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v2.4.1.9

Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | $ 32.4 us-gaap_RestructuringReserve | $ 30.4 us-gaap_RestructuringReserve | $ 28.6 us-gaap_RestructuringReserve
Charge for the period | 5.0 iosp_RestructuringChargesIncludingAssetRetirementObligations | 3.9 iosp_RestructuringChargesIncludingAssetRetirementObligations | 4.2 iosp_RestructuringChargesIncludingAssetRetirementObligations
Utilized in the period | (2.0)us-gaap_PaymentsForRestructuring | (2.0)us-gaap_PaymentsForRestructuring | (2.7)us-gaap_PaymentsForRestructuring
Released in the period | (1.0)us-gaap_RestructuringReservePeriodIncreaseDecrease |  |
Exchange effect | (0.3)us-gaap_RestructuringReserveTranslationAdjustment | 0.1 us-gaap_RestructuringReserveTranslationAdjustment | 0.3 us-gaap_RestructuringReserveTranslationAdjustment
Ending Balance | 34.1 us-gaap_RestructuringReserve | 32.4 us-gaap_RestructuringReserve | 30.4 us-gaap_RestructuringReserve
Due within one year | (5.7)us-gaap_RestructuringReserveCurrent | (6.2)us-gaap_RestructuringReserveCurrent | (5.1)us-gaap_RestructuringReserveCurrent
Due after one year | 28.4 us-gaap_RestructuringReserveNoncurrent | 26.2 us-gaap_RestructuringReserveNoncurrent | 25.3 us-gaap_RestructuringReserveNoncurrent
Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 1.0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1.5 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Charge for the period | 0 iosp_RestructuringChargesIncludingAssetRetirementObligations / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 0 iosp_RestructuringChargesIncludingAssetRetirementObligations / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 0.2 iosp_RestructuringChargesIncludingAssetRetirementObligations / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Utilized in the period | 0 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (0.1)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (0.6)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Released in the period | (1.0)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |
Exchange effect | 0 us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 0 us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 0 us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Ending Balance | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1.0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Due within one year | 0 us-gaap_RestructuringReserveCurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 0 us-gaap_RestructuringReserveCurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (0.1)us-gaap_RestructuringReserveCurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Due after one year | 0 us-gaap_RestructuringReserveNoncurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1.0 us-gaap_RestructuringReserveNoncurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 1.0 us-gaap_RestructuringReserveNoncurrent / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Remediation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 31.4 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | 29.3 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | 27.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember
Charge for the period | 5.0 iosp_RestructuringChargesIncludingAssetRetirementObligations / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | 3.9 iosp_RestructuringChargesIncludingAssetRetirementObligations / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | 4.0 iosp_RestructuringChargesIncludingAssetRetirementObligations / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember
Utilized in the period | (2.0)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | (1.9)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | (2.1)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember
Released in the period | 0 us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember |  |
Exchange effect | (0.3)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | 0.1 us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | 0.3 us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember
Ending Balance | 34.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | 31.4 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | 29.3 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember
Due within one year | (5.7)us-gaap_RestructuringReserveCurrent / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | (6.2)us-gaap_RestructuringReserveCurrent / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | (5.0)us-gaap_RestructuringReserveCurrent / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember
Due after one year | $ 28.4 us-gaap_RestructuringReserveNoncurrent / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | $ 25.2 us-gaap_RestructuringReserveNoncurrent / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember | $ 24.3 us-gaap_RestructuringReserveNoncurrent / us-gaap_RestructuringCostAndReserveAxis = iosp_EnvironmentalRemediationMember

X
- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, including asset retirement obligations. + References No definition available. + Details
Name: | iosp_RestructuringChargesIncludingAssetRetirementObligations
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + 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 + Details
Name: | us-gaap_PaymentsForRestructuring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
Name: | us-gaap_RestructuringReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Paragraph Question 4 + Details
Name: | us-gaap_RestructuringReserveNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net total Increase or Decrease in the accrual for restructuring costs during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |