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v2.4.1.9

Debt (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Jan. 30, 2015 | Jan. 29, 2015 | Dec. 31, 2013
Credit facility |  |  |  |
Debt |  |  |  |
Maximum borrowing capacity |  | $ 1,260.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember | $ 1,100.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
Amount outstanding | 420.0 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  | 200.0 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
Maximum additional borrowings available at the entity's request subject to satisfaction of certain conditions | 150.0 int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Unused portion of facility | 665.2 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  | 892.6 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
Commitment fee on the unused portion of the credit facility (as a percent) | 0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Credit facility | Base rate |  |  |  |
Debt |  |  |  |
Basis points added to reference rate (as a percent) | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |
Credit facility | Eurodollar rate |  |  |  |
Debt |  |  |  |
Basis points added to reference rate (as a percent) | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |
Letters of credit and bankers' acceptances |  |  |  |
Debt |  |  |  |
Maximum borrowing capacity | 400.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = int_LettersOfCreditAndBankersAcceptanceMember |  |  |
Letters of credit fees (as a percent) | 2.50%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = int_LettersOfCreditAndBankersAcceptanceMember |  |  |
Letters of credit, outstanding amount | 14.8 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = int_LettersOfCreditAndBankersAcceptanceMember |  |  | 7.4 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = int_LettersOfCreditAndBankersAcceptanceMember
Term Loans |  |  |  |
Debt |  |  |  |
Increase in borrowings |  | 100.0 int_DebtInstrumentIncreaseInBorrowings / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |
Amount outstanding | 241.3 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 341.3 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  | 242.5 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Term Loans | Base rate |  |  |  |
Debt |  |  |  |
Basis points added to reference rate (as a percent) | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |
Term Loans | Eurodollar rate |  |  |  |
Debt |  |  |  |
Basis points added to reference rate (as a percent) | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |
Other uncommitted credit lines |  |  |  |
Debt |  |  |  |
Letters of credit, outstanding amount | $ 211.4 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = int_OtherUncommittedCreditLinesMember |  |  | $ 150.6 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = int_OtherUncommittedCreditLinesMember

X
- Definition Increase in borrowings during the period under the debt agreement. + References No definition available. + Details
Name: | int_DebtInstrumentIncreaseInBorrowings
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum additional borrowing capacity available under the credit facility at the entity's request subject to satisfaction of certain conditions. + References No definition available. + Details
Name: | int_LineOfCreditFacilityMaximumAdditionalBorrowingCapacity
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
Name: | us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=int_LettersOfCreditAndBankersAcceptanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=int_OtherUncommittedCreditLinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |