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Goodwill - Summary of Goodwill (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |  |
At January 1, Gross cost | $ 424.4 us-gaap_GoodwillGross | $ 384.2 us-gaap_GoodwillGross |
At January 1, Accumulated impairment losses | (236.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (235.2)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
At January 1, Net book amount | 187.9 us-gaap_Goodwill | 149.0 us-gaap_Goodwill |
Exchange effect | (0.4)us-gaap_GoodwillTranslationAdjustments | 0 us-gaap_GoodwillTranslationAdjustments |
Acquisitions | 88.1 us-gaap_GoodwillAcquiredDuringPeriod | 39.6 us-gaap_GoodwillAcquiredDuringPeriod |
Adjustments to purchase price allocation | 0.5 us-gaap_GoodwillPurchaseAccountingAdjustments | 0.6 us-gaap_GoodwillPurchaseAccountingAdjustments |
Impairment losses | 0 us-gaap_GoodwillImpairmentLoss | (1.3)us-gaap_GoodwillImpairmentLoss | (1.2)us-gaap_GoodwillImpairmentLoss
At December 31, Gross cost | 512.6 us-gaap_GoodwillGross | 424.4 us-gaap_GoodwillGross | 384.2 us-gaap_GoodwillGross
At December 31, Accumulated impairment losses | (236.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (236.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (235.2)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
At December 31, Net book amount | 276.1 us-gaap_Goodwill | 187.9 us-gaap_Goodwill | 149.0 us-gaap_Goodwill
Fuel Specialties [Member] |  |  |
Goodwill [Line Items] |  |  |
At January 1, Gross cost | 141.1 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 117.6 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
At January 1, Accumulated impairment losses | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
At January 1, Net book amount | 141.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 117.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
Exchange effect | (0.3)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
Acquisitions | 88.1 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 22.9 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
Adjustments to purchase price allocation | 0.5 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 0.6 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
Impairment losses | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
At December 31, Gross cost | 229.4 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 141.1 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
At December 31, Accumulated impairment losses | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
At December 31, Net book amount | 229.4 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 141.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
Performance Chemicals [Member] |  |  |
Goodwill [Line Items] |  |  |
At January 1, Gross cost | 46.8 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 30.1 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
At January 1, Accumulated impairment losses | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
At January 1, Net book amount | 46.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 30.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
Exchange effect | (0.1)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
Acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 16.7 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
Adjustments to purchase price allocation | 0 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 0 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
Impairment losses | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
At December 31, Gross cost | 46.7 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 46.8 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
At December 31, Accumulated impairment losses | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
At December 31, Net book amount | 46.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 46.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
Octane Additives [Member] |  |  |
Goodwill [Line Items] |  |  |
At January 1, Gross cost | 236.5 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 236.5 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
At January 1, Accumulated impairment losses | (236.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | (235.2)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
At January 1, Net book amount | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 1.3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
Exchange effect | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
Acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
Adjustments to purchase price allocation | 0 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 0 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
Impairment losses | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | (1.3)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
At December 31, Gross cost | 236.5 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 236.5 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
At December 31, Accumulated impairment losses | (236.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | (236.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
At December 31, Net book amount | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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