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    <link:label id="lab_int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember_D1F4142B39D0F6A010137DFF331813FB_label_en-US" xlink:label="lab_int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember_D1F4142B39D0F6A010137DFF331813FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Agreements With Executive Officers And Key Employees [Member]</link:label>
    <link:label id="lab_int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember_D1F4142B39D0F6A010137DFF331813FB_documentation_en-US" xlink:label="lab_int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember_D1F4142B39D0F6A010137DFF331813FB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to agreements with executive officers and key employees.</link:label>
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    <link:label id="lab_us-gaap_LossContingenciesLineItems_7026D6B49DFB134814D67DFF33192663_verboseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_7026D6B49DFB134814D67DFF33192663" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loss contingencies</link:label>
    <link:label id="lab_us-gaap_LossContingenciesLineItems_7026D6B49DFB134814D67DFF33192663_label_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_7026D6B49DFB134814D67DFF33192663" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_7026D6B49DFB134814D67DFF33192663" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesLineItems_7026D6B49DFB134814D67DFF33192663" xlink:to="lab_us-gaap_LossContingenciesLineItems_7026D6B49DFB134814D67DFF33192663" xlink:type="arc" />
    <link:label id="lab_int_LossContingencyAnnualBaseSalaryUnderAgreement_C44E2F03CC8E8095E7E17DFF331910CF_terseLabel_en-US" xlink:label="lab_int_LossContingencyAnnualBaseSalaryUnderAgreement_C44E2F03CC8E8095E7E17DFF331910CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual base salary</link:label>
    <link:label id="lab_int_LossContingencyAnnualBaseSalaryUnderAgreement_C44E2F03CC8E8095E7E17DFF331910CF_label_en-US" xlink:label="lab_int_LossContingencyAnnualBaseSalaryUnderAgreement_C44E2F03CC8E8095E7E17DFF331910CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Annual Base Salary under Agreement</link:label>
    <link:label id="lab_int_LossContingencyAnnualBaseSalaryUnderAgreement_C44E2F03CC8E8095E7E17DFF331910CF_documentation_en-US" xlink:label="lab_int_LossContingencyAnnualBaseSalaryUnderAgreement_C44E2F03CC8E8095E7E17DFF331910CF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the annual base salary under the agreement.</link:label>
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    <link:label id="lab_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_DFC473AEF20F7147D78F7DFF3319CC15_terseLabel_en-US" xlink:label="lab_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_DFC473AEF20F7147D78F7DFF3319CC15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Agreement expiration term, extension under specified condition</link:label>
    <link:label id="lab_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_DFC473AEF20F7147D78F7DFF3319CC15_label_en-US" xlink:label="lab_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_DFC473AEF20F7147D78F7DFF3319CC15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Agreement Expiration Term, Extension Under Specified Condition</link:label>
    <link:label id="lab_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_DFC473AEF20F7147D78F7DFF3319CC15_documentation_en-US" xlink:label="lab_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_DFC473AEF20F7147D78F7DFF3319CC15" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the term of extension in the expiration period of the agreement.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition" xlink:label="loc_int_LossContingencyAgreementExpirationTermExtensionUnderSpecifiedCondition_DFC473AEF20F7147D78F7DFF3319CC15" xlink:type="locator" />
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    <link:label id="lab_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42_terseLabel_en-US" xlink:label="lab_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum period prior to expiration of the term for serving specified notice to prevent extension of the agreement term</link:label>
    <link:label id="lab_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42_label_en-US" xlink:label="lab_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Agreement Minimum Period Prior to Expiration Term for Serving Specified Notice to Prevent Extension of Agreement Term</link:label>
    <link:label id="lab_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42_documentation_en-US" xlink:label="lab_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the minimum period prior to expiration of the term for serving the specified notice to prevent extension of the agreement term.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm" xlink:label="loc_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42" xlink:to="lab_int_LossContingencyAgreementMinimumPeriodPriorToExpirationTermForServingSpecifiedNoticeToPreventExtensionOfAgreementTerm_D794789BBFB5B6B277227DFF3319FA42" xlink:type="arc" />
    <link:label id="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3_terseLabel_en-US" xlink:label="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Severance payment for termination following a change of control</link:label>
    <link:label id="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3_label_en-US" xlink:label="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Severance Payment for Employment Termination Following Change of Control</link:label>
    <link:label id="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3_documentation_en-US" xlink:label="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of severance payment for termination of the executive's employment following a change in control under the agreement.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl" xlink:label="loc_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3" xlink:to="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl_52AFAF78746D210B3D417DFF331960E3" xlink:type="arc" />
    <link:label id="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27_terseLabel_en-US" xlink:label="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Severance payment for termination following other scenarios</link:label>
    <link:label id="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27_label_en-US" xlink:label="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Severance Payment for Employment Termination Following Other Scenarios</link:label>
    <link:label id="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27_documentation_en-US" xlink:label="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of severance payment for termination of the executive's employment following other scenarios.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios" xlink:label="loc_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27" xlink:to="lab_int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios_86A0DC05B11F2A86ED997DFF33195C27" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_AB9346D23202599D5E807DFF331AE5FC_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_AB9346D23202599D5E807DFF331AE5FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting period of outstanding equity awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_AB9346D23202599D5E807DFF331AE5FC_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_AB9346D23202599D5E807DFF331AE5FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_AB9346D23202599D5E807DFF331AE5FC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_AB9346D23202599D5E807DFF331AE5FC" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_AB9346D23202599D5E807DFF331AE5FC" xlink:type="arc" />
    <link:label id="lab_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E_terseLabel_en-US" xlink:label="lab_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period for severance payment after termination of executive's employment</link:label>
    <link:label id="lab_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E_label_en-US" xlink:label="lab_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Period for Severance Payment after Termination of Executives Employment</link:label>
    <link:label id="lab_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E_documentation_en-US" xlink:label="lab_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the period for severance payment after termination of the executive's employment under the agreement.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment" xlink:label="loc_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E" xlink:to="lab_int_LossContingencyPeriodForSeverancePaymentAfterTerminationOfExecutivesEmployment_955F3BD105C0FAA197A07DFF331A311E" xlink:type="arc" />
    <link:label id="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C_terseLabel_en-US" xlink:label="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Future minimum commitments under agreements with executive officers and key employees</link:label>
    <link:label id="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C_label_en-US" xlink:label="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Future Minimum Commitments, under Agreements with Executive Officers and Key Employees [Abstract]</link:label>
    <link:label id="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C_documentation_en-US" xlink:label="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="int-20191231.xsd#int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract" xlink:label="loc_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C" xlink:to="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract_1ECDCA932928D3F394DE7DFF331AFB7C" xlink:type="arc" />
    <link:label id="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_EDEDCA23B4C6EFB506557DFF331A3CD5_terseLabel_en-US" xlink:label="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_EDEDCA23B4C6EFB506557DFF331A3CD5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_EDEDCA23B4C6EFB506557DFF331A3CD5_label_en-US" xlink:label="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_EDEDCA23B4C6EFB506557DFF331A3CD5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Future Minimum Commitments under Agreements with Executive Officers and Key Employees Year One</link:label>
    <link:label id="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_EDEDCA23B4C6EFB506557DFF331A3CD5_documentation_en-US" xlink:label="lab_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_EDEDCA23B4C6EFB506557DFF331A3CD5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of commitment expense expected to be paid during year one of the five succeeding fiscal years.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne" xlink:label="loc_int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne_EDEDCA23B4C6EFB506557DFF331A3CD5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LeasesAbstract_857CC6083A1E345E63055E1E48D8CD5C_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_857CC6083A1E345E63055E1E48D8CD5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases [Abstract]</link:label>
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    <link:label id="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_F7E4574092E9295EB1C089B96216CA28_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_F7E4574092E9295EB1C089B96216CA28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining shares of common stock available for future issuance (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_F7E4574092E9295EB1C089B96216CA28_label_en-US" xlink:label="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_F7E4574092E9295EB1C089B96216CA28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Capital Shares Reserved for Future Issuance</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_3EFC15B78C16C6E82F0389B96376F550_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_3EFC15B78C16C6E82F0389B96376F550" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property and Equipment</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_3EFC15B78C16C6E82F0389B96376F550_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_3EFC15B78C16C6E82F0389B96376F550" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_3EFC15B78C16C6E82F0389B96376F550" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DisaggregationOfRevenueTable_C05A836226DD8C1EBBA06083DA46BCFC_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTable_C05A836226DD8C1EBBA06083DA46BCFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_C05A836226DD8C1EBBA06083DA46BCFC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_1F1B844A6D857F954BF96083DA46EBFE_terseLabel_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_1F1B844A6D857F954BF96083DA46EBFE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segments [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_1F1B844A6D857F954BF96083DA46EBFE_label_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_1F1B844A6D857F954BF96083DA46EBFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segments [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1F1B844A6D857F954BF96083DA46EBFE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SegmentDomain_15B1B47D84C4E37A9FAB6083DA46031B_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_15B1B47D84C4E37A9FAB6083DA46031B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segments [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_15B1B47D84C4E37A9FAB6083DA46031B" xlink:type="locator" />
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    <link:label id="lab_int_AviationSegmentMember_8FFCF4720C4C5062F0D56083DA46C3E9_documentation_en-US" xlink:label="lab_int_AviationSegmentMember_8FFCF4720C4C5062F0D56083DA46C3E9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information related to the Aviation segment.</link:label>
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    <link:label id="lab_us-gaap_OperatingLeaseCost_C24B0E6AE5399ED9063281EBC6103857_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_C24B0E6AE5399ED9063281EBC6103857" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_C24B0E6AE5399ED9063281EBC6103857" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseCost_C24B0E6AE5399ED9063281EBC6103857" xlink:to="lab_us-gaap_OperatingLeaseCost_C24B0E6AE5399ED9063281EBC6103857" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShortTermLeaseCost_2FD46FE241656DD8AB6781EBC610C9A7_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_2FD46FE241656DD8AB6781EBC610C9A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short-term lease cost</link:label>
    <link:label id="lab_us-gaap_ShortTermLeaseCost_2FD46FE241656DD8AB6781EBC610C9A7_label_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_2FD46FE241656DD8AB6781EBC610C9A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Short-term Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_2FD46FE241656DD8AB6781EBC610C9A7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_VariableLeaseCost_4083ABD6E94CA1744BF981EBC6105861_terseLabel_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_4083ABD6E94CA1744BF981EBC6105861" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable lease cost</link:label>
    <link:label id="lab_us-gaap_VariableLeaseCost_4083ABD6E94CA1744BF981EBC6105861_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_4083ABD6E94CA1744BF981EBC6105861" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Lease, Cost</link:label>
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    <link:label id="lab_us-gaap_SubleaseIncome_99A67E0428BB9A5D572681EBC610C067_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SubleaseIncome_99A67E0428BB9A5D572681EBC610C067" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Sublease income</link:label>
    <link:label id="lab_us-gaap_SubleaseIncome_99A67E0428BB9A5D572681EBC610C067_label_en-US" xlink:label="lab_us-gaap_SubleaseIncome_99A67E0428BB9A5D572681EBC610C067" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sublease Income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_99A67E0428BB9A5D572681EBC610C067" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubleaseIncome_99A67E0428BB9A5D572681EBC610C067" xlink:to="lab_us-gaap_SubleaseIncome_99A67E0428BB9A5D572681EBC610C067" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCost_D23D28D787DAFA2D88E581EBC610F605_totalLabel_en-US" xlink:label="lab_us-gaap_LeaseCost_D23D28D787DAFA2D88E581EBC610F605" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease cost</link:label>
    <link:label id="lab_us-gaap_LeaseCost_D23D28D787DAFA2D88E581EBC610F605_label_en-US" xlink:label="lab_us-gaap_LeaseCost_D23D28D787DAFA2D88E581EBC610F605" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_D23D28D787DAFA2D88E581EBC610F605" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCost_D23D28D787DAFA2D88E581EBC610F605" xlink:to="lab_us-gaap_LeaseCost_D23D28D787DAFA2D88E581EBC610F605" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesRentExpenseNet_5AC3C3B3742A104F3C8081EBC61180D8_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesRentExpenseNet_5AC3C3B3742A104F3C8081EBC61180D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rental expenses for properties and equipment</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesRentExpenseNet_5AC3C3B3742A104F3C8081EBC61180D8_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesRentExpenseNet_5AC3C3B3742A104F3C8081EBC61180D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesRentExpenseNet" xlink:label="loc_us-gaap_OperatingLeasesRentExpenseNet_5AC3C3B3742A104F3C8081EBC61180D8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_5535D483E216C1860E2486F69FECABC3_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_5535D483E216C1860E2486F69FECABC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_5535D483E216C1860E2486F69FECABC3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsAbstract_86F2E082068C3E0C38DE86F69FEC1F1C_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_86F2E082068C3E0C38DE86F69FEC1F1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets:</link:label>
    <link:label id="lab_us-gaap_AssetsAbstract_86F2E082068C3E0C38DE86F69FEC1F1C_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_86F2E082068C3E0C38DE86F69FEC1F1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_86F2E082068C3E0C38DE86F69FEC1F1C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsCurrentAbstract_1EAAA7026FCE2576EACB86F69FEC4D19_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_1EAAA7026FCE2576EACB86F69FEC4D19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current assets:</link:label>
    <link:label id="lab_us-gaap_AssetsCurrentAbstract_1EAAA7026FCE2576EACB86F69FEC4D19_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_1EAAA7026FCE2576EACB86F69FEC4D19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_1EAAA7026FCE2576EACB86F69FEC4D19" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E89984744683146C27A186F69FEC81AD_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E89984744683146C27A186F69FEC81AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E89984744683146C27A186F69FEC81AD_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E89984744683146C27A186F69FEC81AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E89984744683146C27A186F69FEC81AD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_E6D108E6D1F060E8DFD386F69FECD747_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_E6D108E6D1F060E8DFD386F69FECD747" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_E6D108E6D1F060E8DFD386F69FECD747" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InventoryNet_318E1C45D8F29A10A9BE86F69FEC4A36_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_318E1C45D8F29A10A9BE86F69FEC4A36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories</link:label>
    <link:label id="lab_us-gaap_InventoryNet_318E1C45D8F29A10A9BE86F69FEC4A36_label_en-US" xlink:label="lab_us-gaap_InventoryNet_318E1C45D8F29A10A9BE86F69FEC4A36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_318E1C45D8F29A10A9BE86F69FEC4A36" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PrepaidExpenseCurrent_65BFD444A6B170D98C7F86F69FEC46EF_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_65BFD444A6B170D98C7F86F69FEC46EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses</link:label>
    <link:label id="lab_us-gaap_PrepaidExpenseCurrent_65BFD444A6B170D98C7F86F69FEC46EF_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseCurrent_65BFD444A6B170D98C7F86F69FEC46EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_65BFD444A6B170D98C7F86F69FEC46EF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetsCurrent_77B31D47D25106C623D286F69FEC31D3_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetsCurrent_77B31D47D25106C623D286F69FEC31D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Current</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireProductiveAssets_DE758CC01DBB97B5A2828C4F9FB93C1F_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireProductiveAssets_DE758CC01DBB97B5A2828C4F9FB93C1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total capital expenditures</link:label>
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    <link:label id="lab_us-gaap_SegmentReportingInformationLineItems_0DD2BE1796B56E0165C56083DA6698AC_verboseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems_0DD2BE1796B56E0165C56083DA6698AC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net and total assets by segment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_0DD2BE1796B56E0165C56083DA6698AC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccountsReceivableNetAbstract_9C41BF715BE10ECF5E1D6083DA669DF8_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetAbstract_9C41BF715BE10ECF5E1D6083DA669DF8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net:</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableNetAbstract_9C41BF715BE10ECF5E1D6083DA669DF8_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetAbstract_9C41BF715BE10ECF5E1D6083DA669DF8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, after Allowance for Credit Loss [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_2E270D7DB4CAC4B1D6A56083DA67F401_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_2E270D7DB4CAC4B1D6A56083DA67F401" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowance for bad debt</link:label>
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    <link:label id="lab_us-gaap_AssetsAbstract_47DF74E903BBE9FF27776083DA67F93B_verboseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_47DF74E903BBE9FF27776083DA67F93B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total assets:</link:label>
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    <link:label id="lab_us-gaap_Assets_BD24D3DD4F37CC0F7C366083DA67C1EC_terseLabel_en-US" xlink:label="lab_us-gaap_Assets_BD24D3DD4F37CC0F7C366083DA67C1EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_BD24D3DD4F37CC0F7C366083DA67C1EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets_BD24D3DD4F37CC0F7C366083DA67C1EC" xlink:to="lab_us-gaap_Assets_BD24D3DD4F37CC0F7C366083DA67C1EC" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_2AF3AA7E7576F1F35C466083DB049BCC_verboseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_2AF3AA7E7576F1F35C466083DB049BCC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total unrecognized compensatoin cost related to unvested share-based payment awards</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_2AF3AA7E7576F1F35C466083DB049BCC_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_2AF3AA7E7576F1F35C466083DB049BCC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_2AF3AA7E7576F1F35C466083DB049BCC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_DB280C09A7AF67D1CA2C6083DB045D92_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_DB280C09A7AF67D1CA2C6083DB045D92" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period for recognition of unrecognized compensation cost related to unvested share-based payment awards</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_DB280C09A7AF67D1CA2C6083DB045D92_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_DB280C09A7AF67D1CA2C6083DB045D92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_DB280C09A7AF67D1CA2C6083DB045D92" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_DB280C09A7AF67D1CA2C6083DB045D92" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_DB280C09A7AF67D1CA2C6083DB045D92" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract_A3EA67EF1971D8A4FC756083DB053A78_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract_A3EA67EF1971D8A4FC756083DB053A78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Year Ended December 31,</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract_A3EA67EF1971D8A4FC756083DB053A78_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract_A3EA67EF1971D8A4FC756083DB053A78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract_A3EA67EF1971D8A4FC756083DB053A78" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract_A3EA67EF1971D8A4FC756083DB053A78" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedAbstract_A3EA67EF1971D8A4FC756083DB053A78" xlink:type="arc" />
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D_terseLabel_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D_label_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share Based Compensation Nonvested Awards Compensation Cost to be Recognized in Year One</link:label>
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D_documentation_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unrecognized compensation cost expected to be recognized in year one of the five succeeding years.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne" xlink:label="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D" xlink:to="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_1B0F79C51E498F165C8A6083DB05970D" xlink:type="arc" />
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E_terseLabel_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E_label_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share Based Compensation Nonvested Awards Compensation Cost to be Recognized in Year Two</link:label>
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E_documentation_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unrecognized compensation cost expected to be recognized in year two of the five succeeding years.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo" xlink:label="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E" xlink:to="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_5694B1569178825C97696083DB05450E" xlink:type="arc" />
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531_terseLabel_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531_label_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share Based Compensation Nonvested Awards Compensation Cost to be Recognized in Year Three</link:label>
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531_documentation_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unrecognized compensation cost expected to be recognized in year three of the five succeeding years.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree" xlink:label="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531" xlink:to="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_D24B174FD72690683D526083DB051531" xlink:type="arc" />
    <link:label id="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearFour_5C357CE10C41E34C31126083DB05C3CF_terseLabel_en-US" xlink:label="lab_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearFour_5C357CE10C41E34C31126083DB05C3CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_B15642A86E762E5956308C469CEBE4F5" xlink:to="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_B15642A86E762E5956308C469CEBE4F5" xlink:type="arc" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_E9EA1AE0C497391B2DFD6931DA55575A_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_E9EA1AE0C497391B2DFD6931DA55575A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_E9EA1AE0C497391B2DFD6931DA55575A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_E9EA1AE0C497391B2DFD6931DA55575A" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_E9EA1AE0C497391B2DFD6931DA55575A" xlink:type="arc" />
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    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_027E3C98C6B4998F7C766931DA5600F4_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_027E3C98C6B4998F7C766931DA5600F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_027E3C98C6B4998F7C766931DA5600F4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_D5874215196E466B03166931DA56C8B2_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_D5874215196E466B03166931DA56C8B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for bad debt</link:label>
    <link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_D5874215196E466B03166931DA56C8B2_label_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_D5874215196E466B03166931DA56C8B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Credit Loss Expense (Reversal)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_D5874215196E466B03166931DA56C8B2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensation_81D338372A9C5BCFE7636931DA56337C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_81D338372A9C5BCFE7636931DA56337C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based payment award compensation costs</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_81D338372A9C5BCFE7636931DA56337C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_81D338372A9C5BCFE7636931DA56337C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Payment Arrangement, Noncash Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_81D338372A9C5BCFE7636931DA56337C" xlink:type="locator" />
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    <link:label id="lab_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_F3E6011348793424D9F16931DA563929_terseLabel_en-US" xlink:label="lab_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_F3E6011348793424D9F16931DA563929" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income tax expense (benefit)</link:label>
    <link:label id="lab_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_F3E6011348793424D9F16931DA563929_label_en-US" xlink:label="lab_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_F3E6011348793424D9F16931DA563929" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit), Excluding Valuation Allowance Deferred Tax Asset Change In Amount</link:label>
    <link:label id="lab_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_F3E6011348793424D9F16931DA563929_documentation_en-US" xlink:label="lab_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_F3E6011348793424D9F16931DA563929" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit), Excluding Valuation Allowance Deferred Tax Asset Change In Amount</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount" xlink:label="loc_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_F3E6011348793424D9F16931DA563929" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetImpairmentCharges_2DED1232F312845ADB3A6931DA578D1F_verboseLabel_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_2DED1232F312845ADB3A6931DA578D1F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Goodwill and other impairments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_2DED1232F312845ADB3A6931DA578D1F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetImpairmentCharges_2DED1232F312845ADB3A6931DA578D1F" xlink:to="lab_us-gaap_AssetImpairmentCharges_2DED1232F312845ADB3A6931DA578D1F" xlink:type="arc" />
    <link:label id="lab_int_RestructuringChargesWriteDownOfReceivables_A986D2E7E9A4ECE088036931DA5727A0_terseLabel_en-US" xlink:label="lab_int_RestructuringChargesWriteDownOfReceivables_A986D2E7E9A4ECE088036931DA5727A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restructuring charges</link:label>
    <link:label id="lab_int_RestructuringChargesWriteDownOfReceivables_A986D2E7E9A4ECE088036931DA5727A0_label_en-US" xlink:label="lab_int_RestructuringChargesWriteDownOfReceivables_A986D2E7E9A4ECE088036931DA5727A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring Charges, Write-Down Of Receivables</link:label>
    <link:label id="lab_int_RestructuringChargesWriteDownOfReceivables_A986D2E7E9A4ECE088036931DA5727A0_documentation_en-US" xlink:label="lab_int_RestructuringChargesWriteDownOfReceivables_A986D2E7E9A4ECE088036931DA5727A0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Restructuring Charges, Write-Down Of Receivables</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_RestructuringChargesWriteDownOfReceivables" xlink:label="loc_int_RestructuringChargesWriteDownOfReceivables_A986D2E7E9A4ECE088036931DA5727A0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_EDB6FEB96FB8AE73BF526931DA578E19_negatedLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_EDB6FEB96FB8AE73BF526931DA578E19" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Foreign currency (gains) losses, net</link:label>
    <link:label id="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_EDB6FEB96FB8AE73BF526931DA578E19_label_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_EDB6FEB96FB8AE73BF526931DA578E19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign Currency Transaction Gain (Loss), Unrealized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_EDB6FEB96FB8AE73BF526931DA578E19" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GainLossOnSaleOfBusiness_1E1FB67478C9388BF5996931DA572CC4_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfBusiness_1E1FB67478C9388BF5996931DA572CC4" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">(Gain) loss on sale of business</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfBusiness_1E1FB67478C9388BF5996931DA572CC4_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfBusiness_1E1FB67478C9388BF5996931DA572CC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Disposition of Business</link:label>
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_5721D5B38D2BDFBCE8506931DA5767C4_negatedLabel_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_5721D5B38D2BDFBCE8506931DA5767C4" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_5721D5B38D2BDFBCE8506931DA5767C4_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_5721D5B38D2BDFBCE8506931DA5767C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income (Expense)</link:label>
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    <link:label id="lab_int_IncreaseDecreaseInContractWithCustomerRefundLiability_A76C78C81E6AA842754C6931DA59A52B_terseLabel_en-US" xlink:label="lab_int_IncreaseDecreaseInContractWithCustomerRefundLiability_A76C78C81E6AA842754C6931DA59A52B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer deposits</link:label>
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    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_19FC24BCD728BCCA66D5608F38165CEC_label_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_19FC24BCD728BCCA66D5608F38165CEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Weighted-Average Exercise Price [Roll Forward]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_19FC24BCD728BCCA66D5608F38165CEC" xlink:to="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_19FC24BCD728BCCA66D5608F38165CEC" xlink:type="arc" />
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8_periodStartLabel_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at the beginning of the period (in dollars per share)</link:label>
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8_label_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Outstanding Weighted Average Exercise Price</link:label>
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8_documentation_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Weighted average price of nonvested awards on equity-based plans excluding option plans at which grantees can acquire the award under the plan.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8" xlink:to="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_D5C8D1D2967CAF95E190608C2995AFB8" xlink:type="arc" />
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice_7B54DB10ED332CD99035608A7E36FC09_terseLabel_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice_7B54DB10ED332CD99035608A7E36FC09" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted (in dollars per share)</link:label>
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    <link:loc xlink:href="int-20191231.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice_7B54DB10ED332CD99035608A7E36FC09" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice_7B54DB10ED332CD99035608A7E36FC09" xlink:to="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice_7B54DB10ED332CD99035608A7E36FC09" xlink:type="arc" />
    <link:label id="lab_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C_terseLabel_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercised (in dollars per share)</link:label>
    <link:label id="lab_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C_label_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement by Share Based Payment Award, Non-Option Equity Instruments, Exercises in Period, Weighted Average Exercise Price</link:label>
    <link:label id="lab_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C_documentation_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The weighted average price at which equity-based payment instruments, excluding stock (or unit) options, are exercised during the reporting period.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C" xlink:to="lab_int_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesinPeriodWeightedAverageExercisePrice_5ED323F3D8BD962F3EF76083DB11F74C" xlink:type="arc" />
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D_terseLabel_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forfeited (in dollars per share)</link:label>
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D_label_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options Forfeited in Period, Weighted Average Exercise Price</link:label>
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D_documentation_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The weighted average price of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D" xlink:to="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice_7CB19225040BEC9466DE608C293EEA6D" xlink:type="arc" />
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_AE4AF5E3B878F20DC20B608C6B929306_periodEndLabel_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_AE4AF5E3B878F20DC20B608C6B929306" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at the end of the period (in dollars per share)</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_AE4AF5E3B878F20DC20B608C6B929306" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_AE4AF5E3B878F20DC20B608C6B929306" xlink:to="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_AE4AF5E3B878F20DC20B608C6B929306" xlink:type="arc" />
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_7B0D9C2495ACFD5B58916083DB116005_terseLabel_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_7B0D9C2495ACFD5B58916083DB116005" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SSAR Awards Exercisable</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_7B0D9C2495ACFD5B58916083DB116005" xlink:to="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableAbstract_7B0D9C2495ACFD5B58916083DB116005" xlink:type="arc" />
    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber_B5166867C1722FDD334E6083DB12CFCE_terseLabel_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableNumber_B5166867C1722FDD334E6083DB12CFCE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SSAR Awards (in shares)</link:label>
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    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice_855E329FCF4B6C014EFD6083DB129095_terseLabel_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice_855E329FCF4B6C014EFD6083DB129095" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price (in dollars per share)</link:label>
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    <link:label id="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice_855E329FCF4B6C014EFD6083DB129095_documentation_en-US" xlink:label="lab_int_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisableWeightedAverageExercisePrice_855E329FCF4B6C014EFD6083DB129095" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of equity-based payment instruments, excluding stock (or unit) options, outstanding and currently exercisable under the plan.</link:label>
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    <link:label id="lab_int_SalesCommitmentsUnderDerivativeProgramAmount_713D8A9FEDFEFF2208B9604A66370905_terseLabel_en-US" xlink:label="lab_int_SalesCommitmentsUnderDerivativeProgramAmount_713D8A9FEDFEFF2208B9604A66370905" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sales commitments under derivative programs</link:label>
    <link:label id="lab_int_SalesCommitmentsUnderDerivativeProgramAmount_713D8A9FEDFEFF2208B9604A66370905_label_en-US" xlink:label="lab_int_SalesCommitmentsUnderDerivativeProgramAmount_713D8A9FEDFEFF2208B9604A66370905" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales Commitments under Derivative Program Amount</link:label>
    <link:label id="lab_int_SalesCommitmentsUnderDerivativeProgramAmount_713D8A9FEDFEFF2208B9604A66370905_documentation_en-US" xlink:label="lab_int_SalesCommitmentsUnderDerivativeProgramAmount_713D8A9FEDFEFF2208B9604A66370905" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the sales commitment as of the balance sheet date under derivative programs.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_SalesCommitmentsUnderDerivativeProgramAmount" xlink:label="loc_int_SalesCommitmentsUnderDerivativeProgramAmount_713D8A9FEDFEFF2208B9604A66370905" xlink:type="locator" />
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    <link:label id="lab_int_PurchaseCommitmentsUnderDerivativeProgramAmount_BB2487A2E5AF19CB76A7604A663CDA02_terseLabel_en-US" xlink:label="lab_int_PurchaseCommitmentsUnderDerivativeProgramAmount_BB2487A2E5AF19CB76A7604A663CDA02" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase commitments under derivative programs</link:label>
    <link:label id="lab_int_PurchaseCommitmentsUnderDerivativeProgramAmount_BB2487A2E5AF19CB76A7604A663CDA02_label_en-US" xlink:label="lab_int_PurchaseCommitmentsUnderDerivativeProgramAmount_BB2487A2E5AF19CB76A7604A663CDA02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Commitments under Derivative Program Amount</link:label>
    <link:label id="lab_int_PurchaseCommitmentsUnderDerivativeProgramAmount_BB2487A2E5AF19CB76A7604A663CDA02_documentation_en-US" xlink:label="lab_int_PurchaseCommitmentsUnderDerivativeProgramAmount_BB2487A2E5AF19CB76A7604A663CDA02" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the purchase commitment as of the balance sheet date under derivative programs.</link:label>
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    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentTable_D78A228C683341609F27604A66438827_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentTable_D78A228C683341609F27604A66438827" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Purchase Commitment [Table]</link:label>
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentTable_D78A228C683341609F27604A66438827_label_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentTable_D78A228C683341609F27604A66438827" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Purchase Commitment [Table]</link:label>
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    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_4BA11E5A8E4A336BF033604A66441C18_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_4BA11E5A8E4A336BF033604A66441C18" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Category of Item Purchased [Axis]</link:label>
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_4BA11E5A8E4A336BF033604A66441C18_label_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_4BA11E5A8E4A336BF033604A66441C18" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Category of Item Purchased [Axis]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_4BA11E5A8E4A336BF033604A66441C18" xlink:to="lab_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_4BA11E5A8E4A336BF033604A66441C18" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_D4699A802B0C2DA48CDA604A66441DDA_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_D4699A802B0C2DA48CDA604A66441DDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Purchase Commitment, Category of Item Purchased [Domain]</link:label>
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_D4699A802B0C2DA48CDA604A66441DDA_label_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_D4699A802B0C2DA48CDA604A66441DDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Purchase Commitment, Category of Item Purchased [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_D4699A802B0C2DA48CDA604A66441DDA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_D4699A802B0C2DA48CDA604A66441DDA" xlink:to="lab_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_D4699A802B0C2DA48CDA604A66441DDA" xlink:type="arc" />
    <link:label id="lab_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81_terseLabel_en-US" xlink:label="lab_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aviation Fuel</link:label>
    <link:label id="lab_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81_label_en-US" xlink:label="lab_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aviation Fuel [Member]</link:label>
    <link:label id="lab_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81_documentation_en-US" xlink:label="lab_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Aviation Fuel [Member]</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_AviationFuelMember" xlink:label="loc_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81" xlink:to="lab_int_AviationFuelMember_2002EE7267B8BA7DA16E604A66452E81" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentLineItems_40A40492EDBA27EBDF86604A6645868D_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentLineItems_40A40492EDBA27EBDF86604A6645868D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Purchase Commitment [Line Items]</link:label>
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentLineItems_40A40492EDBA27EBDF86604A6645868D_label_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentLineItems_40A40492EDBA27EBDF86604A6645868D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Purchase Commitment [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentLineItems" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentLineItems_40A40492EDBA27EBDF86604A6645868D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_40A40492EDBA27EBDF86604A6645868D" xlink:to="lab_us-gaap_LongTermPurchaseCommitmentLineItems_40A40492EDBA27EBDF86604A6645868D" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_541FE961C9933D007397604A6645C8C8_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_541FE961C9933D007397604A6645C8C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum purchase required (in barrels)</link:label>
    <link:label id="lab_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_541FE961C9933D007397604A6645C8C8_label_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_541FE961C9933D007397604A6645C8C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Purchase Commitment, Minimum Volume Required</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_541FE961C9933D007397604A6645C8C8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_541FE961C9933D007397604A6645C8C8" xlink:to="lab_us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired_541FE961C9933D007397604A6645C8C8" xlink:type="arc" />
    <link:label id="lab_us-gaap_QuarterlyFinancialInformationTextBlock_EAFBA2EEFD68F7C621DF89B9638A64CC_terseLabel_en-US" xlink:label="lab_us-gaap_QuarterlyFinancialInformationTextBlock_EAFBA2EEFD68F7C621DF89B9638A64CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary Quarterly Information (Unaudited)</link:label>
    <link:label id="lab_us-gaap_QuarterlyFinancialInformationTextBlock_EAFBA2EEFD68F7C621DF89B9638A64CC_label_en-US" xlink:label="lab_us-gaap_QuarterlyFinancialInformationTextBlock_EAFBA2EEFD68F7C621DF89B9638A64CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Quarterly Financial Information [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_QuarterlyFinancialInformationTextBlock" xlink:label="loc_us-gaap_QuarterlyFinancialInformationTextBlock_EAFBA2EEFD68F7C621DF89B9638A64CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_QuarterlyFinancialInformationTextBlock_EAFBA2EEFD68F7C621DF89B9638A64CC" xlink:to="lab_us-gaap_QuarterlyFinancialInformationTextBlock_EAFBA2EEFD68F7C621DF89B9638A64CC" xlink:type="arc" />
    <link:label id="lab_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3_terseLabel_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in additional liabilities related to unrecognized tax liabilities</link:label>
    <link:label id="lab_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3_label_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Liabilities, Period Increase (Decrease)</link:label>
    <link:label id="lab_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3_documentation_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net amount of all increases and decreases in unrecognized tax liabilities for the period.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease" xlink:label="loc_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3" xlink:to="lab_int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease_94988074032FD4F666BF86F33F7BD2A3" xlink:type="arc" />
    <link:label id="lab_int_UnrecognizedTaxAssetsPeriodIncreaseDecrease_BB4051EEC4FED6DFFD6C86F33F7FF828_terseLabel_en-US" xlink:label="lab_int_UnrecognizedTaxAssetsPeriodIncreaseDecrease_BB4051EEC4FED6DFFD6C86F33F7FF828" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in assets related to unrecognized tax assets</link:label>
    <link:label id="lab_int_UnrecognizedTaxAssetsPeriodIncreaseDecrease_BB4051EEC4FED6DFFD6C86F33F7FF828_label_en-US" xlink:label="lab_int_UnrecognizedTaxAssetsPeriodIncreaseDecrease_BB4051EEC4FED6DFFD6C86F33F7FF828" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Assets, Period Increase (Decrease)</link:label>
    <link:label id="lab_int_UnrecognizedTaxAssetsPeriodIncreaseDecrease_BB4051EEC4FED6DFFD6C86F33F7FF828_documentation_en-US" xlink:label="lab_int_UnrecognizedTaxAssetsPeriodIncreaseDecrease_BB4051EEC4FED6DFFD6C86F33F7FF828" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net amount of all increases and decreases in unrecognized tax assets for the period.</link:label>
    <link:loc xlink:href="int-20191231.xsd#int_UnrecognizedTaxAssetsPeriodIncreaseDecrease" xlink:label="loc_int_UnrecognizedTaxAssetsPeriodIncreaseDecrease_BB4051EEC4FED6DFFD6C86F33F7FF828" xlink:type="locator" />
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    <link:label id="lab_int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease_D57D9C04990C74D7DEC486F33F7F47FF_terseLabel_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease_D57D9C04990C74D7DEC486F33F7F47FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in unrecognized tax liabilities related to a foreign currency translation expense</link:label>
    <link:label id="lab_int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease_D57D9C04990C74D7DEC486F33F7F47FF_label_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease_D57D9C04990C74D7DEC486F33F7F47FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Liabilities, Related to Foreign Currency Translation, Expense Period Increase (Decrease)</link:label>
    <link:label id="lab_int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease_D57D9C04990C74D7DEC486F33F7F47FF_documentation_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease_D57D9C04990C74D7DEC486F33F7F47FF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net amount of all increases and decreases in unrecognized tax liabilities related to a foreign currency translation expense for the period.</link:label>
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    <link:label id="lab_int_UnrecognizedTaxLiabilities_0408336A934506675D4586F33F7F5B57_terseLabel_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilities_0408336A934506675D4586F33F7F5B57" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized tax liabilities</link:label>
    <link:label id="lab_int_UnrecognizedTaxLiabilities_0408336A934506675D4586F33F7F5B57_label_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilities_0408336A934506675D4586F33F7F5B57" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Liabilities</link:label>
    <link:label id="lab_int_UnrecognizedTaxLiabilities_0408336A934506675D4586F33F7F5B57_documentation_en-US" xlink:label="lab_int_UnrecognizedTaxLiabilities_0408336A934506675D4586F33F7F5B57" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The gross amount of unrecognized tax liabilities for unrecognized tax benefits as of the balance sheet date.</link:label>
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