XML 77 R61.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Income Taxes - Net Operating Losses and Income Tax Concessions (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income taxes |  |  |  |
Net operating loss carryforward |  | $ 13.0 | $ 4.8 |
Net operating losses |  | 42.2 | 19.9 |
Valuation allowance |  | 2.9 |  |
Annual capital in excess of par value pool of windfall income tax benefits related to employee compensation |  | 0.0 | 1.0 |
Period applicable for additional special income tax concession | 5 years |  |  |
Decrease in foreign income taxes due to special income tax concession in Singapore |  | $ 5.0 | $ 7.5 | $ 6.2
Impact of income tax concession on basic earnings per common share (in dollars per share) |  | $ 0.07 | $ 0.11 | $ 0.09
Impact of income tax concession on diluted earnings per common share (in dollars per share) |  | $ 0.07 | $ 0.10 | $ 0.09
Pester |  |  |  |
Income taxes |  |  |  |
Net operating losses |  | $ 6.0 |  |
United States | Stock compensation |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 1.6 |  |
Net operating losses |  | 4.5 |  |
Foreign | Stock compensation |  |  |  |
Income taxes |  |  |  |
Foreign tax credits |  | 0.0 | $ 0.0 |
December 31, 2016 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.1 |  |
December 31, 2020 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.6 |  |
December 31, 2021 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.1 |  |
December 31, 2022 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.1 |  |
December 31, 2023 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.3 |  |
December 31, 2024 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 1.1 |  |
December 31, 2025 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.1 |  |
March 31, 2032 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.3 |  |
March 31, 2033 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 0.5 |  |
March 31, 2034 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 1.2 |  |
December 31, 2035 |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | 5.6 |  |
Indefinite |  |  |  |
Income taxes |  |  |  |
Net operating loss carryforward |  | $ 3.0 |  |

X
- Definition Represents the APIC pool of estimated windfall tax benefits related to employee compensation. + References No definition available. + Details
Name: | int_EstimatedWindfallTaxBenefitsRelatedToEmployeeCompensation
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the impact of special tax concession on diluted earnings per share. + References No definition available. + Details
Name: | int_IncomeTaxConcessionImpactOnDilutedEarningsPerShare
Namespace Prefix: | int_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the decrease in foreign taxes due to special tax concession. + References No definition available. + Details
Name: | int_IncomeTaxConcessionImpactOnForeignTaxes
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the impact of special tax concession on basic earnings per share. + References No definition available. + Details
Name: | int_IncometaxConcessionImpactOnBasicEarningsPerShare
Namespace Prefix: | int_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period applicable for income tax concession. + References No definition available. + Details
Name: | int_PeriodApplicableIncomeTaxConcession
Namespace Prefix: | int_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
Name: | us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_OperatingLossCarryforwardsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=int_PesterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_StockCompensationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31December2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31December2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31December2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31December2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_Expiration31December2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_Expiration31December2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31December2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31March2032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31March2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31March2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_ExpirationOn31December2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | int_DeferredTaxAssetExpirationDateAxis=int_IndefiniteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |