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Consolidated Statements Of Income (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements Of Income [Abstract]    
Net sales $ 200.8 $ 185.3
Cost of goods sold (136.8) (132.5)
Gross profit 64.0 52.8
Operating expenses:    
Selling, general and administrative (27.8) (24.0)
Research and development (4.6) (4.3)
Restructuring charge (0.1) 0
Impairment of Octane Additives segment goodwill (0.3) (0.6)
Total operating expenses (32.8) (28.9)
Operating income 31.2 23.9
Other net income 1.1 5.3
Interest expense (0.4) (1.0)
Interest income 0.1 0.1
Income before income taxes 32.0 28.3
Income taxes (7.4) (6.8)
Net income $ 24.6 $ 21.5
Earnings per share:    
Basic $ 1.07 $ 0.91
Diluted $ 1.03 $ 0.88
Weighted average shares outstanding (in thousands):    
Basic 23,055 23,655
Diluted 23,823 24,461