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  <xs:element id="hg_TermLoanMember" abstract="true" name="TermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hg_UncommittedSecuredLetterOfCreditFacilityMember" abstract="true" name="UncommittedSecuredLetterOfCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hg_UnsecuredFacilityMember" abstract="true" name="UnsecuredFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hg_BankOfMontrealLetterOfCreditFacilityMember" abstract="true" name="BankOfMontrealLetterOfCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hg_UBSLetterOfCreditFacilityMember" abstract="true" name="UBSLetterOfCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hg_UnsecuredFacilityLloydsMember" abstract="true" name="UnsecuredFacilityLloydsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hg_DebtInstrumentInterestRateIncreaseDecreaseInEventOfDefault" abstract="false" name="DebtInstrumentInterestRateIncreaseDecreaseInEventOfDefault" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="hg_FixedIncomePortfolioMember" abstract="true" name="FixedIncomePortfolioMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hg_UnclassifiedCommonClassMember" abstract="true" name="UnclassifiedCommonClassMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hg_CommonStockSharesAuthorizedConversionOfConvertibleSecurities" abstract="false" name="CommonStockSharesAuthorizedConversionOfConvertibleSecurities" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="hg_CommonStockSharesAuthorizedIncreaseDecrease" abstract="false" name="CommonStockSharesAuthorizedIncreaseDecrease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="hg_CommonStockVotingRightsClassAAndClassBLimitationAsAPercent" abstract="false" name="CommonStockVotingRightsClassAAndClassBLimitationAsAPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="hg_AlexBakerMember" abstract="true" name="AlexBakerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
