XML 91 R73.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Income Taxes - Narrative (Details) ₩ in Millions, kr in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Jan. 01, 2018 | Aug. 31, 2021 USD ($) | Aug. 31, 2021 KRW (₩) | May 31, 2021 USD ($) | May 31, 2021 KRW (₩) | Apr. 30, 2021 USD ($) | Apr. 30, 2021 DKK (kr) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 DKK (kr) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 KRW (₩)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  |  |  |  |  | 25.80% | 25.80% | 32.20% | 23.70% | 30.20% |  |
Provision for income taxes |  |  |  |  |  |  |  |  | $ 25.8 |  | $ 52.1 | $ 56.2 | $ 55.9 |  |
Provisional undistributed accumulated earnings of foreign subsidiary |  |  |  |  |  |  |  |  | 976.5 |  |  |  |  |  |
Foreign withholding tax, if undistributed earnings are no reinvested indefinitely |  |  |  |  |  |  |  |  | 214.8 |  |  |  |  |  |
Accumulated foreign earnings deemed repatriated |  |  |  |  |  |  |  |  | 1,500.0 |  |  |  |  |  |
Provisional estimate of the associated foreign withholding and state income tax effects |  |  |  |  |  |  |  |  | 10.6 |  |  |  |  |  |
Net operating losses |  |  |  |  |  |  |  |  | 402.5 |  | 418.2 |  |  |  |
Deferred tax asset |  |  |  |  |  |  |  |  | 45.9 |  | 57.4 |  |  |  |
Valuation allowance |  |  |  |  |  |  |  |  | 39.7 |  | 48.0 |  |  |  |
Valuation allowance, deferred tax asset for NOLs |  |  |  |  |  |  |  |  | 35.7 |  |  |  |  |  |
Increase (decrease) in additional liabilities related to unrecognized tax liabilities |  |  |  |  |  |  |  |  | (3.1) |  | 12.2 |  |  |  |
Increase (decrease) in unrecognized tax liabilities related to a foreign currency translation expense |  |  |  |  |  |  |  |  | (1.6) |  |  |  |  |  |
Increase (decrease) in addition unrecognized tax liabilities related to a foreign currency translation expense |  |  |  |  |  |  |  |  | (3.8) |  | 4.0 |  |  |  |
Unrecognized tax liabilities |  |  |  |  |  |  |  |  | 98.2 |  | 99.0 |  |  |  |
Unrecognized tax assets |  |  |  |  |  |  |  |  | 23.9 |  | 25.4 |  |  |  |
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor |  |  |  |  |  |  |  |  | $ 51.2 |  |  |  |  |  |
Expected reduction in effective income tax rate if uncertain tax positions are settled by the taxing authorities in the entity's favor (as a percent) |  |  |  |  |  |  |  |  | 51.20% | 51.20% |  |  |  |  |
Amount of unrecognized income tax liabilities may decrease within the next twelve months |  |  |  |  |  |  |  |  | $ 4.2 |  |  |  |  |  |
Interest related to unrecognized tax benefits, recorded as expense |  |  |  |  |  |  |  |  | 2.6 |  | 3.1 | 4.6 |  |  |
Penalties related to unrecognized tax benefits, recorded as income tax expense (income) |  |  |  |  |  |  |  |  | (0.3) |  | 0.2 | $ (0.2) |  |  |
Accrued interest related to unrecognized tax benefits |  |  |  |  |  |  |  |  | 18.8 |  | 16.2 |  |  |  |
Accrued penalties related to unrecognized tax benefits |  |  |  |  |  |  |  |  | 4.3 |  | $ 4.6 |  |  |  |
Inland Revenue, Singapore (IRAS) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period applicable for additional special income tax concession |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Tax Authority | Danish Tax Authority | Tax Year 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated tax |  |  |  |  |  |  |  |  | 0.6 | kr 3.7 |  |  |  |  |
Foreign Tax Authority | Danish Tax Authority | Tax Year 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated tax |  |  |  |  |  |  |  |  | $ 0.8 | kr 4.9 |  |  |  |  |
Foreign Tax Authority | Danish Tax Authority | Tax Year 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated tax |  |  |  |  |  |  | $ 14.7 | kr 96.1 |  |  |  |  |  |  |
Foreign Tax Authority | Tax Authority, South Korea (SRTO) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated tax |  |  | $ 9.0 | ₩ 10,600.0 | $ 9.0 | ₩ 10,600.0 |  |  |  |  |  |  |  |  |
Foreign Tax Authority | Tax Authority, South Korea (SRTO) | Tax Year 2011 To 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated tax |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.5 | ₩ 11,300.0
Disposal Group, Not Discontinued Operations | Multi Service Payment Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes | $ 12.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Income Tax Concession Period + References No definition available. + Details
Name: | int_IncomeTaxConcessionPeriod
Namespace Prefix: | int_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Undistributed Accumulated Earnings Of Foreign Subsidiary Permanently Reinvested + References No definition available. + Details
Name: | int_TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalUndistributedAccumulatedEarningsOfForeignSubsidiaryPermanentlyReinvested
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Undistributed Earnings Of Foreign Subsidiaries, Withholding Tax If Not Permanently Reinvested + References No definition available. + Details
Name: | int_TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalUndistributedEarningsOfForeignSubsidiariesWithholdingTaxIfNotPermanentlyReinvested
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Withholding And State Tax Expense (Benefit) + References No definition available. + Details
Name: | int_TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalWithholdingAndStateTaxExpenseBenefit
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The gross amount of unrecognized tax assets related to unrecognized tax benefits as of the balance sheet date. + References No definition available. + Details
Name: | int_UnrecognizedTaxAssets
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The effective income tax rate of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References No definition available. + Details
Name: | int_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRatePercentage
Namespace Prefix: | int_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gross amount of unrecognized tax liabilities for unrecognized tax benefits as of the balance sheet date. + References No definition available. + Details
Name: | int_UnrecognizedTaxLiabilities
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The net amount of all increases and decreases in unrecognized tax liabilities for the period. + References No definition available. + Details
Name: | int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unrecognized Tax Liabilities, Related to Foreign Currency Translation, Addition Expense Period Increase (Decrease) + References No definition available. + Details
Name: | int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationAdditionExpensePeriodIncreaseDecrease
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net amount of all increases and decreases in unrecognized tax liabilities related to a foreign currency translation expense for the period. + References No definition available. + Details
Name: | int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
Name: | us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
Name: | us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of foreign earnings repatriated from subsidiaries outside the country of domicile. + References No definition available. + Details
Name: | us-gaap_ForeignEarningsRepatriated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated amount of loss resulting from an adverse tax position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
Name: | us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123586238&loc=d3e38679-109324 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(9)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 + Details
Name: | us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_OperatingLossCarryforwardsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest expense for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InlandRevenueSingaporeIRASMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=int_DanishTaxAuthorityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_TaxYear2013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_TaxYear2014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_TaxYear2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=int_TaxAuthoritySouthKoreaSRTOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=int_TaxYear2011To2014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=int_MultiServicePaymentSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |