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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 | $ 247.6 us-gaap_FiniteLivedIntangibleAssetsGross | $ 175.5 us-gaap_FiniteLivedIntangibleAssetsGross |
Capitalization of internally developed software | 2.7 us-gaap_CapitalizedComputerSoftwareAdditions | 1.5 us-gaap_CapitalizedComputerSoftwareAdditions |
Exchange effect | (0.1)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments | 0 us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments |
Gross cost at March 31 | 250.2 us-gaap_FiniteLivedIntangibleAssetsGross | 177.0 us-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 | 0 iosp_AmortizationOfFiniteLivedIntangibleAssetsTranslationAdjustments | 0.1 iosp_AmortizationOfFiniteLivedIntangibleAssetsTranslationAdjustments |
Accumulated amortization at March 31 | (71.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (53.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net book amount at March 31 | $ 178.6 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 124.0 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 181.1 us-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. + References No definition available. + Details
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- Definition 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) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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