Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 713.9	$ 659.6	$ 623.7
Cost of sales	562.7	526.3	501.1
Gross margin	151.2	133.3	122.6
Operating expenses	128.5	119.2	114.3
Gain on disposal of assets		(0.4)
Operating income	22.7	14.5	8.3
Interest expense, net	2.2	2.3	2.5
Income from continuing operations before income taxes	20.5	12.2	5.8
Provision (benefit) for income taxes	7.2	(17.2)
Net income from continuing operations	13.3	29.4	5.8
Net income (loss) from discontinued operations, net of taxes of $1.8, ($1.9) and $0.0, respectively	3.0	(3.4)	(3.6)
Net income	$ 16.3	$ 26.0	$ 2.2
Net income from continuing operations per share - basic and diluted	$ 0.52	$ 1.17	$ 0.23
Net income (loss) from discontinued operations per share - basic and diluted	0.12	(0.14)	(0.15)
Net income per share - basic and diluted	$ 0.64	$ 1.04	$ 0.09
Weighted average shares outstanding:
Basic and diluted shares outstanding	24.5	24.1	23.5