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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: