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Consolidated Statements of Income (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Net sales $ 228.2 $ 192.8 $ 670.2 $ 577.2
Cost of goods sold (154.6) (135.4) (462.3) (396.6)
Gross profit 73.6 57.4 207.9 180.6
Operating expenses:        
Selling, general and administrative (42.4) (31.8) (122.1) (99.0)
Research and development (6.0) (5.7) (17.3) (16.6)
Impairment of Octane Additives segment goodwill 0 (0.4) 0 (1.0)
Total operating expenses (48.4) (37.9) (139.4) (116.6)
Operating income 25.2 19.5 68.5 64.0
Other net income/(expense) 1.0 (0.8) 2.2 (0.8)
Interest expense (0.9) (0.5) (2.8) (1.4)
Interest income 0.1 0.1 0.3 0.3
Income before income taxes 25.4 18.3 68.2 62.1
Income taxes (4.6) (4.3) (12.0) (13.0)
Net income $ 20.8 $ 14.0 $ 56.2 $ 49.1
Earnings per share:        
Basic $ 0.85 $ 0.59 $ 2.30 $ 2.09
Diluted $ 0.83 $ 0.58 $ 2.26 $ 2.04
Weighted average shares outstanding (in thousands):        
Basic 24,420 23,621 24,394 23,518
Diluted 24,915 24,096 24,849 24,085