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Income Taxes - Details of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:        
Foreign tax credits $ 0.8us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign $ 4.5us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign    
Accrued expenses 0.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 3.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals    
Stock options 5.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 5.2us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost    
Excess of tax over book basis in property, plant and equipment 0.4us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 0.9us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment    
Net operating loss carry forwards 0.6us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 0.3us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Pension assets 0.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 6.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions    
Other intangible assets 5.3us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 1.0us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets    
Other 5.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 3.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther    
Subtotal 18.5us-gaap_DeferredTaxAssetsGross 25.7us-gaap_DeferredTaxAssetsGross    
Less valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance (7.5)us-gaap_DeferredTaxAssetsValuationAllowance
Total net deferred tax assets 18.5us-gaap_DeferredTaxAssetsNet 25.7us-gaap_DeferredTaxAssetsNet    
Deferred tax liabilities:        
Excess of book over tax basis in property, plant and equipment (2.7)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (2.0)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Goodwill amortization (9.6)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill (7.2)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill    
Other intangible assets 0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (0.3)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets    
Excess of book over tax basis in tax deductible goodwill (3.4)iosp_DeferredTaxLiabilitiesExcessOfBookValueOverTaxBasisInTaxDeductibleGoodwill (0.2)iosp_DeferredTaxLiabilitiesExcessOfBookValueOverTaxBasisInTaxDeductibleGoodwill    
Excess of book over tax basis in intangible assets (7.2)iosp_DeferredTaxLiabilitiesExcessOfBookValueOverTaxBasisInIntangibleAssets (7.5)iosp_DeferredTaxLiabilitiesExcessOfBookValueOverTaxBasisInIntangibleAssets    
Pension liabilities (9.0)iosp_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPensions 0iosp_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPensions    
Other (0.5)us-gaap_DeferredTaxLiabilitiesOther (0.9)us-gaap_DeferredTaxLiabilitiesOther    
Total deferred tax liabilities (32.4)us-gaap_DeferredIncomeTaxLiabilities (18.1)us-gaap_DeferredIncomeTaxLiabilities    
Net deferred tax (liability)/asset (13.9)us-gaap_DeferredTaxAssetsLiabilitiesNet 7.6us-gaap_DeferredTaxAssetsLiabilitiesNet    
Current portion of deferred tax assets 8.4us-gaap_DeferredTaxAssetsNetCurrent 8.7us-gaap_DeferredTaxAssetsNetCurrent    
Deferred tax assets, net of current portion 0.7us-gaap_DeferredTaxAssetsNetNoncurrent 8.6us-gaap_DeferredTaxAssetsNetNoncurrent    
Current portion of deferred tax liabilities 0us-gaap_DeferredTaxLiabilitiesCurrent (0.2)us-gaap_DeferredTaxLiabilitiesCurrent    
Deferred tax liabilities, net of current portion (23.0)us-gaap_DeferredTaxLiabilitiesNoncurrent (9.5)us-gaap_DeferredTaxLiabilitiesNoncurrent    
Net deferred tax (liability)/asset $ (13.9)us-gaap_DeferredTaxAssetsLiabilitiesNet $ 7.6us-gaap_DeferredTaxAssetsLiabilitiesNet