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Pension Plans (Details 3) (UK Plan [Member], Significant Unobservable Inputs (Level 3) [Member], Other assets [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
UK Plan [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other assets [Member]
Reconciliation of the fair value of Plan assets
Beginning balance	$ 28.1	$ 23.3
Realized/unrealized gains/(losses):
Relating to assets still held at the reporting date	1.3	1.0
Relating to assets sold during the period	0	(0.5)
Purchases, issuances and settlements	0.5	4.5
Exchange effect	1.1	(0.2)
Ending balance	$ 31.0	$ 28.1

X

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset exchange effect.

+ References

No definition available.

+ Details

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Namespace Prefix:	iosp_
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Balance Type:	credit
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X

- Details

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X

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset sold gain loss included in earnings one.

+ References

No definition available.

+ Details

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Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset still held gain loss included in earnings one.

+ References

No definition available.

+ Details

Name:	iosp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetStillHeldGainLossIncludedInEarningsOne
Namespace Prefix:	iosp_
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X

- Definition

Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to assets measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

X

- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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