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v2.4.1.9

Income Taxes - Details of Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Deferred tax assets: |  |  |  |
Foreign tax credits | $ 0.8 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | $ 4.5 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  |
Accrued expenses | 0.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 3.4 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals |  |
Stock options | 5.0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 5.2 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |  |
Excess of tax over book basis in property, plant and equipment | 0.4 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 0.9 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |  |
Net operating loss carry forwards | 0.6 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 0.3 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |
Pension assets | 0.7 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | 6.5 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions |  |
Other intangible assets | 5.3 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 1.0 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |  |
Other | 5.4 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther | 3.9 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther |  |
Subtotal | 18.5 us-gaap_DeferredTaxAssetsGross | 25.7 us-gaap_DeferredTaxAssetsGross |  |
Less valuation allowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | (7.5)us-gaap_DeferredTaxAssetsValuationAllowance
Total net deferred tax assets | 18.5 us-gaap_DeferredTaxAssetsNet | 25.7 us-gaap_DeferredTaxAssetsNet |  |
Deferred tax liabilities: |  |  |  |
Excess of book over tax basis in property, plant and equipment | (2.7)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (2.0)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  |
Goodwill amortization | (9.6)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill | (7.2)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill |  |
Other intangible assets | 0 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (0.3)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets |  |
Excess of book over tax basis in tax deductible goodwill | (3.4)iosp_DeferredTaxLiabilitiesExcessOfBookValueOverTaxBasisInTaxDeductibleGoodwill | (0.2)iosp_DeferredTaxLiabilitiesExcessOfBookValueOverTaxBasisInTaxDeductibleGoodwill |  |
Excess of book over tax basis in intangible assets | (7.2)iosp_DeferredTaxLiabilitiesExcessOfBookValueOverTaxBasisInIntangibleAssets | (7.5)iosp_DeferredTaxLiabilitiesExcessOfBookValueOverTaxBasisInIntangibleAssets |  |
Pension liabilities | (9.0)iosp_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPensions | 0 iosp_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPensions |  |
Other | (0.5)us-gaap_DeferredTaxLiabilitiesOther | (0.9)us-gaap_DeferredTaxLiabilitiesOther |  |
Total deferred tax liabilities | (32.4)us-gaap_DeferredIncomeTaxLiabilities | (18.1)us-gaap_DeferredIncomeTaxLiabilities |  |
Net deferred tax (liability)/asset | (13.9)us-gaap_DeferredTaxAssetsLiabilitiesNet | 7.6 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |
Current portion of deferred tax assets | 8.4 us-gaap_DeferredTaxAssetsNetCurrent | 8.7 us-gaap_DeferredTaxAssetsNetCurrent |  |
Deferred tax assets, net of current portion | 0.7 us-gaap_DeferredTaxAssetsNetNoncurrent | 8.6 us-gaap_DeferredTaxAssetsNetNoncurrent |  |
Current portion of deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilitiesCurrent | (0.2)us-gaap_DeferredTaxLiabilitiesCurrent |  |
Deferred tax liabilities, net of current portion | (23.0)us-gaap_DeferredTaxLiabilitiesNoncurrent | (9.5)us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Net deferred tax (liability)/asset | $ (13.9)us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 7.6 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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