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Restructuring (Details) - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.1	$ 0.1	$ 0.1	$ 0.3	$ 0.1	$ 0.4	$ 1.2	$ 0.6	$ 1.7	$ 0.4
Payments for restructuring								(0.7)	(1.3)
Severance costs				$ 0.7
Restructuring Reserve	$ 0.3				$ 0.4			0.3	0.4	$ 0.0
Operating Segments | Safety And Security Systems | Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges								$ 0.6
Operating Segments | Safety And Security Systems | Voluntary Reduction-In-Force Plan
Restructuring Cost and Reserve [Line Items]
Severance costs									$ 1.7

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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+ References

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