Selected Quarterly Financial Data - Summary of Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 164.4	$ 192.8	$ 197.9	$ 158.8	$ 155.4	$ 181.7	$ 175.1	$ 147.4	$ 713.9	$ 659.6	$ 623.7
Gross margin	35.6	41.4	42.2	32.0	32.0	37.2	35.6	28.5	151.2	133.3	122.6
Operating expenses	33.8	33.6	32.2	28.9	30.5	30.8	30.0	27.9	128.5	119.2	114.3
Operating income	1.8	7.8	10.0	3.1	1.5	6.4	6.0	0.6	22.7	14.5	8.3
Net income from continuing operations	1.1	4.8	5.9	1.5	0.7	23.2	5.4	0.1	13.3	29.4	5.8
Net (loss) income from discontinued operations	$ (1.3)	$ (0.1)	$ 4.5	$ (0.1)	$ (0.3)	$ (2.7)	$ (0.3)	$ (0.1)	$ 3.0	$ (3.4)	$ (3.6)
Net income from continuing operations	$ 0.04	$ 0.19	$ 0.23	$ 0.06	$ 0.03	$ 0.92	$ 0.21		$ 0.52	$ 1.17	$ 0.23
Net income (loss) from discontinued operations	(0.05)		0.18		(0.01)	(0.11)	(0.01)		0.12	(0.14)	(0.15)
Net income	$ (0.01)	$ 0.19	$ 0.41	$ 0.06	$ 0.02	$ 0.82	$ 0.20		$ 0.64	$ 1.04	$ 0.09