Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 291.0	$ 224.4	$ 540.7	$ 402.2
Cost of sales	211.8	169.7	399.6	303.9
Gross profit	79.2	54.7	141.1	98.3
Selling, engineering, general and administrative expenses	40.7	34.8	82.5	66.2
Acquisition and integration-related expenses	0.4	1.0	0.9	1.5
Restructuring	0.0	0.1	0.0	0.4
Operating income	38.1	18.8	57.7	30.2
Interest expense	2.5	1.3	5.0	1.9
Other expense (income), net	0.4	(0.1)	0.5	(0.3)
Income before income taxes	35.2	17.6	52.2	28.6
Income tax expense	8.3	6.1	12.4	9.9
Income from continuing operations	26.9	11.5	39.8	18.7
Loss from discontinued operations and disposal, net of income tax	0.0	(0.1)	0.0	0.0
Net income	$ 26.9	$ 11.4	$ 39.8	$ 18.7
Basic earnings per share:
Earnings from continuing operations (usd per share)	$ 0.45	$ 0.19	$ 0.67	$ 0.31
Loss from discontinued operations and disposal, net of tax (usd per share)	0.00	0.00	0.00	0.00
Net earnings per share (usd per share)	0.45	0.19	0.67	0.31
Diluted earnings per share:
Earnings from continuing operations (usd per share)	0.44	0.19	0.65	0.31
Loss from discontinued operations and disposal, net of tax (usd per share)	0.00	0.00	0.00	0.00
Net earnings per share (usd per share)	$ 0.44	$ 0.19	$ 0.65	$ 0.31
Weighted average common shares outstanding:
Basic (shares)	59.9	59.7	59.9	59.7
Diluted (shares)	61.0	60.3	60.9	60.3
Cash dividends declared per common share (usd per share)	$ 0.08	$ 0.07	$ 0.15	$ 0.14