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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Net sales $ 1,306.8 $ 883.4 $ 1,012.3
Cost of goods sold (903.5) (551.1) (666.3)
Gross profit 403.3 332.3 346.0
Operating expenses:      
Selling, general and administrative (239.5) (209.5) (206.7)
Research and development (31.4) (25.4) (25.3)
Adjustment to fair value of contingent consideration 0.0 9.4 40.7
(Loss)/profit on disposal of subsidiary (0.9) (1.4) 1.6
Foreign exchange loss on liquidation of subsidiary (1.8) 0.0 0.0
Total operating expenses (273.6) (226.9) (189.7)
Operating income 129.7 105.4 156.3
Other income/(expense), net 6.6 0.9 0.0
Interest expense, net (8.2) (3.2) (4.0)
Income before income taxes 128.1 103.1 152.3
Income taxes (66.3) (21.8) (32.8)
Net income $ 61.8 $ 81.3 $ 119.5
Earnings per share:      
Basic $ 2.56 $ 3.39 $ 4.96
Diluted $ 2.52 $ 3.33 $ 4.86
Weighted average shares outstanding (in thousands):      
Basic 24,148 23,998 24,107
Diluted 24,486 24,442 24,612
Dividend declared per common share $ 0.77 $ 0.67 $ 0.61