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Summary of Restructuring Charges by Segment and Total Charges Estimated to be Incurred (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Pre-Tax Restructuring Charges	$ 1.4	$ 4.4
Environmental Solutions
Restructuring Cost and Reserve [Line Items]
Pre-Tax Restructuring Charges		0.8
Safety And Security Systems
Restructuring Cost and Reserve [Line Items]
Pre-Tax Restructuring Charges		1.8
Fire Rescue
Restructuring Cost and Reserve [Line Items]
Pre-Tax Restructuring Charges		0.6
Corporate
Restructuring Cost and Reserve [Line Items]
Pre-Tax Restructuring Charges		$ 1.2

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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