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Pension Plans - Fair Value of Pension Assets (Detail) (United Kingdom Plan [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair value of pension assets
Total assets at fair value	$ 761.2	$ 718.8
Cash	29.1	49.8
Total plan assets	790.3	768.6	708.8
Debt Securities issued by U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	1.3	1.6
Debt Securities Issued by Non-U.S. Government and Government Agencies [Member]
Fair value of pension assets
Total assets at fair value	198.7	191.3
Equity Securities Held for Proprietary Investment Purposes [Member]
Fair value of pension assets
Total assets at fair value	156.7	134.8
Corporate Debt Securities [Member]
Fair value of pension assets
Total assets at fair value	275.5	284.6
Residential Mortgage-Backed Securities [Member]
Fair value of pension assets
Total assets at fair value	0.2	0.2
Other Asset-Backed Securities [Member]
Fair value of pension assets
Total assets at fair value	3.8	3.1
Real Estate [Member]
Fair value of pension assets
Total assets at fair value	61.4	33.2
Other Assets [Member]
Fair value of pension assets
Total assets at fair value	63.6	70.0
Derivatives (Level 1 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	697.6	648.8
Cash	29.1	49.8
Total plan assets	726.7	698.6
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	1.3	1.6
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	198.7	191.3
Derivatives (Level 1 Measurement) [Member] | Equity Securities Held for Proprietary Investment Purposes [Member]
Fair value of pension assets
Total assets at fair value	156.7	134.8
Derivatives (Level 1 Measurement) [Member] | Corporate Debt Securities [Member]
Fair value of pension assets
Total assets at fair value	275.5	284.6
Derivatives (Level 1 Measurement) [Member] | Residential Mortgage-Backed Securities [Member]
Fair value of pension assets
Total assets at fair value	0.2	0.2
Derivatives (Level 1 Measurement) [Member] | Other Asset-Backed Securities [Member]
Fair value of pension assets
Total assets at fair value	3.8	3.1
Derivatives (Level 1 Measurement) [Member] | Real Estate [Member]
Fair value of pension assets
Total assets at fair value	61.4	33.2
Significant Other Observable Inputs (Level 2) [Member]
Fair value of pension assets
Total assets at fair value	25.3	39.0
Total plan assets	25.3	39.0
Significant Other Observable Inputs (Level 2) [Member] | Other Assets [Member]
Fair value of pension assets
Total assets at fair value	25.3	39.0
Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Fair value of pension assets
Total assets at fair value	38.3	31.0
Total plan assets	38.3	31.0
Non-financial Assets and Liabilities (Level 3 Measurement) [Member] | Other Assets [Member]
Fair value of pension assets
Total assets at fair value	$ 38.3	$ 31.0

X

- Definition

Defined benefit plan cash.

+ References

No definition available.

+ Details

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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 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=28361610&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=28361610&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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Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration