Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 249.7	$ 177.8
Cost of sales	187.8	134.2
Gross profit	61.9	43.6
Selling, engineering, general and administrative expenses	41.8	31.4
Acquisition and integration-related expenses	0.5	0.5
Restructuring	0.0	0.3
Operating income	19.6	11.4
Interest expense	2.5	0.6
Other expense (income), net	0.1	(0.2)
Income before income taxes	17.0	11.0
Income tax expense	4.1	3.8
Income from continuing operations	12.9	7.2
Gain from discontinued operations and disposal, net of income tax expense of $0.0 and $0.1, respectively	0.0	0.1
Net income	$ 12.9	$ 7.3
Basic earnings per share:
Earnings from continuing operations (usd per share)	$ 0.22	$ 0.12
Earnings from discontinued operations and disposal, net of tax (usd per share)	0.00	0.00
Net earnings per share (usd per share)	0.22	0.12
Diluted earnings per share:
Earnings from continuing operations (usd per share)	0.21	0.12
Earnings from discontinued operations and disposal, net of tax (usd per share)	0.00	0.00
Net earnings per share (usd per share)	$ 0.21	$ 0.12
Weighted average common shares outstanding:
Basic (shares)	59.8	59.6
Diluted (shares)	60.8	60.3
Cash dividends declared per common share (usd per share)	$ 0.07	$ 0.07