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Selected Quarterly Data - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2012 2012 Plan	Mar. 31, 2012 2012 Plan	Dec. 31, 2013 Safety And Security Systems 2013 Plan
Effect of Fourth Quarter Events [Line Items]
Debt agreement termination costs			$ 8.7	$ 1.9	$ 1.6
Release of valuation allowance		(102.4)
Released restructuring cost		(0.6)
Decrease in valuation allowance	(6.7)
Severance costs						$ 0.6	$ 0.9	$ 1.2

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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