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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]        
Net sales $ 192.8 $ 183.4 $ 577.2 $ 562.7
Cost of goods sold (135.4) (132.7) (396.6) (391.3)
Gross profit 57.4 50.7 180.6 171.4
Operating expenses:        
Selling, general and administrative (31.8) (28.3) (99.0) (83.4)
Research and development (5.7) (4.8) (16.6) (14.4)
Restructuring charge 0 (0.1) 0 (0.2)
Impairment of Octane Additives segment goodwill (0.4) (0.3) (1.0) (0.9)
Profit on disposal 0 0.1 0 0.1
Total operating expenses (37.9) (33.4) (116.6) (98.8)
Operating income 19.5 17.3 64.0 72.6
Other net income/(expense) (0.8) (0.1) (0.8) (3.3)
Interest expense (0.5) (0.4) (1.4) (1.3)
Interest income 0.1 0.2 0.3 0.5
Income before income taxes 18.3 17.0 62.1 68.5
Income taxes (4.3) (1.5) (13.0) (12.9)
Net income $ 14.0 $ 15.5 $ 49.1 $ 55.6
Earnings per share:        
Basic $ 0.59 $ 0.67 $ 2.09 $ 2.40
Diluted $ 0.58 $ 0.65 $ 2.04 $ 2.33
Weighted average shares outstanding (in thousands):        
Basic 23,621 23,240 23,518 23,148
Diluted 24,096 23,923 24,085 23,872