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Summary of Quarterly Results of Operations (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]
Write off of Deferred Debt Issuance Cost					$ 0.3					$ 0.3	$ 0.0	$ 0.0
Effective Income Tax Rate Reconciliation, Tax Planning Adjustments, Amount						$ 4.2					(4.2)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 0.2	$ 0.4	$ 0.4		0.5	2.4					2.4
Net sales	176.1	186.7	172.3		172.8	186.4	$ 179.7	$ 205.4	$ 196.5	707.9	768.0	779.1
Gross profit	45.4	45.3	45.0		47.4	55.3	54.7	60.7	54.9	183.1	225.6	208.7
Income from continuing operations	12.1	7.5	9.4	[1]	10.4	17.4	15.8	18.2	14.4	39.4	65.8	59.7
Gain (loss) from discontinued operations and disposal, net of tax	0.5	1.0	(0.3)		3.2	(5.9)	3.0	0.1	0.5	4.4	(2.3)	4.0
Net income	$ 12.6	$ 8.5	$ 9.1		$ 13.6	$ 11.5	$ 18.8	$ 18.3	$ 14.9	$ 43.8	$ 63.5	$ 63.7
Earnings from continuing operations (usd per share)	$ 0.20	$ 0.12	$ 0.15		$ 0.17	$ 0.27	$ 0.25	$ 0.29	$ 0.22	$ 0.64	$ 1.04	$ 0.94
Earnings (loss) from discontinued operations (usd per share)	0.01	0.02	0.00		0.05	(0.09)	0.05	0.00	0.01	0.07	(0.04)	0.06
Net earnings per share (usd per share)	$ 0.21	$ 0.14	$ 0.15		$ 0.22	$ 0.18	$ 0.30	$ 0.29	$ 0.23	$ 0.71	$ 1.00	$ 1.00
Restructuring Charges	$ 0.1	$ 0.3			$ 1.2			$ 0.4		$ 1.7	$ 0.4	$ 0.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount						$ 0.4					$ 0.4	$ 0.4
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