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Consolidated Statements of Income (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Net sales $ 220.7 $ 199.4
Cost of goods sold (155.0) (135.6)
Gross profit 65.7 63.8
Operating expenses:    
Selling, general and administrative (41.8) (35.7)
Research and development (5.7) (5.6)
Restructuring charge (0.2) 0
Impairment of Octane Additives segment goodwill 0 (0.3)
Total operating expenses (47.7) (41.6)
Operating income 18.0 22.2
Other net income/(expense) 1.9 1.0
Interest expense (1.0) (0.4)
Interest income 0.1 0.1
Income before income taxes 19.0 22.9
Income taxes (2.1) (4.9)
Net income $ 16.9 $ 18.0
Earnings per share:    
Basic $ 0.69 $ 0.77
Diluted $ 0.69 $ 0.75
Weighted average shares outstanding (in thousands):    
Basic 24,362 23,404
Diluted 24,635 24,015