Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 197.9	$ 175.1	$ 356.7	$ 322.5
Cost of sales	155.7	139.5	282.5	258.4
Gross margin	42.2	35.6	74.2	64.1
Operating expenses	32.2	30.0	61.1	57.9
Gain on disposal of assets		(0.4)		(0.4)
Operating income	10.0	6.0	13.1	6.6
Interest expense, net	0.6	0.6	1.1	1.1
Income from continuing operations before income taxes	9.4	5.4	12.0	5.5
Income tax expense	3.5		4.6
Income from continuing operations	5.9	5.4	7.4	5.5
Income (loss) from discontinued operations, net of taxes	4.5	(0.3)	4.4	(0.4)
Net income	$ 10.4	$ 5.1	$ 11.8	$ 5.1
Income from continuing operations per share - basic and diluted	$ 0.23	$ 0.21	$ 0.29	$ 0.22
Income (loss) from discontinued operations per share - basic and diluted	0.18	(0.01)	0.17	(0.02)
Net income per share - basic and diluted	$ 0.41	$ 0.20	$ 0.47	$ 0.20
Weighted average shares outstanding:
Basic and diluted shares outstanding	24.5	24.1	24.5	24.0