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    <link:label id="lab_int_LandSegmentMember_D2E828A147C6279301A5F553B6ACC694_documentation_en-US" xlink:label="lab_int_LandSegmentMember_D2E828A147C6279301A5F553B6ACC694" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information related to the Land segment.</link:label>
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    <link:label id="lab_int_MarineSegmentMember_495CF87F46B838B683F5F553B6ACA03A_documentation_en-US" xlink:label="lab_int_MarineSegmentMember_495CF87F46B838B683F5F553B6ACA03A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information related to the Marine segment.</link:label>
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    <link:label id="lab_us-gaap_SegmentReportingInformationLineItems_19C8BA827FFC78A36103F553B6ACE66D_label_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems_19C8BA827FFC78A36103F553B6ACE66D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting Information [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_19C8BA827FFC78A36103F553B6ACE66D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RevenuesAbstract_9D7B3D9A718B32DC7A00F553B6ACE4CA_label_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_9D7B3D9A718B32DC7A00F553B6ACE4CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_9D7B3D9A718B32DC7A00F553B6ACE4CA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Revenues_A68EE023BD8F74469E9AF553B6ACE5FC_label_en-US" xlink:label="lab_us-gaap_Revenues_A68EE023BD8F74469E9AF553B6ACE5FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_A68EE023BD8F74469E9AF553B6ACE5FC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GrossProfitAbstract_92576A090D8A508F1ED9F553B6AC5F2B_label_en-US" xlink:label="lab_us-gaap_GrossProfitAbstract_92576A090D8A508F1ED9F553B6AC5F2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gross Profit [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GrossProfitAbstract" xlink:label="loc_us-gaap_GrossProfitAbstract_92576A090D8A508F1ED9F553B6AC5F2B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GrossProfit_A41630AD13D6F5A75070F553B6AC9EA9_terseLabel_en-US" xlink:label="lab_us-gaap_GrossProfit_A41630AD13D6F5A75070F553B6AC9EA9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross profit</link:label>
    <link:label id="lab_us-gaap_GrossProfit_A41630AD13D6F5A75070F553B6AC9EA9_label_en-US" xlink:label="lab_us-gaap_GrossProfit_A41630AD13D6F5A75070F553B6AC9EA9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gross Profit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_A41630AD13D6F5A75070F553B6AC9EA9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingIncomeLossAbstract_75A47A419BCB06C1D563F553B6AC6AD7_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLossAbstract_75A47A419BCB06C1D563F553B6AC6AD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Income (Loss) [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingIncomeLossAbstract" xlink:label="loc_us-gaap_OperatingIncomeLossAbstract_75A47A419BCB06C1D563F553B6AC6AD7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingIncomeLoss_51CE640856EEC50A3B00F553B6ACD3D4_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_51CE640856EEC50A3B00F553B6ACD3D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Income (Loss)</link:label>
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    <link:label id="lab_us-gaap_EarningsPerShareAbstract_FD374E04C9B8DBF3A0EFF553B69EE9A2_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_FD374E04C9B8DBF3A0EFF553B69EE9A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_FD374E04C9B8DBF3A0EFF553B69EE9A2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetIncomeLossAbstract_D54AFAEA7B51DFFADD17F553B69EE103_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAbstract_D54AFAEA7B51DFFADD17F553B69EE103" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent [Abstract]</link:label>
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    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_0FE3E0F1547FA0021DD8F553B6DEE70A_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_0FE3E0F1547FA0021DD8F553B6DEE70A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative liabilities</link:label>
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    <link:label id="lab_int_DerivativeAndInventoryLiabilityFairValueNet_EBCE634A72F230914A14F553B6DEEA07_totalLabel_en-US" xlink:label="lab_int_DerivativeAndInventoryLiabilityFairValueNet_EBCE634A72F230914A14F553B6DEEA07" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities at fair value</link:label>
    <link:label id="lab_int_DerivativeAndInventoryLiabilityFairValueNet_EBCE634A72F230914A14F553B6DEEA07_label_en-US" xlink:label="lab_int_DerivativeAndInventoryLiabilityFairValueNet_EBCE634A72F230914A14F553B6DEEA07" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative and Inventory Liability Fair Value Net</link:label>
    <link:label id="lab_int_DerivativeAndInventoryLiabilityFairValueNet_EBCE634A72F230914A14F553B6DEEA07_documentation_en-US" xlink:label="lab_int_DerivativeAndInventoryLiabilityFairValueNet_EBCE634A72F230914A14F553B6DEEA07" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair value, after effects of master netting arrangements, of derivative and inventory liability, net of the amount which can be net settled under a master netting arrangement and collateral.</link:label>
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    <link:label id="lab_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_4ACFC13A405605087380F553B6DEFB45_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_4ACFC13A405605087380F553B6DEFB45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfers from Level 1 to Level 2, assets</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_4ACFC13A405605087380F553B6DEFB45_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_4ACFC13A405605087380F553B6DEFB45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Assets, Level 1 to Level 2 Transfers, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount" xlink:label="loc_us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount_4ACFC13A405605087380F553B6DEFB45" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_EA2EDDC255C9CED20A49F553B6DE26F3_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_EA2EDDC255C9CED20A49F553B6DE26F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfers from Level 2 to Level 1, assets</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_EA2EDDC255C9CED20A49F553B6DE26F3_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_EA2EDDC255C9CED20A49F553B6DE26F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Assets, Level 2 to Level 1 Transfers, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount" xlink:label="loc_us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount_EA2EDDC255C9CED20A49F553B6DE26F3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_0F4D37080471A60DAADFF553B6DE1025_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_0F4D37080471A60DAADFF553B6DE1025" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfers from Level 1 to Level 2, liabilities</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_0F4D37080471A60DAADFF553B6DE1025_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_0F4D37080471A60DAADFF553B6DE1025" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount" xlink:label="loc_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_0F4D37080471A60DAADFF553B6DE1025" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_0F4D37080471A60DAADFF553B6DE1025" xlink:to="lab_us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount_0F4D37080471A60DAADFF553B6DE1025" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_FE2D3D2AD8378884B848F553B6DF420F_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_FE2D3D2AD8378884B848F553B6DF420F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfers from Level 2 to Level 1, liabilities</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_FE2D3D2AD8378884B848F553B6DF420F_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_FE2D3D2AD8378884B848F553B6DF420F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount" xlink:label="loc_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_FE2D3D2AD8378884B848F553B6DF420F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_FE2D3D2AD8378884B848F553B6DF420F" xlink:to="lab_us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount_FE2D3D2AD8378884B848F553B6DF420F" xlink:type="arc" />
    <link:label id="lab_us-gaap_SegmentReportingDisclosureTextBlock_DE7709F2DEA5748D915AF553B6B19730_verboseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingDisclosureTextBlock_DE7709F2DEA5748D915AF553B6B19730" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Business Segments</link:label>
    <link:label id="lab_us-gaap_SegmentReportingDisclosureTextBlock_DE7709F2DEA5748D915AF553B6B19730_label_en-US" xlink:label="lab_us-gaap_SegmentReportingDisclosureTextBlock_DE7709F2DEA5748D915AF553B6B19730" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="loc_us-gaap_SegmentReportingDisclosureTextBlock_DE7709F2DEA5748D915AF553B6B19730" xlink:type="locator" />
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    <link:label id="lab_int_AmendedCreditFacilityMember_2608BF334BF391F27B71F8AAB561C338_terseLabel_en-US" xlink:label="lab_int_AmendedCreditFacilityMember_2608BF334BF391F27B71F8AAB561C338" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amended Credit Facility</link:label>
    <link:label id="lab_int_AmendedCreditFacilityMember_2608BF334BF391F27B71F8AAB561C338_label_en-US" xlink:label="lab_int_AmendedCreditFacilityMember_2608BF334BF391F27B71F8AAB561C338" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amended Credit Facility [Member]</link:label>
    <link:label id="lab_int_AmendedCreditFacilityMember_2608BF334BF391F27B71F8AAB561C338_documentation_en-US" xlink:label="lab_int_AmendedCreditFacilityMember_2608BF334BF391F27B71F8AAB561C338" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amended Credit Facility [Member]</link:label>
    <link:loc xlink:href="int-20180331.xsd#int_AmendedCreditFacilityMember" xlink:label="loc_int_AmendedCreditFacilityMember_2608BF334BF391F27B71F8AAB561C338" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CreditFacilityAxis_009C2ACF5D98BCE7E3CBF8AAB561121F_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_009C2ACF5D98BCE7E3CBF8AAB561121F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:label id="lab_us-gaap_CreditFacilityAxis_009C2ACF5D98BCE7E3CBF8AAB561121F_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_009C2ACF5D98BCE7E3CBF8AAB561121F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_009C2ACF5D98BCE7E3CBF8AAB561121F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CreditFacilityDomain_6B733B4B7D144ED0AAE5F8AAB561B085_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_6B733B4B7D144ED0AAE5F8AAB561B085" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility [Domain]</link:label>
    <link:label id="lab_us-gaap_CreditFacilityDomain_6B733B4B7D144ED0AAE5F8AAB561B085_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_6B733B4B7D144ED0AAE5F8AAB561B085" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_6B733B4B7D144ED0AAE5F8AAB561B085" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityDomain_6B733B4B7D144ED0AAE5F8AAB561B085" xlink:to="lab_us-gaap_CreditFacilityDomain_6B733B4B7D144ED0AAE5F8AAB561B085" xlink:type="arc" />
    <link:label id="lab_int_LettersOfCreditAndBankersAcceptanceMember_D39407CA57237988197AF8AAB561DA47_terseLabel_en-US" xlink:label="lab_int_LettersOfCreditAndBankersAcceptanceMember_D39407CA57237988197AF8AAB561DA47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of Credit and Bankers Acceptance</link:label>
    <link:label id="lab_int_LettersOfCreditAndBankersAcceptanceMember_D39407CA57237988197AF8AAB561DA47_label_en-US" xlink:label="lab_int_LettersOfCreditAndBankersAcceptanceMember_D39407CA57237988197AF8AAB561DA47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters Of Credit And Bankers Acceptance [Member]</link:label>
    <link:label id="lab_int_LettersOfCreditAndBankersAcceptanceMember_D39407CA57237988197AF8AAB561DA47_documentation_en-US" xlink:label="lab_int_LettersOfCreditAndBankersAcceptanceMember_D39407CA57237988197AF8AAB561DA47" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Letters of Credit and Bankers Acceptance [Member]</link:label>
    <link:loc xlink:href="int-20180331.xsd#int_LettersOfCreditAndBankersAcceptanceMember" xlink:label="loc_int_LettersOfCreditAndBankersAcceptanceMember_D39407CA57237988197AF8AAB561DA47" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_DADC3C31C64ACF78DA07F8AAB56156E4_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_DADC3C31C64ACF78DA07F8AAB56156E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_DADC3C31C64ACF78DA07F8AAB56156E4_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_DADC3C31C64ACF78DA07F8AAB56156E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_DADC3C31C64ACF78DA07F8AAB56156E4" xlink:type="locator" />
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    <link:label id="lab_int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity_27845CC1B1A312053784F8AAB561F6A9_terseLabel_en-US" xlink:label="lab_int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity_27845CC1B1A312053784F8AAB561F6A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum additional borrowings available at the entity's request subject to satisfaction of certain conditions</link:label>
    <link:label id="lab_int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity_27845CC1B1A312053784F8AAB561F6A9_label_en-US" xlink:label="lab_int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity_27845CC1B1A312053784F8AAB561F6A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line Of Credit Facility, Maximum Additional Borrowing Capacity</link:label>
    <link:label id="lab_int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity_27845CC1B1A312053784F8AAB561F6A9_documentation_en-US" xlink:label="lab_int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity_27845CC1B1A312053784F8AAB561F6A9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum additional borrowing capacity available under the credit facility at the entity's request subject to satisfaction of certain conditions.</link:label>
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    <link:label id="lab_int_CostOfRevenueExcludingHedgingImpactOfHedges_4CC0A65CBB104F88026BFECD1E7282AB_terseLabel_en-US" xlink:label="lab_int_CostOfRevenueExcludingHedgingImpactOfHedges_4CC0A65CBB104F88026BFECD1E7282AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total amount of income of expense line items excluding the impact of hedges</link:label>
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    <link:label id="lab_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_CC81A896C412B7A85BF7FEABD74A1D78_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_CC81A896C412B7A85BF7FEABD74A1D78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (Loss) recognized in earnings related to fair value or cash flow hedges excluded from assessment of hedge effectiveness</link:label>
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    <link:label id="lab_int_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_9D5B8442DFE3503709EBFF4468EE152E_terseLabel_en-US" xlink:label="lab_int_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_9D5B8442DFE3503709EBFF4468EE152E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_1CA0548D27F63EF8BFB803A90F308752_totalLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_1CA0548D27F63EF8BFB803A90F308752" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total adjustments</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_DFB992ADB4D2556E538103A90F30C88E_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_DFB992ADB4D2556E538103A90F30C88E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash (used in) provided by operating activities</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_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_DFB992ADB4D2556E538103A90F30C88E" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_DFB992ADB4D2556E538103A90F30C88E" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_85A644BC427C9FBD900D03A90F30BCBA" xlink:type="locator" />
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