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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 84.1 us-gaap_NetIncomeLoss | $ 77.8 us-gaap_NetIncomeLoss | $ 66.9 us-gaap_NetIncomeLoss
Changes in cumulative translation adjustment | (18.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 1.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 7.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Changes in unrealized gains/(losses) on derivative instruments, net of tax of $0.0 million, $0.0 million and $0.0 million, respectively | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | (0.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | (0.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Amortization of prior service credit, net of tax of $0.3 million, $0.3 million and $0.3 million, respectively | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | (1.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Amortization of actuarial net losses, net of tax of $(1.1) million, $(1.4) million and $(0.8) million, respectively | 4.3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | 4.8 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | 2.4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Actuarial net gains/(losses) arising during the year, net of tax of $(13.9) million, $1.8 million and $17.8 million, respectively | 54.7 iosp_OtherComprehensiveIncomeLossNetActuarialGainLossNetOfTax | (6.7)iosp_OtherComprehensiveIncomeLossNetActuarialGainLossNetOfTax | (58.5)iosp_OtherComprehensiveIncomeLossNetActuarialGainLossNetOfTax
Total comprehensive income | $ 124.1 us-gaap_ComprehensiveIncomeNetOfTax | $ 76.0 us-gaap_ComprehensiveIncomeNetOfTax | $ 16.9 us-gaap_ComprehensiveIncomeNetOfTax

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