligationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FutureUnconditionalPurchaseCommitment" id="tri_FutureUnconditionalPurchaseCommitment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FutureUnconditionalPurchaseObligations" id="tri_FutureUnconditionalPurchaseObligations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainOnSaleOfSubsidiary" id="tri_GainOnSaleOfSubsidiary" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainsLossesOnChangeInFairValueOfDerivativesLineItems" id="tri_GainsLossesOnChangeInFairValueOfDerivativesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainsLossesOnChangeInFairValueOfDerivativesTable" id="tri_GainsLossesOnChangeInFairValueOfDerivativesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="GainsLossesRecognizedInProfitLossAriseFromForeignCurrencyTranslationRelatedToDebt" id="tri_GainsLossesRecognizedInProfitLossAriseFromForeignCurrencyTranslationRelatedToDebt" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GlobalPrintMember" id="tri_GlobalPrintMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodsAndServicesExpenses" id="tri_GoodsAndServicesExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillAndOtherIdentifiableIntangibleAssetsMember" id="tri_GoodwillAndOtherIdentifiableIntangibleAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GovernmentBondsMember" id="tri_GovernmentBondsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="HedgedInterestExpenseMember" id="tri_HedgedInterestExpenseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IFRS16Member" id="tri_IFRS16Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ImpactOnEarningsDueToChangesInForeignCurrencyExchangeRatesDueToChangesInForeignCurrencyExchangeRates" id="tri_ImpactOnEarningsDueToChangesInForeignCurrencyExchangeRatesDueToChangesInForeignCurrencyExchangeRates" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ImpactOnEarningsFromFinancialAssetsAndLiabilitiesDueToChangesInForeignCurrencyExchangeRates" id="tri_ImpactOnEarningsFromFinancialAssetsAndLiabilitiesDueToChangesInForeignCurrencyExchangeRates" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ImpactOnEarningsFromNonpermanentIntercompanyLoansDueToChangesInForeignCurrencyExchangeRates" id="tri_ImpactOnEarningsFromNonpermanentIntercompanyLoansDueToChangesInForeignCurrencyExchangeRates" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeFromServicesProvidedToRelatedParty" id="tri_IncomeFromServicesProvidedToRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeLossFromContinuingAndDiscontinuedOperationsLineItems" id="tri_IncomeLossFromContinuingAndDiscontinuedOperationsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeLossFromDiscontinuedOperationsAbstract" id="tri_IncomeLossFromDiscontinuedOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeLossFromDiscontinuedOperationsTable" id="tri_IncomeLossFromDiscontinuedOperationsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="IncreasedDividendsPaidOrdinarySharesPerShare" id="tri_IncreasedDividendsPaidOrdinarySharesPerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInAssetCeiling" id="tri_IncreaseDecreaseInAssetCeiling" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInDividendProposedOrDeclaredPerShare" id="tri_IncreaseDecreaseInDividendProposedOrDeclaredPerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInEffectiveTaxRate" id="tri_IncreaseDecreaseInEffectiveTaxRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInWorkingCapitalAndOtherItems" id="tri_IncreaseDecreaseInWorkingCapitalAndOtherItems" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseThroughDisposalOfBusinessesAllowanceAccountForCreditLossesOfFinancialAssets" id="tri_IncreaseDecreaseThroughDisposalOfBusinessesAllowanceAccountForCreditLossesOfFinancialAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseThroughTreasuryShareTransactionsEquityCombinedWithShareRepurchaseAgreementAmount" id="tri_IncreaseDecreaseThroughTreasuryShareTransactionsEquityCombinedWithShareRepurchaseAgreementAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseThroughTreasuryShareTransactionsShares" id="tri_IncreaseDecreaseThroughTreasuryShareTransactionsShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseInLifeExpectancy" id="tri_IncreaseInLifeExpectancy" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseInReserveForAccountsReceivablePercentage" id="tri_IncreaseInReserveForAccountsReceivablePercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InsuranceAmountContributedToFairValueOfPlanAssets" id="tri_InsuranceAmountContributedToFairValueOfPlanAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestCostOnIrrecoverableSurplusNetDefinedBenefitAssetToAssetCeilingNetDefinedBenefitLiabilityAsset" id="tri_InterestCostOnIrrecoverableSurplusNetDefinedBenefitAssetToAssetCeilingNetDefinedBenefitLiabilityAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestExpenseOnDerivativeFinancialInstruments" id="tri_InterestExpenseOnDerivativeFinancialInstruments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestIncomeSensitivity" id="tri_InterestIncomeSensitivity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateChange" id="tri_InterestRateChange" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentsInBusinessesRecognisedAsOfAcquisitionDate" id="tri_InvestmentsInBusinessesRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="JapaneseYenSellMember" id="tri_JapaneseYenSellMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LaterThanThreeYearMember" id="tri_LaterThanThreeYearMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LaterThanThreeYearTo2048Member" id="tri_LaterThanThreeYearTo2048Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LeasesExpirationPeriod" id="tri_LeasesExpirationPeriod" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LegalAndTaxAndAccountingMember" id="tri_LegalAndTaxAndAccountingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LegalMember" id="tri_LegalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LegalProfessionalsMember" id="tri_LegalProfessionalsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LessThanOneMonthPastDueMember" id="tri_LessThanOneMonthPastDueMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LiabilitiesRecognisedAsOfAcquisitionDate" id="tri_LiabilitiesRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LifeExpectationPeriodOfFemaleEmployeesAgeAtFortyAndRetiringAtAgeSixtyFive" id="tri_LifeExpectationPeriodOfFemaleEmployeesAgeAtFortyAndRetiringAtAgeSixtyFive" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LifeExpectationPeriodOfFemaleEmployeesRetiringAtAgeSixtyFive" id="tri_LifeExpectationPeriodOfFemaleEmployeesRetiringAtAgeSixtyFive" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LifeExpectationPeriodOfMaleEmployeesAgeAtFortyAndRetiringAtAgeSixtyFive" id="tri_LifeExpectationPeriodOfMaleEmployeesAgeAtFortyAndRetiringAtAgeSixtyFive" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LifeExpectationPeriodOfMaleEmployeesRetiringAtAgeSixtyFive" id="tri_LifeExpectationPeriodOfMaleEmployeesRetiringAtAgeSixtyFive" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LondonInterbankOfferedRateLIBOR1Member" id="tri_LondonInterbankOfferedRateLIBOR1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Long1Member" id="tri_Long1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LossesFromRedemptionOfDebtSecurities" id="tri_LossesFromRedemptionOfDebtSecurities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaterialDefinedBenefitPlansMember" id="tri_MaterialDefinedBenefitPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumExposureToPriceRisk" id="tri_MaximumExposureToPriceRisk" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumGrossLoanCommitmentUponRequest" id="tri_MaximumGrossLoanCommitmentUponRequest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumNumberOfCommonSharesAvailableForGrant" id="tri_MaximumNumberOfCommonSharesAvailableForGrant" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumPayrollDeductionAllowedForEmployeeStockPurchasePlan" id="tri_MaximumPayrollDeductionAllowedForEmployeeStockPurchasePlan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumSharesAllowedToBePurchasedForEmployeeStockPurchasePlan" id="tri_MaximumSharesAllowedToBePurchasedForEmployeeStockPurchasePlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MoodysMember" id="tri_MoodysMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MultiAssetMember" id="tri_MultiAssetMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetActuarialGainsAndLosses" id="tri_NetActuarialGainsAndLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetDebtRatio" id="tri_NetDebtRatio" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetInterestExpenseFromDebtAndOther" id="tri_NetInterestExpenseFromDebtAndOther" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetInterestExpenseFromPensionAndOtherPostEmploymentBenefitPlans" id="tri_NetInterestExpenseFromPensionAndOtherPostEmploymentBenefitPlans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NewsAndEditorialMember" id="tri_NewsAndEditorialMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonControllingInterestsAbstract" id="tri_NonControllingInterestsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NormalCourseIssuerBidMember" id="tri_NormalCourseIssuerBidMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NormalRetirementAge" id="tri_NormalRetirementAge" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NotesAndDebenturesMember" id="tri_NotesAndDebenturesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NotesDebenturesAndCommercialPaperMember" id="tri_NotesDebenturesAndCommercialPaperMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfAntidilutiveShareOptionsOutstanding" id="tri_NumberOfAntidilutiveShareOptionsOutstanding" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfCommonSharesAvailableForGrant" id="tri_NumberOfCommonSharesAvailableForGrant" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfCommonSharesPurchased" id="tri_NumberOfCommonSharesPurchased" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfSharesIssuedThroughStockCompensationPlans" id="tri_NumberOfSharesIssuedThroughStockCompensationPlans" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfSharesIssuedUnderDividendReinvestmentPlan" id="tri_NumberOfSharesIssuedUnderDividendReinvestmentPlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfSharesTendered" id="tri_NumberOfSharesTendered" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfTransactions" id="tri_NumberOfTransactions" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfTransactionsBusinessesAcquired" id="tri_NumberOfTransactionsBusinessesAcquired" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfTransactionsInvestmentsInBusinesses" id="tri_NumberOfTransactionsInvestmentsInBusinesses" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OnePointSixFiveNotesDueTwoThousandSeventeenMember" id="tri_OnePointSixFiveNotesDueTwoThousandSeventeenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OnePointThreeZeroNotesDueTwoThousandSeventeenMember" id="tri_OnePointThreeZeroNotesDueTwoThousandSeventeenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OPEBMember" id="tri_OPEBMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingExpenseExcludingDepreciationAmortizationAndOther" id="tri_OperatingExpenseExcludingDepreciationAmortizationAndOther" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingExpenses1Abstract" id="tri_OperatingExpenses1Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherAdjustmentsRelatedToPriorYears" id="tri_OtherAdjustmentsRelatedToPriorYears" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherAssociatesAndJointVenturesMember" id="tri_OtherAssociatesAndJointVenturesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherAttributesAndCreditsMember" id="tri_OtherAttributesAndCreditsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherComprehensiveIncomeBeforeTaxActuarialLossesGainsOnDefinedBenefitPlans" id="tri_OtherComprehensiveIncomeBeforeTaxActuarialLossesGainsOnDefinedBenefitPlans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherCountriesMember" id="tri_OtherCountriesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherCurrenciesMember" id="tri_OtherCurrenciesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherEquityMethodInvestmentsMember" id="tri_OtherEquityMethodInvestmentsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherFinancialLiabilities1Member" id="tri_OtherFinancialLiabilities1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherFixedIncomeMember" id="tri_OtherFixedIncomeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherJurisdictionsMember" id="tri_OtherJurisdictionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherMember" id="tri_OtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherNoncurrentAssetsAbstract" id="tri_OtherNoncurrentAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherNoncurrentAssetsMember" id="tri_OtherNoncurrentAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherOperatingGainsNetMember" id="tri_OtherOperatingGainsNetMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherOperatingIncomeAbstract" id="tri_OtherOperatingIncomeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherOperatingIncomeExpenseAxis" id="tri_OtherOperatingIncomeExpenseAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="OtherOperatingIncomeExpenseDomain" id="tri_OtherOperatingIncomeExpenseDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherPostEmploymentBenefitsMember" id="tri_OtherPostEmploymentBenefitsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OthersMember" id="tri_OthersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PartialRedemptionMember" id="tri_PartialRedemptionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PastServiceCost" id="tri_PastServiceCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsToAcquireAnnuityContractsFromThirdParty" id="tri_PaymentsToAcquireAnnuityContractsFromThirdParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PensionContribution" id="tri_PensionContribution" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PensionContributionAnnouncementMember" id="tri_PensionContributionAnnouncementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageChangeInRevenuesDueToChangeInForeignExchangeRates" id="tri_PercentageChangeInRevenuesDueToChangeInForeignExchangeRates" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfAllowanceAccountForCreditLossesOfFinancialAssets" id="tri_PercentageOfAllowanceAccountForCreditLossesOfFinancialAssets" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCashAndCashEquivalentsAtAMinusOrAboveRatedInstitutions" id="tri_PercentageOfCashAndCashEquivalentsAtAMinusOrAboveRatedInstitutions" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfDefinedBenefitObligationAttributableToActiveEmployees" id="tri_PercentageOfDefinedBenefitObligationAttributableToActiveEmployees" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfDefinedBenefitObligationAttributableToFormerEmployeesNotRetired" id="tri_PercentageOfDefinedBenefitObligationAttributableToFormerEmployeesNotRetired" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfDefinedBenefitObligationAttributableToParticipantsByGeography" id="tri_PercentageOfDefinedBenefitObligationAttributableToParticipantsByGeography" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfDefinedBenefitObligationAttributableToRetiredEmployees" id="tri_PercentageOfDefinedBenefitObligationAttributableToRetiredEmployees" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfDiscountAllowedForEmployeeStockPurchasePlan" id="tri_PercentageOfDiscountAllowedForEmployeeStockPurchasePlan" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfFinancialAndRiskBusiness" id="tri_PercentageOfFinancialAndRiskBusiness" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfOtherEquityInstrumentVested" id="tri_PercentageOfOtherEquityInstrumentVested" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfOwnershipHeldByRelatedParty" id="tri_PercentageOfOwnershipHeldByRelatedParty" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfOwnershipInterest" id="tri_PercentageOfOwnershipInterest" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfOwnershipSold" id="tri_PercentageOfOwnershipSold" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfParticipantsInDefinedBenefitsPlans" id="tri_PercentageOfParticipantsInDefinedBenefitsPlans" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfParticipantsInDefinedBenefitsPlansMember" id="tri_PercentageOfParticipantsInDefinedBenefitsPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfShareRecognisedInProfitOrLoss" id="tri_PercentageOfShareRecognisedInProfitOrLoss" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfValuationTechniques" id="tri_PercentageOfValuationTechniques" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfVotingEquityInterestsRetained" id="tri_PercentageOfVotingEquityInterestsRetained" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PerformanceRestrictedShareUnitMember" id="tri_PerformanceRestrictedShareUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PlanAmendmentsDefinedBenefitLiabilityAsset" id="tri_PlanAmendmentsDefinedBenefitLiabilityAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PlanExpenseBenefitRecognizedInIncomeStatementAbstract" id="tri_PlanExpenseBenefitRecognizedInIncomeStatementAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PledgedAssets" id="tri_PledgedAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Position1Axis" id="tri_Position1Axis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="Position1Domain" id="tri_Position1Domain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PostEmploymentBenefitExpense" id="tri_PostEmploymentBenefitExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PostemploymentBenefitExpenseDefinedBenefitMaterialPlans" id="tri_PostemploymentBenefitExpenseDefinedBenefitMaterialPlans" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PotentialRepurchaseOfCommonShares" id="tri_PotentialRepurchaseOfCommonShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PredefinedShareRepurchasePlan" id="tri_PredefinedShareRepurchasePlan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PredefinedShareRepurchasePlanLiability" id="tri_PredefinedShareRepurchasePlanLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreferenceSharesDividendsIncomeStatementImpact" id="tri_PreferenceSharesDividendsIncomeStatementImpact" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreferredSharesAndOtherExcludedAdditionalPaidInCapital" id="tri_PreferredSharesAndOtherExcludedAdditionalPaidInCapital" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrepaidExpensesAndOtherCurrentAssetsAbstract" id="tri_PrepaidExpensesAndOtherCurrentAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrepaidExpensesAndOtherCurrentAssetsMember" id="tri_PrepaidExpensesAndOtherCurrentAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrepaidExpensesAndOtherCurrentAssetsRecognisedAsOfAcquisitionDate" id="tri_PrepaidExpensesAndOtherCurrentAssetsRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrimaryDebtInstrumentsMember" id="tri_PrimaryDebtInstrumentsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrivateShareRepurchaseAgreementMember" id="tri_PrivateShareRepurchaseAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProfitLossAfterTaxDiscontinuedOperations" id="tri_ProfitLossAfterTaxDiscontinuedOperations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProfitLossFromContinuingOperationsBeforeIncomeTaxExpenseOrIncomeAndBeforeTheCompanyShareOfPosttaxEarningsOrLossesFromEquitymethodInvestments" id="tri_ProfitLossFromContinuingOperationsBeforeIncomeTaxExpenseOrIncomeAndBeforeTheCompanyShareOfPosttaxEarningsOrLossesFromEquitymethodInvestments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PropertiesLeasedMember" id="tri_PropertiesLeasedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProvisionForUncertainTaxPositions" id="tri_ProvisionForUncertainTaxPositions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PurchaseOfAnnuityInsuranceContractLiability" id="tri_PurchaseOfAnnuityInsuranceContractLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QuarterlyDividendMember" id="tri_QuarterlyDividendMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QuotedPlanAssetsMember" id="tri_QuotedPlanAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeFourMember" id="tri_RangeFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeOneMember" id="tri_RangeOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeThreeMember" id="tri_RangeThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeTwoMember" id="tri_RangeTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RealEstateExpense" id="tri_RealEstateExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReceiptsForNewsAndContent" id="tri_ReceiptsForNewsAndContent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReclassificationAdjustmentsOnCashFlowHedgesNetOfTaxForeignExchange" id="tri_ReclassificationAdjustmentsOnCashFlowHedgesNetOfTaxForeignExchange" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RecognitionOfPriorTaxLosses" id="tri_RecognitionOfPriorTaxLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RecognitionOfPriorYearDeferredTaxAssets" id="tri_RecognitionOfPriorYearDeferredTaxAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RecurringMember" id="tri_RecurringMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RecurringRevenuesSubscriptionTerm" id="tri_RecurringRevenuesSubscriptionTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RedemptionOfNotesMember" id="tri_RedemptionOfNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReductionOfFairValueAdjustmentsForHedges" id="tri_ReductionOfFairValueAdjustmentsForHedges" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RefinitivMember" id="tri_RefinitivMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReinvestmentFund" id="tri_ReinvestmentFund" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RemeasurementLossOnInvestment" id="tri_RemeasurementLossOnInvestment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepositionCost" id="tri_RepositionCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchasesOfCommonSharesMember" id="tri_RepurchasesOfCommonSharesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReserveOfGainsAndLossesOnFinancialInstrumentsMember" id="tri_ReserveOfGainsAndLossesOnFinancialInstrumentsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestOfWorldMember" id="tri_RestOfWorldMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestructuringMember" id="tri_RestructuringMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReturnOfCapitalMember" id="tri_ReturnOfCapitalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReturnOfCapitalOnCommonShares" id="tri_ReturnOfCapitalOnCommonShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReturnOfCapitalOnCommonSharesMember" id="tri_ReturnOfCapitalOnCommonSharesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReturnOnCapitalMember" id="tri_ReturnOnCapitalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReutersMember" id="tri_ReutersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReutersNewsMember" id="tri_ReutersNewsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReutersPensionFundMember" id="tri_ReutersPensionFundMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevenueOfRemainingPerformanceObligations" id="tri_RevenueOfRemainingPerformanceObligations" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReverseStockSplit" id="tri_ReverseStockSplit" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevolvingCreditFacility1Member" id="tri_RevolvingCreditFacility1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SalariesCommissionAndAllowances" id="tri_SalariesCommissionAndAllowances" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SalariesCommissionsAndAllowancesIncludeSeveranceCosts" id="tri_SalariesCommissionsAndAllowancesIncludeSeveranceCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfChangesInDefinedBenefitObligationExplanatory" id="tri_ScheduleOfChangesInDefinedBenefitObligationExplanatory" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesIICumulativeRedeemablePreferenceShareCapitalMember" id="tri_SeriesIICumulativeRedeemablePreferenceShareCapitalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareAppreciationRightsMember" id="tri_ShareAppreciationRightsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharePricePaid" id="tri_SharePricePaid" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareRedemptionPrice" id="tri_ShareRedemptionPrice" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareRepurchaseProgramMember" id="tri_ShareRepurchaseProgramMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareRepurchasesMember" id="tri_ShareRepurchasesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharesIssuedOrPurchasedByTypeAxis" id="tri_SharesIssuedOrPurchasedByTypeAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="SharesIssuedOrPurchasedByTypeDomain" id="tri_SharesIssuedOrPurchasedByTypeDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharesIssuedUnderDividendReinvestmentPlan" id="tri_SharesIssuedUnderDividendReinvestmentPlan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharesRepurchasedAveragePricePerShare" id="tri_SharesRepurchasedAveragePricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Short1Member" id="tri_Short1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SixPointFiveZeroNotesDueTwoThousandEighteenMember" id="tri_SixPointFiveZeroNotesDueTwoThousandEighteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StandardAndPoorMember" id="tri_StandardAndPoorMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StatedCapitalMember" id="tri_StatedCapitalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StatementLineItems" id="tri_StatementLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StatementTable" id="tri_StatementTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="StateNetOperatingLossesMember" id="tri_StateNetOperatingLossesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIncentivePlanMember" id="tri_StockIncentivePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOption1Member" id="tri_StockOption1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SubstantialIssuerBidOfferMember" id="tri_SubstantialIssuerBidOfferMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SubstantialIssuerBidTenderOfferMember" id="tri_SubstantialIssuerBidTenderOfferMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SummaryOfHypotheticalChangeInForeignCurrencyExchangeRatesOnEarningsAbstract" id="tri_SummaryOfHypotheticalChangeInForeignCurrencyExchangeRatesOnEarningsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SummaryOfHypotheticalChangeInForeignCurrencyExchangeRatesOnEarningsLineItems" id="tri_SummaryOfHypotheticalChangeInForeignCurrencyExchangeRatesOnEarningsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SummaryOfWeightedAverageActuarialAssumptionsExplanatory" id="tri_SummaryOfWeightedAverageActuarialAssumptionsExplanatory" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SupplementalCashFlowInformation1Abstract" id="tri_SupplementalCashFlowInformation1Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SupplementaryPensionSchemeMember" id="tri_SupplementaryPensionSchemeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxAndAccountingMember" id="tri_TaxAndAccountingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxationInformationAxis" id="tri_TaxationInformationAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="TaxationInformationMember" id="tri_TaxationInformationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxEffectOfNetNondeductibleNontaxableForeignExchangeAndOtherLossesGains" id="tri_TaxEffectOfNetNondeductibleNontaxableForeignExchangeAndOtherLossesGains" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxEffectOfWithholdingTaxes" id="tri_TaxEffectOfWithholdingTaxes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxLossesCarryforward" id="tri_TaxLossesCarryforward" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxLossesForWhichNoBenefitIsRecognized" id="tri_TaxLossesForWhichNoBenefitIsRecognized" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxLossesMember" id="tri_TaxLossesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxOnRestructuringActivitiesAssociatedWithTheFinancialAndRiskTransaction" id="tri_TaxOnRestructuringActivitiesAssociatedWithTheFinancialAndRiskTransaction" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxProfessionalsMember" id="tri_TaxProfessionalsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxValueOperatingLosses" id="tri_TaxValueOperatingLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TenPercentageWeakeningInForeignCurrencyVsUsMember" id="tri_TenPercentageWeakeningInForeignCurrencyVsUsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TermLoanFacilityMember" id="tri_TermLoanFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TextBlockAbstract" id="tri_TextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TheThomsonCorporationPLCPensionSchemeMember" id="tri_TheThomsonCorporationPLCPensionSchemeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThomsonReutersGroupPensionPlanMember" id="tri_ThomsonReutersGroupPensionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThreePointEightFiveNotesDueTwoThousandTwentyFourMember" id="tri_ThreePointEightFiveNotesDueTwoThousandTwentyFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThreePointNineFiveNotesDueTwoThousandTwentyOneMember" id="tri_ThreePointNineFiveNotesDueTwoThousandTwentyOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThreePointThreeFiveNotesDueTwoThousandTwentySixMember" id="tri_ThreePointThreeFiveNotesDueTwoThousandTwentySixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThreePointThreeSixNineNotesDueTwoThousandNineteenMember" id="tri_ThreePointThreeSixNineNotesDueTwoThousandNineteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ThreePointThreeZeroNineNotesDueTwoThousandTwentyOneMember" id="tri_ThreePointThreeZeroNineNotesDueTwoThousandTwentyOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TimeBasedRestrictedShareUnitMember" id="tri_TimeBasedRestrictedShareUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TotalAdjustmentsForDecreaseIncreaseInWorkingCapitalAndOtherItems" id="tri_TotalAdjustmentsForDecreaseIncreaseInWorkingCapitalAndOtherItems" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TotalCapitalMember" id="tri_TotalCapitalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TotalFutureInterestOutflows" id="tri_TotalFutureInterestOutflows" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TradeAndOtherReceivablesCarryingValue" id="tri_TradeAndOtherReceivablesCarryingValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TradeNamesFiniteUsefulLifeMember" id="tri_TradeNamesFiniteUsefulLifeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TradeNamesIndefiniteUsefulLifeMember" id="tri_TradeNamesIndefiniteUsefulLifeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TradeReceivablesCarryingValue" id="tri_TradeReceivablesCarryingValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TradeReceivablesRecognisedAsOfAcquisitionDate" id="tri_TradeReceivablesRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TransactionCosts" id="tri_TransactionCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TransactionsMember" id="tri_TransactionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TransactionsWithOfRelatedPartiesAxis" id="tri_TransactionsWithOfRelatedPartiesAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="TransactionsWithOfRelatedPartiesMember" id="tri_TransactionsWithOfRelatedPartiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TransitionalServicesMember" id="tri_TransitionalServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TreasuryStockActivityByTypeAxis" id="tri_TreasuryStockActivityByTypeAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="TreasuryStockActivityByTypeDomain" id="tri_TreasuryStockActivityByTypeDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TRGPAndTTCPlansMember" id="tri_TRGPAndTTCPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TTCPlansMember" id="tri_TTCPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TypeOneMember" id="tri_TypeOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TypesOfAgreementAxis" id="tri_TypesOfAgreementAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="TypesOfAgreementDomain" id="tri_TypesOfAgreementDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TypeThreeMember" id="tri_TypeThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TypeTwoMember" id="tri_TypeTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UncertainTaxPositions" id="tri_UncertainTaxPositions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UndiscountedCashFlowMember" id="tri_UndiscountedCashFlowMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UndistributedEarningsOfForeignSubsidiariesCurrent" id="tri_UndistributedEarningsOfForeignSubsidiariesCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnfundedPlansMember" id="tri_UnfundedPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnquotedPlanAssetsMember" id="tri_UnquotedPlanAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnrecognizedPlanAssets" id="tri_UnrecognizedPlanAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="USDollarMember" id="tri_USDollarMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UsTaxCutsAndJobsActTwoThousandSeventeenMember" id="tri_UsTaxCutsAndJobsActTwoThousandSeventeenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPeriodOfOtherEquityInstrument" id="tri_VestingPeriodOfOtherEquityInstrument" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageNumberOfSharesBasic" id="tri_WeightedAverageNumberOfSharesBasic" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageNumberOfVestedDSUs" id="tri_WeightedAverageNumberOfVestedDSUs" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WestMember" id="tri_WestMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WoodbridgeCancellationOfSharesSibMember" id="tri_WoodbridgeCancellationOfSharesSibMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WoodbridgeIssuanceQualifyingHoldcoAlternativeSibMember" id="tri_WoodbridgeIssuanceQualifyingHoldcoAlternativeSibMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WoodbridgeMember" id="tri_WoodbridgeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
