Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 753.2	$ 713.9	$ 659.6
Cost of sales	597.4	562.7	526.3
Gross margin	155.8	151.2	133.3
Operating expenses	155.7	128.5	119.2
Gain on disposal of capital assets			(0.4)
Operating income	0.1	22.7	14.5
Interest expense, net	3.1	2.2	2.3
(Loss) income from continuing operations before income taxes	(3.0)	20.5	12.2
Provision for (benefit from) income taxes	3.2	7.2	(17.2)
Net (loss) income from continuing operations	(6.2)	13.3	29.4
Net (loss) income from discontinued operations, net of taxes of ($0.6), $1.8 and ($1.9), respectively	(0.9)	3.0	(3.4)
Net (loss) income	$ (7.1)	$ 16.3	$ 26.0
Net (loss) income from continuing operations per share - basic and diluted	$ (0.25)	$ 0.52	$ 1.17
Net (loss) income from discontinued operations per share - basic and diluted	(0.04)	0.12	(0.14)
Net (loss) income per share - basic and diluted	$ (0.29)	$ 0.64	$ 1.04
Weighted average shares outstanding:
Basic and diluted shares outstanding	24.9	24.5	24.1