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Accumulated Other Comprehensive Loss (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Unrealized gains on derivative instruments, tax $ 0iosp_AccumulatedOtherComprehensiveIncomeUnrealizedGainLossOnDerivativesTax $ 0iosp_AccumulatedOtherComprehensiveIncomeUnrealizedGainLossOnDerivativesTax $ 0iosp_AccumulatedOtherComprehensiveIncomeUnrealizedGainLossOnDerivativesTax
Unrecognized actuarial net losses, tax 22.2iosp_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanActuarialNetGainsLossesTaxes 36.9iosp_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanActuarialNetGainsLossesTaxes 36.2iosp_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanActuarialNetGainsLossesTaxes
Adjustment of income taxes on cumulative translation adjustment     0iosp_AdjustmentOfPriorYearIncomeTaxesOfAccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustment [1]
Adjustment of deferred taxes on unrecognized actuarial net gains and losses     0iosp_AdjustmentOfPriorYearDeferredTaxesOfAccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlans [2]
Accumulated Other Comprehensive Loss [Member]      
Adjustment of income taxes on cumulative translation adjustment     (2.7)iosp_AdjustmentOfPriorYearIncomeTaxesOfAccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 [1]
Adjustment of deferred taxes on unrecognized actuarial net gains and losses     $ (4.9)iosp_AdjustmentOfPriorYearDeferredTaxesOfAccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 [2]
[1] Adjustment to account for the income taxes on historical foreign exchange gains and losses on intercompany loans into cumulative translation adjustment.
[2] Adjustment to reverse the impact on deferred taxes of a change in the associated tax rate on the unrecognized actuarial net losses in 2010 and 2011.