XML 72 R66.htm IDEA: XBRL DOCUMENT v2.4.0.6

Stockholders' Equity and Share Based Compensation Plans (Details 3) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Fair value of liability cash-settled stock appreciation rights
Beginning balance	$ 2.2	$ 0.8
Compensation charge	5.2	0.4
Ending balance	$ 7.4	$ 1.2

X

- Definition

Change in fair value of liability cash-settled stock appreciation rights.

+ References

No definition available.

+ Details

Name:	iosp_ChangeInFairValueOfLiabilityCashSettledStockAppreciationRights
Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Fair value of liability cash-settled stock appreciation rights.

+ References

No definition available.

+ Details

Name:	iosp_FairValueOfLiabilityCashSettledStockAppreciationRights
Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	iosp_FairValueOfLiabilityCashSettledStockAppreciationRightsAbstract
Namespace Prefix:	iosp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration