XML 73 R49.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Derivative Instruments - Effect on Income (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Gain (loss) on derivative |  |  |  |
Gains or (losses) recognized in income representing hedge ineffectiveness | $ 16,100,000 | $ (22,700,000) | $ (14,500,000) |
Gains or (losses) that were excluded from the assessment of the effectiveness of fair value hedges |  | 0 | 0 | $ 0
Derivative, credit-risk related contingent features |  |  |  |
Net derivative liability positions with credit contingent features |  | 11,800,000 | 15,200,000 |
Maximum potential collateral requirements |  | 11,800,000 | 15,200,000 |
Collateral posted |  | 0 | 0 |
Derivatives designated as hedging instruments | Fair value hedges |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) on Derivative Instruments |  | (35,700,000) | (25,300,000) | 86,800,000
Realized and Unrealized Gain (Loss) on Hedged Items |  | 13,000,000.0 | 10,800,000 | (70,700,000)
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) on Derivative Instruments |  | 0 | 0 | 49,300,000
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Cost of revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) on Derivative Instruments |  | (35,700,000) | (25,300,000) | 37,500,000
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts for inventory hedging | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) on Hedged Items |  | 0 | 0 | 0
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts for inventory hedging | Cost of revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Realized and Unrealized Gain (Loss) on Hedged Items |  | 13,000,000.0 | 10,800,000 | (70,700,000)
Derivatives designated as hedging instruments | Cash flow hedges |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) |  | (7,900,000) | 32,300,000 | 1,000,000.0
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion) |  | (7,600,000) | 38,800,000 | 1,800,000
Amount of Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  | (14,800,000) | (4,400,000) | 10,800,000
Derivatives designated as hedging instruments | Cash flow hedges | Commodity contracts | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) |  | (7,800,000) | (145,800,000) | 106,500,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion) |  | (41,300,000) | 18,100,000 | 7,200,000
Amount of Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  | 700,000 | (13,700,000) | 28,600,000
Derivatives designated as hedging instruments | Cash flow hedges | Commodity contracts | Cost of revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) |  | (100,000) | 178,100,000 | (105,400,000)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion) |  | 33,700,000 | 20,800,000 | (5,300,000)
Amount of Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  | (15,400,000) | 9,400,000 | (17,800,000)
Derivatives not designated as hedging instruments |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Realized and Unrealized Gain (Loss) |  | 50,800,000 | 7,300,000 | 46,300,000
Derivatives not designated as hedging instruments | Commodity contracts |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Realized and Unrealized Gain (Loss) |  | 61,800,000 | (1,900,000) | 32,700,000
Derivatives not designated as hedging instruments | Commodity contracts | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Realized and Unrealized Gain (Loss) |  | (500,000) | 29,700,000 | 171,700,000
Derivatives not designated as hedging instruments | Commodity contracts | Cost of revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Realized and Unrealized Gain (Loss) |  | 62,300,000 | (31,600,000) | (139,000,000.0)
Derivatives not designated as hedging instruments | Foreign currency contracts |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Realized and Unrealized Gain (Loss) |  | (11,000,000.0) | 9,200,000 | 13,600,000
Derivatives not designated as hedging instruments | Foreign currency contracts | Revenue |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Realized and Unrealized Gain (Loss) |  | (3,200,000) | 10,000,000.0 | 4,100,000
Derivatives not designated as hedging instruments | Foreign currency contracts | Other (expense) income, net |  |  |  |
Gain (loss) on derivative |  |  |  |
Amount of Realized and Unrealized Gain (Loss) |  | $ (7,800,000) | $ (800,000) | $ 9,500,000

X
- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
Name: | us-gaap_AdditionalCollateralAggregateFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
Name: | us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
Name: | us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
Name: | us-gaap_CollateralAlreadyPostedAggregateFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DerivativeCreditRiskRelatedContingentFeaturesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
Name: | us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
Name: | us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
Name: | us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
Name: | us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
Name: | us-gaap_GainLossOnFairValueHedgeIneffectivenessNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=int_CommodityContractInventoryHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |