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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Net sales $ 1,476.9 $ 1,306.8 $ 883.4
Cost of goods sold (1,041.9) (903.5) (551.1)
Gross profit 435.0 403.3 332.3
Operating expenses:      
Selling, general and administrative (261.0) (244.2) (216.7)
Research and development (33.4) (31.4) (25.4)
Restructuring charge (7.1) 0.0 0.0
Adjustment to fair value of contingent consideration 0.0 0.0 9.4
Loss on disposal of subsidiary 0.0 (0.9) (1.4)
Foreign exchange loss on liquidation of subsidiary 0.0 (1.8) 0.0
Total operating expenses (301.5) (278.3) (234.1)
Operating income 133.5 125.0 98.2
Other income, net 5.0 11.3 8.1
Interest expense, net (6.9) (8.2) (3.2)
Income before income tax expense 131.6 128.1 103.1
Income tax expense (46.6) (66.3) (21.8)
Net income $ 85.0 $ 61.8 $ 81.3
Earnings per share:      
Basic $ 3.48 $ 2.56 $ 3.39
Diluted $ 3.45 $ 2.52 $ 3.33
Weighted average shares outstanding (in thousands):      
Basic 24,401 24,148 23,998
Diluted 24,603 24,486 24,442
Dividend declared per common share $ 0.89 $ 0.77 $ 0.67