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Other Intangible Assets - Summary of Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1	$ 247.6us-gaap_FiniteLivedIntangibleAssetsGross	$ 175.5us-gaap_FiniteLivedIntangibleAssetsGross
Capitalization of internally developed software	2.7us-gaap_CapitalizedComputerSoftwareAdditions	1.5us-gaap_CapitalizedComputerSoftwareAdditions
Exchange effect	(0.1)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments	0us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
Gross cost at March 31	250.2us-gaap_FiniteLivedIntangibleAssetsGross	177.0us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization at January 1	(66.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(48.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Amortization expense	(5.1)us-gaap_AmortizationOfIntangibleAssets	(4.4)us-gaap_AmortizationOfIntangibleAssets
Exchange effect	0iosp_AmortizationOfFiniteLivedIntangibleAssetsTranslationAdjustments	0.1iosp_AmortizationOfFiniteLivedIntangibleAssetsTranslationAdjustments
Accumulated amortization at March 31	(71.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(53.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net book amount at March 31	$ 178.6us-gaap_IntangibleAssetsNetExcludingGoodwill	$ 124.0us-gaap_IntangibleAssetsNetExcludingGoodwill	$ 181.1us-gaap_IntangibleAssetsNetExcludingGoodwill

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- Definition

Amount of increase (decrease) to amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

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Additions made to capitalized computer software costs during the period.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 2

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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

-Publisher FASB

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-Topic 350

-SubTopic 30

-Section 45

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-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274



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