Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 839.6	$ 753.2	$ 713.9
Cost of sales	673.1	597.4	562.7
Gross margin	166.5	155.8	151.2
Operating expenses	167.5	155.7	128.5
Gain on disposal of capital assets	(0.1)
Operating income (loss)	(0.9)	0.1	22.7
Interest expense, net	6.5	3.1	2.2
Income (loss) from continuing operations before income taxes	(7.4)	(3.0)	20.5
Provision for (benefit from) income taxes	(1.4)	3.2	7.2
Net income (loss) from continuing operations	(6.0)	(6.2)	13.3
Net income (loss) from discontinued operations, net of taxes of ($0.1), ($0.6) and $1.8, respectively	(0.4)	(0.9)	3.0
Net income (loss)	$ (6.4)	$ (7.1)	$ 16.3
Net income (loss) from continuing operations per share - basic and diluted	$ (0.24)	$ (0.25)	$ 0.52
Net income (loss) from discontinued operations per share - basic and diluted	(0.02)	(0.04)	0.12
Net income (loss) per share - basic and diluted	$ (0.26)	$ (0.29)	$ 0.64
Weighted average shares outstanding:
Basic and diluted shares outstanding	25.1	24.9	24.5