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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
Fair value of pension assets
Total assets at fair value	$ 816.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets	$ 761.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Cash	45.7iosp_DefinedBenefitsPlanCash	29.1iosp_DefinedBenefitsPlanCash
Total plan assets	862.3us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent	790.3us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent	768.6us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent
Debt Securities Issued by U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	1.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	1.3us-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	324.3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	198.7us-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	134.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_EquitySecuritiesHeldForProprietaryInvestmentMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	156.7us-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	211.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	275.5us-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	0.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	0.2us-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	3.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	3.8us-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	65.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RealEstateMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	61.4us-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	76.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	63.6us-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	739.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	697.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember
Cash	45.7iosp_DefinedBenefitsPlanCash / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	29.1iosp_DefinedBenefitsPlanCash / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember
Total plan assets	785.5us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	726.7us-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	1.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	1.3us-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	324.3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	198.7us-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	134.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = iosp_EquitySecuritiesHeldForProprietaryInvestmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	156.7us-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	211.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	275.5us-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	0.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	0.2us-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	3.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	3.8us-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	65.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_RealEstateMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	61.4us-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	32.7us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	25.3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_PlanNameAxis = iosp_UkPlanMember
Total plan assets	32.7us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	25.3us-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	32.7us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	25.3us-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	44.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	38.3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_PlanNameAxis = iosp_UkPlanMember
Total plan assets	44.1us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_PlanNameAxis = iosp_UkPlanMember	38.3us-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	$ 44.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember	$ 38.3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_OtherAssetsMember / us-gaap_PlanNameAxis = iosp_UkPlanMember

X

- Definition

Defined benefit plan cash.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Details

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