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Fair Value Measurements (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Fair value measurement, additional disclosure
Cash collateral deposits held by financial counterparties	$ 301,000,000us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset	$ 13,000,000us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
Cash collateral deposits held by financial counterparties, offset against liabilities	274,300,000us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
Cash collateral deposits held by financial counterparties, not offset	26,700,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Cash collateral received from customers	46,700,000us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue	4,700,000us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue
Commodity contracts
Derivative instruments, at their respective fair value positions
Total net assets	305,482,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	15,471,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Total net liabilities	42,035,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	14,686,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Commodity contracts | Short-term derivative assets, net
Derivative instruments, at their respective fair value positions
Total net assets	294,316,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_ShortTermDerivativeAssetsNetMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	14,723,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_ShortTermDerivativeAssetsNetMember / 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	11,166,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	748,000us-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	41,346,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_AccruedExpensesAndOtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	14,332,000us-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	689,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	354,000us-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	9,787,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	2,136,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
Total net liabilities		5,453,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
Foreign currency contracts | Short-term derivative assets, net
Derivative instruments, at their respective fair value positions
Total net assets	9,283,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_ShortTermDerivativeAssetsNetMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	2,136,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_ShortTermDerivativeAssetsNetMember / 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	504,000us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_IdentifiableIntangibleAndOtherNonCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
Foreign currency contracts | Accrued expenses and other current liabilities
Derivative instruments, at their respective fair value positions
Total net liabilities		5,306,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = int_AccruedExpensesAndOtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
Foreign currency contracts | Other long-term liabilities
Derivative instruments, at their respective fair value positions
Total net liabilities		$ 147,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

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- 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.

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

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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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