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Income Taxes (Details 4) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes |  |  |
Increase (decrease) in additional liabilities related to unrecognized tax liabilities | $ (2,100,000)int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease | $ 4,100,000 int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease |
Increase (decrease) in assets related to unrecognized tax assets | (4,500,000)int_UnrecognizedTaxAssetsPeriodIncreaseDecrease | 1,800,000 int_UnrecognizedTaxAssetsPeriodIncreaseDecrease |
Decrease in Unrecognized Tax Liabilities related to a foreign currency translation expense | (500,000)int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease | (100,000)int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease |
Unrecognized Tax Liabilities | 33,000,000 int_UnrecognizedTaxLiabilities | 36,200,000 int_UnrecognizedTaxLiabilities |
Unrecognized Tax Assets | 2,300,000 int_UnrecognizedTaxAssets | 6,900,000 int_UnrecognizedTaxAssets |
Reconciliation of total amounts of unrecognized income tax benefits |  |  |
Unrecognized Tax Liabilities - opening balance | 26,487,000 us-gaap_UnrecognizedTaxBenefits | 22,394,000 us-gaap_UnrecognizedTaxBenefits | 25,574,000 us-gaap_UnrecognizedTaxBenefits
Gross increases - tax positions in prior period | 65,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 2,559,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Gross decreases - tax positions in prior period | (2,833,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (39,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (7,659,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Gross increases - tax positions in current period | 6,636,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 4,999,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 5,730,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Settlements | (3,597,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities |  |
Lapse of statute of limitations | (2,414,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (3,426,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (1,251,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Unrecognized Tax Liabilities - ending balance | 24,344,000 us-gaap_UnrecognizedTaxBenefits | 26,487,000 us-gaap_UnrecognizedTaxBenefits | 22,394,000 us-gaap_UnrecognizedTaxBenefits
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor | 22,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Expected reduction in effective income tax rate if uncertain tax positions are settled by the taxing authorities in the entity's favor (as a percent) | 8.20%int_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRatePercentage |  |
Interest and penalties expense |  |  |
Interest related to unrecognized tax benefits, recorded as (income) expense | (600,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | (600,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | (700,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Penalties related to unrecognized tax benefits, recorded as income tax (income) expense | (300,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense | (300,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense | (1,500,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense
Accrued interest and penalties |  |  |
Accrued interest related to unrecognized tax benefits | 4,200,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 4,900,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |
Accrued penalties related to unrecognized tax benefits | $ 4,500,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued | $ 4,800,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued |

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