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Commitments and Contingencies (Details 4) (Watson Plan) In Millions, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Mar. 07, 2014 USD ($)	Mar. 07, 2014 GBP (£)	Dec. 31, 2014 Accrued expenses and other current liabilities USD ($)	Dec. 31, 2014 Accrued expenses and other current liabilities GBP (£)
Defined benefit pension plan
Assumed pension exit obligation			$ (16.3)int_BusinessCombinationDefinedBenefitPlanAssumedPensionExitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = int_WatsonDefinedBenefitPensionPlanMember	£ 9.8int_BusinessCombinationDefinedBenefitPlanAssumedPensionExitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = int_WatsonDefinedBenefitPensionPlanMember	$ (1.5)int_BusinessCombinationDefinedBenefitPlanAssumedPensionExitObligation / us-gaap_BalanceSheetLocationAxis = int_AccruedExpensesAndOtherCurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = int_WatsonDefinedBenefitPensionPlanMember	£ 1.0int_BusinessCombinationDefinedBenefitPlanAssumedPensionExitObligation / us-gaap_BalanceSheetLocationAxis = int_AccruedExpensesAndOtherCurrentLiabilitiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = int_WatsonDefinedBenefitPensionPlanMember
Estimated benefit obligation	$ (49.8)us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = int_WatsonDefinedBenefitPensionPlanMember	£ 32.0us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = int_WatsonDefinedBenefitPensionPlanMember

X

- Definition

Represents the estimated assumed pension exit obligation in connection with an acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	int_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration