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Consolidated Statements of Stockholders' Equity (USD $) In Millions | Total | Bachman [Member] | Chemsil [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Additional Paid-In Capital [Member] Bachman [Member] | Additional Paid-In Capital [Member] Chemsil [Member] | Treasury Stock [Member] | Treasury Stock [Member] Bachman [Member] | Treasury Stock [Member] Chemsil [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
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Beginning Balance at Dec. 31, 2011 |  | $ 343.1 us-gaap_StockholdersEquity |  |  | $ 0.3 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 291.5 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | $ (88.1)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | $ 233.9 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (94.5)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning balance before adjustments |  | 343.1 iosp_StockholdersEquityBeforeAdjustmentForIncomeAndDeferredTaxes |  |  | 0.3 iosp_StockholdersEquityBeforeAdjustmentForIncomeAndDeferredTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 291.5 iosp_StockholdersEquityBeforeAdjustmentForIncomeAndDeferredTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (88.1)iosp_StockholdersEquityBeforeAdjustmentForIncomeAndDeferredTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | 241.5 iosp_StockholdersEquityBeforeAdjustmentForIncomeAndDeferredTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (102.1)iosp_StockholdersEquityBeforeAdjustmentForIncomeAndDeferredTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Adjustment for income taxes (1) | [1] | 0 iosp_AdjustmentOfPriorYearIncomeTaxesOfAccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustment |  |  |  |  |  |  |  |  |  | (2.7)iosp_AdjustmentOfPriorYearIncomeTaxesOfAccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 2.7 iosp_AdjustmentOfPriorYearIncomeTaxesOfAccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Adjustment for deferred taxes (2) | [2] | 0 iosp_AdjustmentOfPriorYearDeferredTaxesOfAccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlans |  |  |  |  |  |  |  |  |  | (4.9)iosp_AdjustmentOfPriorYearDeferredTaxesOfAccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 4.9 iosp_AdjustmentOfPriorYearDeferredTaxesOfAccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income |  | 66.9 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | 66.9 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividend paid |  | (46.7)us-gaap_Dividends |  |  |  |  |  |  |  |  |  | (46.7)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Changes in cumulative translation adjustment |  | 7.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  |  |  |  |  |  |  | 7.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Changes in unrealized gains/(losses) on derivative instruments, net of tax |  | (0.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  |  |  |  |  |  |  |  |  | (0.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Treasury stock re-issued |  | 1.0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  | (3.5)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 4.5 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Treasury stock repurchased |  | (1.4)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |  |  | (1.4)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Stock option compensation |  | 2.1 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  | 2.1 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Fair value of Strata acquisition-related contingently issuable shares |  | 2.0 iosp_AdjustmentsToAdditionalPaidInCapitalAcquisitionRelatedContingentlyIssuableShares |  |  |  | 2.0 iosp_AdjustmentsToAdditionalPaidInCapitalAcquisitionRelatedContingentlyIssuableShares / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Amortization of prior service credit, net of tax |  | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax |  |  |  |  |  |  |  |  |  |  | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Amortization of actuarial net losses, net of tax |  | 2.4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax |  |  |  |  |  |  |  |  |  |  | 2.4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Actuarial net (losses) gains arising during the year, net of tax |  | (58.5)us-gaap_DefinedBenefitPlanActuarialGainLoss |  |  |  |  |  |  |  |  |  |  | (58.5)us-gaap_DefinedBenefitPlanActuarialGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance at Dec. 31, 2012 |  | 317.0 us-gaap_StockholdersEquity |  |  | 0.3 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 292.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (85.0)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | 254.1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (144.5)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income |  | 77.8 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | 77.8 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividend paid |  | (12.0)us-gaap_Dividends |  |  |  |  |  |  |  |  |  | (12.0)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Changes in cumulative translation adjustment |  | 1.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  |  |  |  |  |  |  | 1.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Changes in unrealized gains/(losses) on derivative instruments, net of tax |  | (0.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  |  |  |  |  |  |  |  |  | (0.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Treasury stock re-issued |  | 4.6 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  | (4.2)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 8.8 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Treasury stock repurchased |  | (3.7)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |  |  | (3.7)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Excess tax benefit from stock based payment arrangements |  | 3.8 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  |  |  | 3.8 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Stock option compensation |  | 2.5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  | 2.5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Fair value of acquisition-related consideration |  |  | 15.0 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember | 6.2 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = iosp_ChemsilMember |  |  | 10.5 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 4.1 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = iosp_ChemsilMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 4.5 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 2.1 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = iosp_ChemsilMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Amortization of prior service credit, net of tax |  | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax |  |  |  |  |  |  |  |  |  |  | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Amortization of actuarial net losses, net of tax |  | 4.8 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax |  |  |  |  |  |  |  |  |  |  | 4.8 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Actuarial net (losses) gains arising during the year, net of tax |  | (6.7)us-gaap_DefinedBenefitPlanActuarialGainLoss |  |  |  |  |  |  |  |  |  |  | (6.7)us-gaap_DefinedBenefitPlanActuarialGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance at Dec. 31, 2013 |  | 409.4 us-gaap_StockholdersEquity |  |  | 0.3 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 308.8 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (73.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | 319.9 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (146.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income |  | 84.1 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | 84.1 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividend paid |  | (13.4)us-gaap_Dividends |  |  |  |  |  |  |  |  |  | (13.4)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Changes in cumulative translation adjustment |  | (18.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  |  |  |  |  |  |  | (18.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Changes in unrealized gains/(losses) on derivative instruments, net of tax |  | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  |  |  |  |  |  |  |  |  |
Treasury stock re-issued |  | 0.5 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  | (1.0)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1.5 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Treasury stock repurchased |  | (6.9)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  |  |  | (6.9)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Excess tax benefit from stock based payment arrangements |  | 0.4 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  |  |  | 0.4 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Stock option compensation |  | 2.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  | 2.6 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Fair value of contingent consideration |  | (0.8)iosp_FairValueOfContingentConsiderationInRelationToAcquisition |  |  |  | (2.0)iosp_FairValueOfContingentConsiderationInRelationToAcquisition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 1.2 iosp_FairValueOfContingentConsiderationInRelationToAcquisition / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Amortization of prior service credit, net of tax |  | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax |  |  |  |  |  |  |  |  |  |  | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Amortization of actuarial net losses, net of tax |  | 4.3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax |  |  |  |  |  |  |  |  |  |  | 4.3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Actuarial net (losses) gains arising during the year, net of tax |  | 54.7 us-gaap_DefinedBenefitPlanActuarialGainLoss |  |  |  |  |  |  |  |  |  |  | 54.7 us-gaap_DefinedBenefitPlanActuarialGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance at Dec. 31, 2014 |  | $ 515.9 us-gaap_StockholdersEquity |  |  | $ 0.3 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 308.8 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | $ (78.7)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | $ 391.8 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (106.3)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
[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 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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