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Consolidated Statements of Income (Unaudited) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Consolidated Statements of Income [Abstract]        
Net sales $ 183.4 $ 202.1 $ 562.7 $ 573.9
Cost of goods sold (132.7) (144.4) (391.3) (405.3)
Gross profit 50.7 57.7 171.4 168.6
Operating expenses:        
Selling, general and administrative (28.3) (72.6) (83.4) (127.1)
Research and development (4.8) (4.7) (14.4) (13.7)
Restructuring charge (0.1) 0 (0.2) 0
Impairment of Octane Additives segment goodwill (0.3) (0.6) (0.9) (1.7)
Profit on disposal 0.1 0 0.1 0
Total operating expenses (33.4) (77.9) (98.8) (142.5)
Operating income/(loss) 17.3 (20.2) 72.6 26.1
Other net (expense)/income (0.1) (4.3) (3.3) 8.9
Interest expense (0.4) (0.8) (1.3) (2.8)
Interest income 0.2 0.1 0.5 0.4
Income/(loss) before income taxes 17.0 (25.2) 68.5 32.6
Income taxes (1.5) 8.4 (12.9) (3.3)
Net income/(loss) $ 15.5 $ (16.8) $ 55.6 $ 29.3
Earnings/(loss) per share:        
Basic $ 0.67 $ (0.71) $ 2.40 $ 1.24
Diluted $ 0.65 $ (0.71) $ 2.33 $ 1.19
Weighted average shares outstanding (in thousands):        
Basic 23,240 23,711 23,148 23,698
Diluted 23,923 23,711 23,872 24,616