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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Net sales $ 1,513.3 $ 1,476.9 $ 1,306.8
Cost of goods sold (1,047.1) (1,041.9) (903.5)
Gross profit 466.2 435.0 403.3
Operating expenses:      
Selling, general and administrative (280.9) (261.0) (244.2)
Research and development (35.4) (33.4) (31.4)
Restructuring charge (0.0) (7.1) (0.0)
Loss on disposal of subsidiary 0.0 0.0 (0.9)
Foreign exchange loss on liquidation of subsidiary 0.0 0.0 (1.8)
Total operating expenses (316.3) (301.5) (278.3)
Operating income 149.9 133.5 125.0
Other income, net 5.3 5.0 11.3
Interest expense, net (4.8) (6.9) (8.2)
Income before income tax expense 150.4 131.6 128.1
Income tax expense (38.2) (46.6) (66.3)
Net income $ 112.2 $ 85.0 $ 61.8
Earnings per share:      
Basic $ 4.58 $ 3.48 $ 2.56
Diluted $ 4.54 $ 3.45 $ 2.52
Weighted average shares outstanding (in thousands):      
Basic 24,482 24,401 24,148
Diluted 24,728 24,603 24,486