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Consolidated Statements of Income (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Income [Abstract]      
Net sales $ 776.4 $ 774.4 $ 683.2
Cost of goods sold (540.0) (548.0) (469.1)
Gross profit 236.4 226.4 214.1
Operating expenses:      
Selling, general and administrative (117.1) (155.9) (113.5)
Research and development (19.6) (18.3) (17.6)
Restructuring charge (0.2) (0.6) (8.7)
Impairment of Octane Additives segment goodwill (1.2) (2.0) (2.2)
Profit on disposal, net 0.1 0 0.1
Total operating expenses (138.0) (176.8) (141.9)
Operating income 98.4 49.6 72.2
Other net income/(expense) (2.0) 6.3 3.1
Interest expense (1.8) (3.9) (5.1)
Interest income 0.6 0.6 0.5
Income before income taxes 95.2 52.6 70.7
Income taxes (26.9) (3.7) 3.0
Net income $ 68.3 $ 48.9 $ 73.7
Earnings per share:      
Basic $ 2.95 $ 2.07 $ 3.10
Diluted $ 2.86 $ 1.99 $ 2.97
Weighted average shares outstanding (in thousands):      
Basic 23,187 23,568 23,756
Diluted 23,850 24,520 24,814
Dividend declared per common share $ 2.00 $ 0.00 $ 0.00