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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair value measurement, additional disclosure
Cash collateral deposits held by financial counterparties	$ 257.4us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset	$ 301.0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
Cash collateral deposits held by financial counterparties, offset against liabilities	207.1us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset	274.3us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
Cash collateral deposits held by financial counterparties, not offset	50.3us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	26.7us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Cash collateral received from customers	32.0us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue	46.7us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue
Commodity contracts
Derivative instruments, at their respective fair value positions
Total net assets	235.0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	305.5us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Total net liabilities	41.8us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	42.0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Commodity contracts | Other current assets
Derivative instruments, at their respective fair value positions
Total net assets	221.4us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	294.3us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Commodity contracts | Identifiable intangible and other non-current assets
Derivative instruments, at their respective fair value positions
Total net assets	13.6us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	11.2us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Commodity contracts | Accrued expenses and other current liabilities
Derivative instruments, at their respective fair value positions
Total net liabilities	39.3us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_AccruedExpensesAndOtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	41.3us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_AccruedExpensesAndOtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Commodity contracts | Other long-term liabilities
Derivative instruments, at their respective fair value positions
Total net liabilities	2.5us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	0.7us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Foreign currency contracts
Derivative instruments, at their respective fair value positions
Total net assets	12.5us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	9.8us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
Foreign currency contracts | Other current assets
Derivative instruments, at their respective fair value positions
Total net assets	11.5us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	9.3us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
Foreign currency contracts | Identifiable intangible and other non-current assets
Derivative instruments, at their respective fair value positions
Total net assets	$ 1.0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	$ 0.5us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

X

- Definition

Fair value as of the balance sheet date of customer securities accepted as collateral by the entity that it is permitted by contract or custom to sell or re-pledge to counterparties as collateral.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (c)(1)

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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-Publisher FASB

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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