Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 248.7	$ 186.7	$ 650.9	$ 531.8
Cost of sales	187.4	141.4	491.3	394.1
Gross profit	61.3	45.3	159.6	137.7
Selling, engineering, general and administrative expenses	38.3	31.1	104.7	91.0
Acquisition and integration-related expenses	0.7	0.3	2.2	1.2
Restructuring	0.1	0.4	0.5	1.6
Operating income	22.2	13.5	52.2	43.9
Interest expense	2.7	0.6	4.6	1.4
Debt settlement charges	0.0	0.0	0.0	0.3
Other income, net	(0.5)	(0.3)	(1.0)	(1.3)
Income before income taxes	20.0	13.2	48.6	43.5
Income tax expense	7.5	5.7	17.4	16.2
Income from continuing operations	12.5	7.5	31.2	27.3
Gain from discontinued operations and disposal, net of income tax (benefit) expense of $(0.0), $(1.0), $(0.0) and $3.1, respectively	0.0	1.0	0.0	3.9
Net income	$ 12.5	$ 8.5	$ 31.2	$ 31.2
Basic earnings per share:
Earnings from continuing operations (usd per share)	$ 0.21	$ 0.12	$ 0.52	$ 0.45
Earnings from discontinued operations and disposal, net of tax (usd per share)	0.00	0.02	0.00	0.06
Net earnings per share (usd per share)	0.21	0.14	0.52	0.51
Diluted earnings per share:
Earnings from continuing operations (usd per share)	0.21	0.12	0.52	0.45
Earnings from discontinued operations and disposal, net of tax (usd per share)	0.00	0.02	0.00	0.06
Net earnings per share (usd per share)	$ 0.21	$ 0.14	$ 0.52	$ 0.51
Weighted average common shares outstanding:
Basic (shares)	59.8	59.8	59.7	60.7
Diluted (shares)	60.6	60.6	60.4	61.5
Cash dividends declared per common share (usd per share)	$ 0.07	$ 0.07	$ 0.21	$ 0.21