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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Sep. 30, 2014 Employee Severance	Jun. 30, 2014 Employee Severance	Mar. 31, 2014 Employee Severance	Dec. 31, 2013 Safety And Security Systems Two Thousand and Thirteen Restructuring Plan [Member]	Dec. 31, 2013 Corporate, Non-Segment [Member] Two Thousand and Thirteen Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs					$ 1.2	$ 0.3
Adjustments		0.1	0.1	(0.2)
Released of Restructuring Costs	$ 0.6

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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