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Consolidated Statements of Income (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Net sales $ 818.8 $ 776.4 $ 774.4
Cost of goods sold (563.6) (540.0) (548.0)
Gross profit 255.2 236.4 226.4
Operating expenses:      
Selling, general and administrative (141.9) (119.0) (158.3)
Research and development (21.2) (19.6) (18.3)
Restructuring charge (0.2) (0.2) (0.6)
Impairment of Octane Additives segment goodwill (1.3) (1.2) (2.0)
Profit on disposal, net 0 0.1 0
Total operating expenses (164.6) (139.9) (179.2)
Operating income 90.6 96.5 47.2
Other net income/(expense) 4.1 (2.0) 6.3
Interest expense (2.3) (1.8) (3.9)
Interest income 0.4 0.6 0.6
Income before income taxes 92.8 93.3 50.2
Income taxes (15.0) (26.4) (3.1)
Net income $ 77.8 $ 66.9 $ 47.1
Earnings per share:      
Basic $ 3.29 $ 2.89 $ 2.00
Diluted $ 3.22 $ 2.81 $ 1.92
Weighted average shares outstanding (in thousands):      
Basic 23,651 23,187 23,568
Diluted 24,156 23,850 24,520
Dividend declared per common share $ 0.50 $ 2.00 $ 0.00