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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.1	$ 0.1	$ 0.1	$ 0.3	$ 0.0	$ 0.6	$ 1.7
Payments for restructuring					0.0	(0.7)
Severance costs				$ 0.7
Restructuring Reserve	$ 0.3				0.3	0.3	$ 0.4
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

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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.

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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.

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