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v3.20.4

Commitments and Contingencies - Bonds, Leases, and Sales and Purchase Commitments (Details) bbl in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) bbl | Dec. 31, 2019 USD ($)
Long-term Purchase Commitment [Line Items] |  |
Outstanding bonds | $ 50.6 | $ 53.1
Sales commitments under derivative programs | 374.8 |
Purchase commitments under derivative programs | $ 88.4 |
Aviation Fuel | Minimum |  |
Long-term Purchase Commitment [Line Items] |  |
Minimum purchase required (in barrels) | bbl | 1,830 |
Aviation Fuel | Maximum |  |
Long-term Purchase Commitment [Line Items] |  |
Minimum purchase required (in barrels) | bbl | 2,020 |

X
- Definition Represents the purchase commitment as of the balance sheet date under derivative programs. + References No definition available. + Details
Name: | int_PurchaseCommitmentsUnderDerivativeProgramAmount
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the sales commitment as of the balance sheet date under derivative programs. + References No definition available. + Details
Name: | int_SalesCommitmentsUnderDerivativeProgramAmount
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the surety bonds, arranged to satisfy various security requirements, outstanding as of the balance sheet date. + References No definition available. + Details
Name: | int_SuretyBondsOutstanding
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Volume that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=int_AviationFuelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |