XML 67 R56.htm IDEA: XBRL DOCUMENT
v3.20.2

Commitments and Contingencies (Details) R$ in Millions, $ in Millions, ₩ in Billions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 BRL (R$) | Jun. 30, 2017 KRW (₩) | Dec. 31, 2016 KRW (₩)
Tax Authority, South Korea (SRTO) | Assessment |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Income tax assessment notice, amount | $ |  | $ 9.7 |  |  |  |
Estimate of possible loss | ₩ |  |  |  |  |  | ₩ 11.3
Tax Authority, South Korea (SRTO) | Additional Assessment |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Income tax assessment notice, amount | $ | $ 17.3 |  |  |  |  |
Estimate of possible loss | ₩ |  |  |  |  | ₩ 20.1 |
Federal, State and Municipal Tax Authorities in Brazil | Assessment |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible loss |  |  | $ 8.7 | R$ 49.1 |  |

X
- Definition The amount of estimated penalties recognized in the period arising from income tax examinations. + 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=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_IncomeTaxExaminationPenaltiesExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=int_TaxAuthorityAssessmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=int_TaxAuthorityAdditionalAssessmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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