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  <xsd:element name="EquityAndInvestmentOptionAndFutureMember" id="mrh_EquityAndInvestmentOptionAndFutureMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrincipalReasonsForMovementInLossReservesByReasonAxis" id="mrh_PrincipalReasonsForMovementInLossReservesByReasonAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="LloydsCapitalTrustMember" id="mrh_LloydsCapitalTrustMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SyndicatedFiveYearFacilityIIExpiringInJune2012Member" id="mrh_SyndicatedFiveYearFacilityIIExpiringInJune2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Syndicated364DayFacilityIIExpiringInJune2013Member" id="mrh_Syndicated364DayFacilityIIExpiringInJune2013Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="InvestmentOptionsAndFuturesMember" id="mrh_InvestmentOptionsAndFuturesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PropertyCatastropheMember" id="mrh_PropertyCatastropheMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PropertySpecialtyMember" id="mrh_PropertySpecialtyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="PropertyAndIndividualRiskSpecialtyMember" id="mrh_PropertyAndIndividualRiskSpecialtyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="WorldwideMember" id="mrh_WorldwideMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="WesternEuropeExcludingGBAndIEMember" id="mrh_WesternEuropeExcludingGBAndIEMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="OtherRegionsMember" id="mrh_OtherRegionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ObligationsUnderLloydsCentralFundMember" id="mrh_ObligationsUnderLloydsCentralFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="FiveYearRSUAwardsGrantedIn2007Member" id="mrh_FiveYearRSUAwardsGrantedIn2007Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FourYearRSUAwardsGrantedIn2012Member" id="mrh_FourYearRSUAwardsGrantedIn2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="FourYearRSUAwardsGrantedIn2008Member" id="mrh_FourYearRSUAwardsGrantedIn2008Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="FourYearRSUAwardsGrantedIn2009Member" id="mrh_FourYearRSUAwardsGrantedIn2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="FourYearRSUAwardsGrantedIn2010Member" id="mrh_FourYearRSUAwardsGrantedIn2010Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OneYearRSUAwardsGrantedIn2011Member" id="mrh_OneYearRSUAwardsGrantedIn2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="ThreeYearRSUAwardsGrantedIn2011Member" id="mrh_ThreeYearRSUAwardsGrantedIn2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="FiveYearRSUAwardsGrantedIn2011Member" id="mrh_FiveYearRSUAwardsGrantedIn2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CountryAxis" id="mrh_CountryAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AustralianFloods2010Member" id="mrh_AustralianFloods2010Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CasualtyReserves2007AndPriorMember" id="mrh_CasualtyReserves2007AndPriorMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetForeignExchangeTransactionLossesMember" id="mrh_NetForeignExchangeTransactionLossesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CasualtyLosses2007AndPriorMember" id="mrh_CasualtyLosses2007AndPriorMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonCatastrophePropertyReserves2008Member" id="mrh_NonCatastrophePropertyReserves2008Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SwapOnTrustPreferredSecuritiesMember" id="mrh_SwapOnTrustPreferredSecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FourYearPerformanceCycleFrom2012To2015Member" id="mrh_FourYearPerformanceCycleFrom2012To2015Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="JapanEarthquake2011Member" id="mrh_JapanEarthquake2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DanishCloudburst2011Member" id="mrh_DanishCloudburst2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FireLosses2011And2010Member" id="mrh_FireLosses2011And2010Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonCatastrophePropertyReserves2011Member" id="mrh_NonCatastrophePropertyReserves2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonCatastrophePropertyReserves2009Member" id="mrh_NonCatastrophePropertyReserves2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FiveYearPerformanceCycleFrom2012To2016Member" id="mrh_FiveYearPerformanceCycleFrom2012To2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashBasedRSUsMember" id="mrh_CashBasedRSUsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestrictedStockUnitsFixedMember" id="mrh_RestrictedStockUnitsFixedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NewZealandEarthquakes2011Member" id="mrh_NewZealandEarthquakes2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherCatastropheEvents2011And2010Member" id="mrh_OtherCatastropheEvents2011And2010Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Hurricanes2004And2005Member" id="mrh_Hurricanes2004And2005Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MarineLosses2010Member" id="mrh_MarineLosses2010Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DocumentAndEntityInformationAbstract" id="mrh_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MarketableSecuritiesEquitySecuritiesAtCost" id="mrh_MarketableSecuritiesEquitySecuritiesAtCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="MarketableSecuritiesFixedMaturitiesAmortizedCost" id="mrh_MarketableSecuritiesFixedMaturitiesAmortizedCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="OtherInvestmentAndSecuritiesAtCost" id="mrh_OtherInvestmentAndSecuritiesAtCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="GrossPremiumsWritten" id="mrh_GrossPremiumsWritten" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="UnderwritingExpensesAbstract" id="mrh_UnderwritingExpensesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="AdjustmentOnTerminationOfDerivativeAgreements" id="mrh_AdjustmentOnTerminationOfDerivativeAgreements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="MinorityInterestDecreaseFromDistributionsAndRedemptionsToNoncontrollingInterestHolders" id="mrh_MinorityInterestDecreaseFromDistributionsAndRedemptionsToNoncontrollingInterestHolders" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TaxWithholdingOnShareBasedCompensation" id="mrh_TaxWithholdingOnShareBasedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TreasuryStockAcquiredAndCommonStockRepurchasedAndRetired" id="mrh_TreasuryStockAcquiredAndCommonStockRepurchasedAndRetired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NetRealizedAndUnrealizedGainsLossesOnInvestmentRelatedDerivativeInstruments" id="mrh_NetRealizedAndUnrealizedGainsLossesOnInvestmentRelatedDerivativeInstruments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsToAcquireMarketableSecuritiesFixedMaturities" id="mrh_PaymentsToAcquireMarketableSecuritiesFixedMaturities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsToAcquireTradingSecurities" id="mrh_PaymentsToAcquireTradingSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SettlementsOfInvestmentRelatedDerivativeInstruments" id="mrh_SettlementsOfInvestmentRelatedDerivativeInstruments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsForAccruedInvestmentFees" id="mrh_PaymentsForAccruedInvestmentFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentForCertainClosingExpensesAssociatedWithSaleOfEntity" id="mrh_PaymentForCertainClosingExpensesAssociatedWithSaleOfEntity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsOfDividendsAndOtherPaymentsToMinorityShareholdersCommonStock" id="mrh_PaymentsOfDividendsAndOtherPaymentsToMinorityShareholdersCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsOfDividendsAndOtherPaymentsToMinorityShareholdersPreferenceStock" id="mrh_PaymentsOfDividendsAndOtherPaymentsToMinorityShareholdersPreferenceStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsForSecuritiesLendingPayable" id="mrh_PaymentsForSecuritiesLendingPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RegulatoryRequirementsDisclosureTextBlock" id="mrh_RegulatoryRequirementsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SharesHeldInTreasuryPolicyTextBlock" id="mrh_SharesHeldInTreasuryPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfForeignCurrencyExchangeTableTextBlock" id="mrh_ScheduleOfForeignCurrencyExchangeTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ComponentsOfReservesForLossesAndLossAdjustmentExpensesTableTextBlock" id="mrh_ComponentsOfReservesForLossesAndLossAdjustmentExpensesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfReinsurersRelatedToReinsuranceRecoverableOnPaidLossesTableTextBlock" id="mrh_ScheduleOfReinsurersRelatedToReinsuranceRecoverableOnPaidLossesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfReinsurersRelatedToReinsuranceRecoverableOnUnpaidLossesTableTextBlock" id="mrh_ScheduleOfReinsurersRelatedToReinsuranceRecoverableOnUnpaidLossesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfDirectAssumedCededPremiumsLossesAndLossAdjustmentExpensesTableTextBlock" id="mrh_ScheduleOfDirectAssumedCededPremiumsLossesAndLossAdjustmentExpensesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfOtherInvestmentsTableTextBlock" id="mrh_ScheduleOfOtherInvestmentsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfOperationsByBusinessSegmentsTableTextBlock" id="mrh_ScheduleOfOperationsByBusinessSegmentsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfAssetsByBusinessSegmentsTableTextBlock" id="mrh_ScheduleOfAssetsByBusinessSegmentsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfPremiumsWrittenGrossByLineOfBusinessAndReportableSegmentTableTextBlock" id="mrh_ScheduleOfPremiumsWrittenGrossByLineOfBusinessAndReportableSegmentTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfPremiumsWrittenGrossByGeographicAreasTableTextBlock" id="mrh_ScheduleOfPremiumsWrittenGrossByGeographicAreasTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfPremiumsEarnedNetByLineOfBusinessAndReportableSegmentTableTextBlock" id="mrh_ScheduleOfPremiumsEarnedNetByLineOfBusinessAndReportableSegmentTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfPremiumsEarnedNetByGeographicAreasTableTextBlock" id="mrh_ScheduleOfPremiumsEarnedNetByGeographicAreasTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfFixedAndVariableRestrictedStockUnitsOutstandingAndUnamortizedGrantDateFairValueByAwardCycleUnderIncentivePlanTableTextBlock" id="mrh_ScheduleOfFixedAndVariableRestrictedStockUnitsOutstandingAndUnamortizedGrantDateFairValueByAwardCycleUnderIncentivePlanTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RiskPeriodOfInsuranceContractsPremiumsEarnedRatablyOverTermMaximum" id="mrh_RiskPeriodOfInsuranceContractsPremiumsEarnedRatablyOverTermMaximum" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RiskPeriodOfInsuranceContractsPremiumsEarnedPredetermined" id="mrh_RiskPeriodOfInsuranceContractsPremiumsEarnedPredetermined" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInPremiumDeficiency" id="mrh_IncreaseDecreaseInPremiumDeficiency" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfKeyJudgementsRequiredForRecognitionOfReinsuranceRecoverable" id="mrh_NumberOfKeyJudgementsRequiredForRecognitionOfReinsuranceRecoverable" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NoninterestExpenseRelatedToPerformanceFeesForInvestmentRelatedDerivativeInstruments" id="mrh_NoninterestExpenseRelatedToPerformanceFeesForInvestmentRelatedDerivativeInstruments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TermOfMaturitiesOfFixedIncomeInvestmentsForDeterminiationOfCashAndCashEquivalents" id="mrh_TermOfMaturitiesOfFixedIncomeInvestmentsForDeterminiationOfCashAndCashEquivalents" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashCollateralForShortSaleInvestmentsAndDerivativeInstruments" id="mrh_CashCollateralForShortSaleInvestmentsAndDerivativeInstruments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DepositsOverseas" id="mrh_DepositsOverseas" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="CashCollateralForSecuritiesSold" id="mrh_CashCollateralForSecuritiesSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="CurrencyTable" id="mrh_CurrencyTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CurrencyLineItems" id="mrh_CurrencyLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GainsLossOnIssuanceOfTreasuryShares" id="mrh_GainsLossOnIssuanceOfTreasuryShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="FundsWithheldAbstract" id="mrh_FundsWithheldAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RecognizedCreditRatingAgencyAndRatingOrGuaranteeDomain" id="mrh_RecognizedCreditRatingAgencyAndRatingOrGuaranteeDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="NumberOfStatesAuthorizedOrTrusteedReinsurerStatusIn" id="mrh_NumberOfStatesAuthorizedOrTrusteedReinsurerStatusIn" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
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  <xsd:element name="CashAndCashEquivalentsAndInvestmentsHeldInTrust" id="mrh_CashAndCashEquivalentsAndInvestmentsHeldInTrust" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
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  <xsd:element name="ProceedsFromMaturitiesCallsAndPaydownsOfInvestments" id="mrh_ProceedsFromMaturitiesCallsAndPaydownsOfInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AmountToBeReturnedIfPlaintiffsFullyPrevailUnderTribuneLBOSuits" id="mrh_AmountToBeReturnedIfPlaintiffsFullyPrevailUnderTribuneLBOSuits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LloydsStandbyLetterOfCreditFacilityMember" id="mrh_LloydsStandbyLetterOfCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SyndicatedFacilityTrancheBExpiringInAug2010Member" id="mrh_SyndicatedFacilityTrancheBExpiringInAug2010Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Syndicated5YearFacilityIExpiringInJune2011Member" id="mrh_Syndicated5YearFacilityIExpiringInJune2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Syndicated364DayFacilityIIExpiringInJune2012Member" id="mrh_Syndicated364DayFacilityIIExpiringInJune2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LetterOfCreditFacilitiesAbstract" id="mrh_LetterOfCreditFacilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantTermsLeverageRatioMaximum" id="mrh_DebtInstrumentCovenantTermsLeverageRatioMaximum" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityTerminatedAmount" id="mrh_LineOfCreditFacilityTerminatedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="MaximumPeriodOfContinuationOfOutstandingLettersOfCredit" id="mrh_MaximumPeriodOfContinuationOfOutstandingLettersOfCredit" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="LineOfCreditFacilityUsedCapacityCommitmentFeePercentage" id="mrh_LineOfCreditFacilityUsedCapacityCommitmentFeePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityCollateralAmount" id="mrh_LineOfCreditFacilityCollateralAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="SwapAgreementTerm" id="mrh_SwapAgreementTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrustArrangementsAbstract" id="mrh_TrustArrangementsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InitialMinimumValueOfReinsuranceTrust" id="mrh_InitialMinimumValueOfReinsuranceTrust" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="InitialMinimumValueOfCapitalTrust" id="mrh_InitialMinimumValueOfCapitalTrust" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReinsuranceLiabilitiesToCedants" id="mrh_ReinsuranceLiabilitiesToCedants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CATBondProtectionMember" id="mrh_CATBondProtectionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DerivativeSwapMaximumRecovery" id="mrh_DerivativeSwapMaximumRecovery" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AmountOfProtectionProvidedByILWContract" id="mrh_AmountOfProtectionProvidedByILWContract" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ConsiderationForDerivativeContract" id="mrh_ConsiderationForDerivativeContract" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DerivativeSwapFixedRatePayment" id="mrh_DerivativeSwapFixedRatePayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IssuanceOfCatastropheBondsByThirdParty" id="mrh_IssuanceOfCatastropheBondsByThirdParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="USTreasuryContractMember" id="mrh_USTreasuryContractMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IssuanceOfCatastropheBondsByThirdPartyNumberOfTranches" id="mrh_IssuanceOfCatastropheBondsByThirdPartyNumberOfTranches" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DerivativeContractPaymentsAsPercentageOfFirstTrancheOfCatastropheBondsByThirdParty" id="mrh_DerivativeContractPaymentsAsPercentageOfFirstTrancheOfCatastropheBondsByThirdParty" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DerivativeContractPaymentsAsPercentageOfSecondTrancheOfCatastropheBondsByThirdParty" id="mrh_DerivativeContractPaymentsAsPercentageOfSecondTrancheOfCatastropheBondsByThirdParty" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionOfCommonStockAbstract" id="mrh_AcquisitionOfCommonStockAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockRetiredAsPerShareIssuanceAgreement" id="mrh_StockRetiredAsPerShareIssuanceAgreement" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedAbstract" id="mrh_StockIssuedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesRestrictedStockUnitsRSUsGross" id="mrh_StockIssuedDuringPeriodSharesRestrictedStockUnitsRSUsGross" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesForDirectorShareUnitsGross" id="mrh_StockIssuedDuringPeriodSharesForDirectorShareUnitsGross" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockRepurchasedDuringPeriodSharesPricePerShare" id="mrh_StockRepurchasedDuringPeriodSharesPricePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PreferredStockDividendsPayableAmount" id="mrh_PreferredStockDividendsPayableAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfVotesPerCommonShareHeld" id="mrh_NumberOfVotesPerCommonShareHeld" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="PaymentsForStockRetiredAsPerShareIssuanceAgreementPerShare" id="mrh_PaymentsForStockRetiredAsPerShareIssuanceAgreementPerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfVotesPerPreferredShareHeldInExtraordinaryInstances" id="mrh_NumberOfVotesPerPreferredShareHeldInExtraordinaryInstances" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfAdditionalDirectorsThatCanBeElectedByPreferredShareholders" id="mrh_NumberOfAdditionalDirectorsThatCanBeElectedByPreferredShareholders" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="IncomeAbstract" id="mrh_IncomeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignCurrencyTransactionGainLossAndInvestment" id="mrh_ForeignCurrencyTransactionGainLossAndInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="InsuranceUnderwritingIncomeLoss" id="mrh_InsuranceUnderwritingIncomeLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReinsurancePremiumsForInsuranceCompaniesByProductAndSegmentAndByGeographyAbstract" id="mrh_ReinsurancePremiumsForInsuranceCompaniesByProductAndSegmentAndByGeographyAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageGrossPremiumWrittenByRegion" id="mrh_PercentageGrossPremiumWrittenByRegion" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PremiumsWrittenNetPropertyAndCasualtyBySegmentAndByGeographyAbstract" id="mrh_PremiumsWrittenNetPropertyAndCasualtyBySegmentAndByGeographyAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageNetPremiumEarnedByRegion" id="mrh_PercentageNetPremiumEarnedByRegion" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetIncomeLossAvailableToCommonStockholdersNetOfAllocationsToParticipatingSecurities" id="mrh_NetIncomeLossAvailableToCommonStockholdersNetOfAllocationsToParticipatingSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPrivateInvestmentFunds" id="mrh_NumberOfPrivateInvestmentFunds" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="OperatingLeasesFutureMinimumPaymentsDueInFiveYearsAndThereafter" id="mrh_OperatingLeasesFutureMinimumPaymentsDueInFiveYearsAndThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LevyImposedAsPercentageOfPremiumsWritten" id="mrh_LevyImposedAsPercentageOfPremiumsWritten" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProbableAdditionalContributionAsPercentageOfUnderwritingCapacityMaximum" id="mrh_ProbableAdditionalContributionAsPercentageOfUnderwritingCapacityMaximum" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EstimatedObligationToCentralFundForAnnualContribution" id="mrh_EstimatedObligationToCentralFundForAnnualContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AnnualSubscriptionChargeAsPercentageOfPremiumWritten" id="mrh_AnnualSubscriptionChargeAsPercentageOfPremiumWritten" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EstimatedObligationForAnnualSubscriptionCharges" id="mrh_EstimatedObligationForAnnualSubscriptionCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ConcentrationRiskPercentageMaximumBasedOnAggregateInvestmentInSingleEntity" id="mrh_ConcentrationRiskPercentageMaximumBasedOnAggregateInvestmentInSingleEntity" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MinimumTargetCapitalLevelAsPercentageOfEnhancedCapitalRequirement" id="mrh_MinimumTargetCapitalLevelAsPercentageOfEnhancedCapitalRequirement" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DividendDistributionWithoutPriorApprovalFromRegulatoryAgencyPercentageOfPriorYearStatutoryCapitalAndSurplus" id="mrh_DividendDistributionWithoutPriorApprovalFromRegulatoryAgencyPercentageOfPriorYearStatutoryCapitalAndSurplus" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DividendDistributionWithoutPriorApprovalFromRegulatoryAgencyPercentageOfReductionPriorYearStatutoryCapital" id="mrh_DividendDistributionWithoutPriorApprovalFromRegulatoryAgencyPercentageOfReductionPriorYearStatutoryCapital" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="PeriodAfterClosingOfOpenUnderwritingYearForDistributionOfProfitsHeld" id="mrh_PeriodAfterClosingOfOpenUnderwritingYearForDistributionOfProfitsHeld" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RegulatoryRequirementsTable" id="mrh_RegulatoryRequirementsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RegulatoryRequirementsLineItems" id="mrh_RegulatoryRequirementsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashAndCashEquivalentsHeldWithinPremiumsTrustFunds" id="mrh_CashAndCashEquivalentsHeldWithinPremiumsTrustFunds" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="InvestmentSecuritiesHeldWithinPremiumsTrustFunds" id="mrh_InvestmentSecuritiesHeldWithinPremiumsTrustFunds" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="StatutoryAccountingPracticesStatutoryCapitalAndSurplusVariationsAmount" id="mrh_StatutoryAccountingPracticesStatutoryCapitalAndSurplusVariationsAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfAdditionalStatesInWhichEntityOperates" id="mrh_NumberOfAdditionalStatesInWhichEntityOperates" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MaximumNumberOfAdmittedCarriersRequiredToDeclineRisk" id="mrh_MaximumNumberOfAdmittedCarriersRequiredToDeclineRisk" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MaximumDividendAvailableForDistributionWithoutPriorApprovalFromRegulatoryAgencyAsPercentageOfStatutoryCapitalAndSurplusAtTheEndOfPreviousCalendarYear" id="mrh_MaximumDividendAvailableForDistributionWithoutPriorApprovalFromRegulatoryAgencyAsPercentageOfStatutoryCapitalAndSurplusAtTheEndOfPreviousCalendarYear" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MaximumDividendAvailableForDistributionWithoutPriorApprovalFromRegulatoryAgencyAsPercentageOfStatutoryNetIncomeFromOperationsForPreviousCalendarYear" id="mrh_MaximumDividendAvailableForDistributionWithoutPriorApprovalFromRegulatoryAgencyAsPercentageOfStatutoryNetIncomeFromOperationsForPreviousCalendarYear" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MinimumPercentageOfAcquisitionOfOutstandingVotingSecuritiesSubjectToPriorApprovalOfRegulatoryAgency" id="mrh_MinimumPercentageOfAcquisitionOfOutstandingVotingSecuritiesSubjectToPriorApprovalOfRegulatoryAgency" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfRegulatorsToReplaceFSA" id="mrh_NumberOfRegulatorsToReplaceFSA" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermIncentivePlanMember" id="mrh_LongTermIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByPerformanceSharesAwardPerformanceCycleDomain" id="mrh_ShareBasedCompensationArrangementByPerformanceSharesAwardPerformanceCycleDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FourYearPerformanceCycleFrom2009To2012Member" id="mrh_FourYearPerformanceCycleFrom2009To2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FourYearPerformanceCycleFrom2008To2011Member" id="mrh_FourYearPerformanceCycleFrom2008To2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedGrantsInPeriodAtTargetROE" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedGrantsInPeriodAtTargetROE" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TargetReturnOnEquity" id="mrh_TargetReturnOnEquity" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ThresholdReturnOnEquity" id="mrh_ThresholdReturnOnEquity" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MaximumReturnOnEquity" id="mrh_MaximumReturnOnEquity" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedGrantsInPeriodAtMaximumROE" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedGrantsInPeriodAtMaximumROE" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIncreaseDecreaseInProjections" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIncreaseDecreaseInProjections" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAtTargetIncreaseDecreaseInProjections" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAtTargetIncreaseDecreaseInProjections" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnamortizedGrantDateFairValueRollForward" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnamortizedGrantDateFairValueRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnamortizedGrantDateFairValueOutstanding" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnamortizedGrantDateFairValueOutstanding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValueAwarded" id="mrh_EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValueAwarded" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValueIncreaseDecreaseInProjections" id="mrh_EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValueIncreaseDecreaseInProjections" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValueAtTargetIncreaseDecreaseInProjections" id="mrh_EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValueAtTargetIncreaseDecreaseInProjections" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValueForfeitures" id="mrh_EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValueForfeitures" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateImpactOfEquityBasedAwardsPaidOnUnitsOutstanding" id="mrh_EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateImpactOfEquityBasedAwardsPaidOnUnitsOutstanding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardInitialAwardCyclePeriod" id="mrh_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardInitialAwardCyclePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="PerformanceSharesNotSubjectToSwingFactorMember" id="mrh_PerformanceSharesNotSubjectToSwingFactorMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PerformanceSharesSubjectToSwingFactorMember" id="mrh_PerformanceSharesSubjectToSwingFactorMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DirectorsSharePlanMember" id="mrh_DirectorsSharePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PerformanceCycleFrom2007To2009Member" id="mrh_PerformanceCycleFrom2007To2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PerformanceCycleFrom2006To2008Member" id="mrh_PerformanceCycleFrom2006To2008Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfTargetRSUsActuallyAwarded" id="mrh_PercentageOfTargetRSUsActuallyAwarded" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TaxWithholdingOnShareBasedCompensationNumber" id="mrh_TaxWithholdingOnShareBasedCompensationNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValuePayments" id="mrh_EmployeeServiceShareBasedCompensationNonvestedAwardsFixedRSUsAwardedTotalCompensationCostNotYetRecognizedGrantDateFairValuePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureAssumptionsExpectedRate" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureAssumptionsExpectedRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RSUByAwardCycleAbstract" id="mrh_RSUByAwardCycleAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpectedRSUExpenseInRemainderOfFiscalYear" id="mrh_ExpectedRSUExpenseInRemainderOfFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ExpectedRSUExpenseInFirstFullFiscalYear" id="mrh_ExpectedRSUExpenseInFirstFullFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ExpectedRSUExpenseInSecondFullFiscalYearAndBeyond" id="mrh_ExpectedRSUExpenseInSecondFullFiscalYearAndBeyond" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformancePeriod" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformancePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageOfAwardsEarnedBasedOnPerformance" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageOfAwardsEarnedBasedOnPerformance" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncreaseDecreaseInPercentageOfAwardsEarnedBasedOnAdditionalPerformanceCriteria" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncreaseDecreaseInPercentageOfAwardsEarnedBasedOnAdditionalPerformanceCriteria" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsROACAchieved" id="mrh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsROACAchieved" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeFromInvestmentsDerivativesAndCashAndCashEquivalent" id="mrh_IncomeFromInvestmentsDerivativesAndCashAndCashEquivalent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StandardizedReturnOnInvestmentsAndCashAndCashEquivalents" id="mrh_StandardizedReturnOnInvestmentsAndCashAndCashEquivalents" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="MultiplierUsedForComputationOfStandardizedReturnOnInvestmentsAndCashAndCashEquivalents" id="mrh_MultiplierUsedForComputationOfStandardizedReturnOnInvestmentsAndCashAndCashEquivalents" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpectedRSUExpenseInSecondFullFiscalYear" id="mrh_ExpectedRSUExpenseInSecondFullFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ExpectedRSUExpenseInThirdFullFiscalYearAndBeyond" id="mrh_ExpectedRSUExpenseInThirdFullFiscalYearAndBeyond" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxesTable" id="mrh_IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonUSCountriesMember" id="mrh_NonUSCountriesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxesLineItems" id="mrh_IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UncertainTaxPositionsPercentageOfLikelihoodOfBeingSustained" id="mrh_UncertainTaxPositionsPercentageOfLikelihoodOfBeingSustained" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeignAbstract" id="mrh_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeignAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomesticAbstract" id="mrh_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomesticAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxExpenseBenefitMaximum" id="mrh_IncomeTaxExpenseBenefitMaximum" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="StateAndLocalIncomeTaxExpenseBenefitContinuingOperationsMaximum" id="mrh_StateAndLocalIncomeTaxExpenseBenefitContinuingOperationsMaximum" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxReconciliationForeignIncomeTaxRateAbstract" id="mrh_IncomeTaxReconciliationForeignIncomeTaxRateAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxReconciliationIncomeTaxExpenseBenefitAtDomesticIncomeTaxRate" id="mrh_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtDomesticIncomeTaxRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxesPaidMaximum" id="mrh_IncomeTaxesPaidMaximum" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SupplementalInformationForPropertyCasualtyInsuranceUnderwritersClaimsAndClaimsAdjustmentExpenseAbstract" id="mrh_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersClaimsAndClaimsAdjustmentExpenseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ComponentsOfLossAndLossAdjustmentExpenseReservesAbstract" id="mrh_ComponentsOfLossAndLossAdjustmentExpenseReservesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ComponentsOfReserveForLossesAndLossAdjustmentExpensesAbstract" id="mrh_ComponentsOfReserveForLossesAndLossAdjustmentExpensesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReserveForLossesAndLossAdjustmentExpensesIncurredButNotReportedIBNRClaimsReserves" id="mrh_ReserveForLossesAndLossAdjustmentExpensesIncurredButNotReportedIBNRClaimsReserves" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReserveForLossesAndLossAdjustmentExpensesReportedClaimsAmount" id="mrh_ReserveForLossesAndLossAdjustmentExpensesReportedClaimsAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LossesAndLossAdjustmentExpensesAbstract" id="mrh_LossesAndLossAdjustmentExpensesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FirstEquityForwardSaleAgreementMember" id="mrh_FirstEquityForwardSaleAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SecondEquityForwardSaleAgreementMember" id="mrh_SecondEquityForwardSaleAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SecondEquityForwardSaleAgreementFirstTrancheMember" id="mrh_SecondEquityForwardSaleAgreementFirstTrancheMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SecondEquityForwardSaleAgreementSecondTrancheMember" id="mrh_SecondEquityForwardSaleAgreementSecondTrancheMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfEquityForwardSaleAgreementsEntered" id="mrh_NumberOfEquityForwardSaleAgreementsEntered" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DerivativeNumberOfTranches" id="mrh_DerivativeNumberOfTranches" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DerivativeNonmonetaryNotionalAmountPerTranche" id="mrh_DerivativeNonmonetaryNotionalAmountPerTranche" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CommonStockSharesIssuedAndOutstandingUnderShareIssuanceAgreement" id="mrh_CommonStockSharesIssuedAndOutstandingUnderShareIssuanceAgreement" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NotionalNumberOfSharesIssuedDueToEarlySettlementOfDerivativeAndShareIssuanceAgreement" id="mrh_NotionalNumberOfSharesIssuedDueToEarlySettlementOfDerivativeAndShareIssuanceAgreement" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NotionalPriceForSharesIssuedDueToEarlySettlementOfDerivativeAndShareIssuanceAgreement" id="mrh_NotionalPriceForSharesIssuedDueToEarlySettlementOfDerivativeAndShareIssuanceAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserveAndDeferredAcquisitionCost" id="mrh_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserveAndDeferredAcquisitionCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredTaxLiabilitiesDeferredPremiumRevenue" id="mrh_DeferredTaxLiabilitiesDeferredPremiumRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="DeferredTaxLiabilitiesValuationAllowance" id="mrh_DeferredTaxLiabilitiesValuationAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredTaxLiabilitiesNet" id="mrh_DeferredTaxLiabilitiesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfSubsidiariesInvolvedInRecharacterizationOfIntercompanyLoan" id="mrh_NumberOfSubsidiariesInvolvedInRecharacterizationOfIntercompanyLoan" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxExpenseBenefitDueToReRecharacterizationOfIntercompanyLoan" id="mrh_IncomeTaxExpenseBenefitDueToReRecharacterizationOfIntercompanyLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DecreaseInDeferredTaxAssetsDueToSignificantAcquisitionsAndDisposals" id="mrh_DecreaseInDeferredTaxAssetsDueToSignificantAcquisitionsAndDisposals" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="WilburLRossJrAndInvestmentFundsManagedByWLRossAndCoLLCMember" id="mrh_WilburLRossJrAndInvestmentFundsManagedByWLRossAndCoLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="KVOCapitalManagementLLCMember" id="mrh_KVOCapitalManagementLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="KVOOffshoreFundLtdMember" id="mrh_KVOOffshoreFundLtdMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentFundsManagedByWLRossAndCoLLCMember" id="mrh_InvestmentFundsManagedByWLRossAndCoLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionPerformanceCriteriaFee" id="mrh_RelatedPartyTransactionPerformanceCriteriaFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="StockRepurchasedDuringPeriodSharesAsPercentageOfCommonSharesOutstanding" id="mrh_StockRepurchasedDuringPeriodSharesAsPercentageOfCommonSharesOutstanding" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionPeriodForWhichAgreementsWithRelatedPartyCanBeRenewed" id="mrh_RelatedPartyTransactionPeriodForWhichAgreementsWithRelatedPartyCanBeRenewed" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionConsultingFeePercentage" id="mrh_RelatedPartyTransactionConsultingFeePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionManagementFeePercentage" id="mrh_RelatedPartyTransactionManagementFeePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionAnnualIncentiveFeesPercentage" id="mrh_RelatedPartyTransactionAnnualIncentiveFeesPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionPermissibleInvestmentInRelatedParty" id="mrh_RelatedPartyTransactionPermissibleInvestmentInRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionAmountWithdrawnFromInvestmentAccount" id="mrh_RelatedPartyTransactionAmountWithdrawnFromInvestmentAccount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionAmountInvestedInRelatedParty" id="mrh_RelatedPartyTransactionAmountInvestedInRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionExpectedInvestmentAccountBalance" id="mrh_RelatedPartyTransactionExpectedInvestmentAccountBalance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionLockUpPeriodForFirstHalfOfInvestment" id="mrh_RelatedPartyTransactionLockUpPeriodForFirstHalfOfInvestment" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionLockUpPeriodForSecondHalfOfInvestment" id="mrh_RelatedPartyTransactionLockUpPeriodForSecondHalfOfInvestment" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionInvestmentRedemptionFeePercentage" id="mrh_RelatedPartyTransactionInvestmentRedemptionFeePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="PaymentsToRelatedParty" id="mrh_PaymentsToRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionPercentageOfOwnershipByRelatedParty" id="mrh_RelatedPartyTransactionPercentageOfOwnershipByRelatedParty" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionIncentiveFeesPaidToRelatedParty" id="mrh_RelatedPartyTransactionIncentiveFeesPaidToRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="FullyConvertedBookValuePerShare" id="mrh_FullyConvertedBookValuePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FullyConvertedTangibleBookValuePerShare" id="mrh_FullyConvertedTangibleBookValuePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnderwritingExpense" id="mrh_UnderwritingExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CorporateBondsAndAssetBackedSecuritiesMember" id="mrh_CorporateBondsAndAssetBackedSecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments" id="mrh_IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentOfContributionsOfCapitalToSubsidiaries" id="mrh_PaymentOfContributionsOfCapitalToSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromReturnOfInvestmentInSubsidiariesAndAffiliates" id="mrh_ProceedsFromReturnOfInvestmentInSubsidiariesAndAffiliates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BlueWaterTrustMember" id="mrh_BlueWaterTrustMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="JapanWindSwapMember" id="mrh_JapanWindSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EngineeringSwapMember" id="mrh_EngineeringSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="USEventSwapMember" id="mrh_USEventSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeTransactionGainsLossesRelatedToPriorYearLossAndLAE" id="mrh_ForeignExchangeTransactionGainsLossesRelatedToPriorYearLossAndLAE" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeContractInvestingActivityMember" id="mrh_ForeignExchangeContractInvestingActivityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnsecuredSeniorNotes4.70PercentDueOctober2022Member" id="mrh_UnsecuredSeniorNotes4.70PercentDueOctober2022Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentIssuanceAsPercentageOfParValue" id="mrh_DebtInstrumentIssuanceAsPercentageOfParValue" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentRedemptionPriceAsPercentageOfPrincipalAmount" id="mrh_DebtInstrumentRedemptionPriceAsPercentageOfPrincipalAmount" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ContingentNoteReceivable" id="mrh_ContingentNoteReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AdjustmentsToAdditionalPaidInCapitalOtherMaximum" id="mrh_AdjustmentsToAdditionalPaidInCapitalOtherMaximum" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
</xsd:schema>
