XML 89 R72.htm IDEA: XBRL DOCUMENT v3.3.1.900

Pension Plans - Fair Value of Pension Assets (Detail) - United Kingdom Plan [Member] - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair value of pension assets
Total assets at fair value	$ 763.2	$ 816.6
Cash	32.0	45.7
Total plan assets	795.2	862.3	$ 790.3
Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	512.1	739.8
Cash	32.0	45.7
Total plan assets	544.1	785.5
Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value	31.6	32.7
Total plan assets	31.6	32.7
Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	171.9	0.0
Total plan assets	171.9	0.0
Debt Securities Issued by U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	0.4	1.1
Debt Securities Issued by U.S. Government and Government Agencies [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	0.4	1.1
Debt Securities Issued by Non-U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	132.1	324.3
Debt Securities Issued by Non-U.S. Government and Government Agencies [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	132.1	324.3
Corporate Debt Securities [Member]
Fair value of pension assets
Total assets at fair value	189.7	211.4
Corporate Debt Securities [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	189.7	211.4
Residential Mortgage-Backed Securities [Member]
Fair value of pension assets
Total assets at fair value		0.2
Residential Mortgage-Backed Securities [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value		0.2
Other Asset-Backed Securities [Member]
Fair value of pension assets
Total assets at fair value	0.2	3.1
Other Asset-Backed Securities [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	0.2	3.1
Equity Securities Held for Proprietary Investment Purposes [Member]
Fair value of pension assets
Total assets at fair value	125.0	134.1
Equity Securities Held for Proprietary Investment Purposes [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	125.0	134.1
Real Estate [Member]
Fair value of pension assets
Total assets at fair value	64.7	65.6
Real Estate [Member] | Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	64.7	65.6
Insurance Contracts [Member]
Fair value of pension assets
Total assets at fair value	171.9
Insurance Contracts [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	171.9
Investments Measured At Net Asset Value [Member]
Fair value of pension assets
Total assets at fair value	47.6	44.1
Other Assets [Member]
Fair value of pension assets
Total assets at fair value	31.6	32.7
Other Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value	$ 31.6	32.7
Other Assets [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Fair value of pension assets
Total assets at fair value		$ 0.0

X

- Definition

Defined benefit plan cash.

+ References

No definition available.

+ Details

Name:	iosp_DefinedBenefitsPlanCash
Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.10)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: 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 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 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent
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 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: 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=58740216&loc=d3e1928-114920

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PlanNameAxis=iosp_UkPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iosp_NonUsGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iosp_EquitySecuritiesHeldForProprietaryInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iosp_InsuranceContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iosp_InvestmentsMeasuredAtNetAssetValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_OtherAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: