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Consolidated Statements Of Income (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Consolidated Statements Of Income        
Net sales $ 186.5 $ 168.4 $ 371.8 $ 331.9
Cost of goods sold (128.4) (114.4) (260.9) (226.5)
Gross profit 58.1 54.0 110.9 105.4
Operating expenses:        
Selling, general and administrative (30.5) (24.1) (54.5) (51.4)
Research and development (4.7) (4.5) (9.0) (8.5)
Restructuring charge 0 (0.3) 0 (8.5)
Impairment of Octane Additives segment goodwill (0.5) (0.5) (1.1) (1.1)
Profit on disposal 0 0.2 0 0.2
Total operating expenses (35.7) (29.2) (64.6) (69.3)
Operating income 22.4 24.8 46.3 36.1
Other net income/(expense) 7.9 (10.8) 13.2 (10.9)
Interest expense (1.0) (1.2) (2.0) (2.5)
Interest income 0.2 0.1 0.3 0.2
Income before income taxes 29.5 12.9 57.8 22.9
Income taxes (4.9) (0.9) (11.7) (3.5)
Net income $ 24.6 $ 12.0 $ 46.1 $ 19.4
Earnings per share:        
Basic $ 1.04 $ 0.50 $ 1.95 $ 0.82
Diluted $ 1.00 $ 0.48 $ 1.88 $ 0.78
Weighted average shares outstanding (in thousands):        
Basic 23,726 23,781 23,691 23,732
Diluted 24,519 25,005 24,523 24,915