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Business Segments (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts receivable, net:
Accounts receivable, net	$ 2,202.3us-gaap_AccountsReceivableNetCurrent	$ 2,307.9us-gaap_AccountsReceivableNetCurrent
Total assets:
Total assets	4,788.0us-gaap_Assets	4,880.0us-gaap_Assets
Aviation Segment
Accounts receivable, net:
Accounts receivable, net	653.2us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember	686.5us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Allowance for bad debt	7.2us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember	7.9us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Marine segment
Accounts receivable, net:
Accounts receivable, net	870.6us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember	974.0us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Allowance for bad debt	8.4us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember	8.4us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Land Segment
Accounts receivable, net:
Accounts receivable, net	678.5us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember	647.4us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Allowance for bad debt	9.7us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember	9.4us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Operating Segments | Aviation Segment
Total assets:
Total assets	1,656.3us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember	1,635.4us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Operating Segments | Marine segment
Total assets:
Total assets	1,349.1us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember	1,483.1us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Operating Segments | Land Segment
Total assets:
Total assets	1,570.7us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember	1,570.6us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Corporate
Total assets:
Total assets	$ 211.9us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	$ 190.9us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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