Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 360.7	$ 294.3
Cost of goods sold	(256.2)	(203.4)
Gross profit	104.5	90.9
Operating expenses:
Selling, general and administrative	(67.3)	(56.4)
Research and development	(8.3)	(7.4)
Foreign exchange loss on liquidation of subsidiary	0.0	(1.8)
Total operating expenses	(75.6)	(65.6)
Operating income	28.9	25.3
Other income, net	2.5	0.1
Interest expense, net	(1.7)	(2.2)
Income before income taxes	29.7	23.2
Income taxes	(7.5)	(6.0)
Net income	$ 22.2	$ 17.2
Earnings per share:
Basic	$ 0.91	$ 0.71
Diluted	$ 0.90	$ 0.70
Weighted average shares outstanding (in thousands):
Basic	24,369	24,087
Diluted	24,574	24,527