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v2.4.1.9

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 | $ 0 iosp_AccumulatedOtherComprehensiveIncomeUnrealizedGainLossOnDerivativesTax | $ 0 iosp_AccumulatedOtherComprehensiveIncomeUnrealizedGainLossOnDerivativesTax | $ 0 iosp_AccumulatedOtherComprehensiveIncomeUnrealizedGainLossOnDerivativesTax |
Unrecognized actuarial net losses, tax | 22.2 iosp_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanActuarialNetGainsLossesTaxes | 36.9 iosp_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanActuarialNetGainsLossesTaxes | 36.2 iosp_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanActuarialNetGainsLossesTaxes |
Adjustment of income taxes on cumulative translation adjustment |  |  | 0 iosp_AdjustmentOfPriorYearIncomeTaxesOfAccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustment | [1]
Adjustment of deferred taxes on unrecognized actuarial net gains and losses |  |  | 0 iosp_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.

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- Definition Tax effect on the total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References No definition available. + Details
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- Definition Tax effect on accumulated change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's deferred hedging gains or losses. + References No definition available. + Details
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- Definition Adjustment Of Prior Year Deferred Taxes Of Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans + References No definition available. + Details
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- Definition Adjustment Of Prior Year Income Taxes Of Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment + References No definition available. + Details
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- Details
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