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Pension Plans - Fair Value of Pension Assets (Detail) (United Kingdom Plan [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Fair value of pension assets |  |  |
Total assets at fair value | $ 816.6 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets | $ 761.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |
Cash | 45.7 iosp_DefinedBenefitsPlanCash | 29.1 iosp_DefinedBenefitsPlanCash |
Total plan assets | 862.3 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent | 790.3 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent | 768.6 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent
Debt Securities Issued by U.S. Government and Government Agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 1.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 1.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Debt Securities Issued by Non-U.S. Government and Government Agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 324.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 198.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Equity Securities Held for Proprietary Investment Purposes [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 134.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_EquitySecuritiesHeldForProprietaryInvestmentMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 156.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_EquitySecuritiesHeldForProprietaryInvestmentMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Corporate Debt Securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 211.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 275.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Residential Mortgage-Backed Securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 0.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 0.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Other Asset-Backed Securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 3.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 3.8 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Real Estate [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 65.6 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RealEstateMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 61.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RealEstateMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Other Assets [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 76.8 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 63.6 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Derivatives (Level 1 Measurement) [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 739.8 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 697.6 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Cash | 45.7 iosp_DefinedBenefitsPlanCash / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 29.1 iosp_DefinedBenefitsPlanCash / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Total plan assets | 785.5 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 726.7 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Derivatives (Level 1 Measurement) [Member] | Debt Securities Issued by U.S. Government and Government Agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 1.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 1.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Derivatives (Level 1 Measurement) [Member] | Debt Securities Issued by Non-U.S. Government and Government Agencies [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 324.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 198.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Derivatives (Level 1 Measurement) [Member] | Equity Securities Held for Proprietary Investment Purposes [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 134.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_EquitySecuritiesHeldForProprietaryInvestmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 156.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_EquitySecuritiesHeldForProprietaryInvestmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Derivatives (Level 1 Measurement) [Member] | Corporate Debt Securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 211.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 275.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Derivatives (Level 1 Measurement) [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 0.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 0.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Derivatives (Level 1 Measurement) [Member] | Other Asset-Backed Securities [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 3.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 3.8 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Derivatives (Level 1 Measurement) [Member] | Real Estate [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 65.6 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RealEstateMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 61.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RealEstateMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 32.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 25.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Total plan assets | 32.7 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 25.3 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Significant Other Observable Inputs (Level 2) [Member] | Other Assets [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 32.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | 25.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Non-financial Assets and Liabilities (Level 3 Measurement) [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | 44.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 38.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Total plan assets | 44.1 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_PlanNameAxis = iosp_UkPlanMember | 38.3 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_PlanNameAxis = iosp_UkPlanMember |
Non-financial Assets and Liabilities (Level 3 Measurement) [Member] | Other Assets [Member] |  |  |
Fair value of pension assets |  |  |
Total assets at fair value | $ 44.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember | $ 38.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember |

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- Definition Defined benefit plan cash. + References No definition available. + Details
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- Definition This represents the entire assets recognized in the balance sheet that are associated with the defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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