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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Net sales $ 1,012.3 $ 960.9 $ 818.8
Cost of goods sold (666.3) (658.9) (563.6)
Gross profit 346.0 302.0 255.2
Operating expenses:      
Selling, general and administrative (206.7) (169.2) (142.1)
Research and development (25.3) (22.2) (21.2)
Adjustment to fair value of contingent consideration 40.7 1.9 0.0
Profit on disposal of subsidiary 1.6 0.0 0.0
Impairment of Octane Additives segment goodwill 0.0 0.0 (1.3)
Total operating expenses (189.7) (189.5) (164.6)
Operating income 156.3 112.5 90.6
Other net income 0.0 1.8 4.1
Interest expense, net (4.0) (3.4) (1.9)
Income before income taxes 152.3 110.9 92.8
Income taxes (32.8) (26.8) (15.0)
Net income $ 119.5 $ 84.1 $ 77.8
Earnings per share:      
Basic $ 4.96 $ 3.45 $ 3.29
Diluted $ 4.86 $ 3.38 $ 3.22
Weighted average shares outstanding (in thousands):      
Basic 24,107 24,391 23,651
Diluted 24,612 24,878 24,156
Dividend declared per common share $ 0.61 $ 0.55 $ 0.50