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Consolidated Statements of Income (Unaudited) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Consolidated Statements of Income [Abstract]        
Net sales $ 178.5 $ 186.5 $ 379.3 $ 371.8
Cost of goods sold (121.8) (128.4) (258.6) (260.9)
Gross profit 56.7 58.1 120.7 110.9
Operating expenses:        
Selling, general and administrative (27.3) (30.5) (55.1) (54.5)
Research and development (5.0) (4.7) (9.6) (9.0)
Restructuring charge 0 0 (0.1) 0
Impairment of Octane Additives segment goodwill (0.3) (0.5) (0.6) (1.1)
Total operating expenses (32.6) (35.7) (65.4) (64.6)
Operating income 24.1 22.4 55.3 46.3
Other net (expense)/income (4.3) 7.9 (3.2) 13.2
Interest expense (0.5) (1.0) (0.9) (2.0)
Interest income 0.2 0.2 0.3 0.3
Income before income taxes 19.5 29.5 51.5 57.8
Income taxes (4.0) (4.9) (11.4) (11.7)
Net income $ 15.5 $ 24.6 $ 40.1 $ 46.1
Earnings per share:        
Basic $ 0.67 $ 1.04 $ 1.74 $ 1.95
Diluted $ 0.65 $ 1.00 $ 1.68 $ 1.88
Weighted average shares outstanding (in thousands):        
Basic 23,147 23,726 23,101 23,691
Diluted 23,894 24,519 23,820 24,523