Consolidated Statements of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 960.9us-gaap_SalesRevenueNet	$ 818.8us-gaap_SalesRevenueNet	$ 776.4us-gaap_SalesRevenueNet
Cost of goods sold	(658.9)us-gaap_CostOfGoodsSold	(563.6)us-gaap_CostOfGoodsSold	(540.0)us-gaap_CostOfGoodsSold
Gross profit	302.0us-gaap_GrossProfit	255.2us-gaap_GrossProfit	236.4us-gaap_GrossProfit
Operating expenses:
Selling, general and administrative	(169.2)	(142.1)	(119.1)
Research and development	(22.2)us-gaap_ResearchAndDevelopmentExpense	(21.2)us-gaap_ResearchAndDevelopmentExpense	(19.6)us-gaap_ResearchAndDevelopmentExpense
Fair value of contingent consideration	1.9iosp_FairValueOfContingentConsideration	0iosp_FairValueOfContingentConsideration	0iosp_FairValueOfContingentConsideration
Impairment of Octane Additives segment goodwill	0us-gaap_GoodwillImpairmentLoss	(1.3)us-gaap_GoodwillImpairmentLoss	(1.2)us-gaap_GoodwillImpairmentLoss
Total operating expenses	(189.5)us-gaap_OperatingExpenses	(164.6)us-gaap_OperatingExpenses	(139.9)us-gaap_OperatingExpenses
Operating income	112.5us-gaap_OperatingIncomeLoss	90.6us-gaap_OperatingIncomeLoss	96.5us-gaap_OperatingIncomeLoss
Other net income/(expense)	1.8us-gaap_OtherNonoperatingIncomeExpense	4.1us-gaap_OtherNonoperatingIncomeExpense	(2.0)us-gaap_OtherNonoperatingIncomeExpense
Interest expense	(3.8)us-gaap_InterestExpense	(2.3)us-gaap_InterestExpense	(1.8)us-gaap_InterestExpense
Interest income	0.4us-gaap_InvestmentIncomeInterest	0.4us-gaap_InvestmentIncomeInterest	0.6us-gaap_InvestmentIncomeInterest
Income before income taxes	110.9	92.8	93.3
Income taxes	(26.8)us-gaap_IncomeTaxExpenseBenefit	(15.0)us-gaap_IncomeTaxExpenseBenefit	(26.4)us-gaap_IncomeTaxExpenseBenefit
Net income	$ 84.1us-gaap_NetIncomeLoss	$ 77.8us-gaap_NetIncomeLoss	$ 66.9us-gaap_NetIncomeLoss
Earnings per share:
Basic	$ 3.45us-gaap_EarningsPerShareBasic	$ 3.29us-gaap_EarningsPerShareBasic	$ 2.89us-gaap_EarningsPerShareBasic
Diluted	$ 3.38us-gaap_EarningsPerShareDiluted	$ 3.22us-gaap_EarningsPerShareDiluted	$ 2.81us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding (in thousands):
Basic	24,391	23,651	23,187
Diluted	24,878	24,156	23,850
Dividend declared per common share	$ 0.55	$ 0.50	$ 2.00

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