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Consolidated Statements of Income (Unaudited) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Consolidated Statements of Income [Abstract]    
Net sales $ 199.4 $ 200.8
Cost of goods sold (135.6) (136.8)
Gross profit 63.8 64.0
Operating expenses:    
Selling, general and administrative (35.7) (27.8)
Research and development (5.6) (4.6)
Restructuring charge 0 (0.1)
Impairment of Octane Additives segment goodwill (0.3) (0.3)
Total operating expenses (41.6) (32.8)
Operating income 22.2 31.2
Other net income/(expense) 1.0 1.1
Interest expense (0.4) (0.4)
Interest income 0.1 0.1
Income before income taxes 22.9 32.0
Income taxes (4.9) (7.4)
Net income $ 18.0 $ 24.6
Earnings per share:    
Basic $ 0.77 $ 1.07
Diluted $ 0.75 $ 1.03
Weighted average shares outstanding (in thousands):    
Basic 23,404 23,055
Diluted 24,015 23,823