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

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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