Restructuring (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Reserve [Roll Forward]
Beginning balance	$ 0.2	$ 1.0	$ 0.0	$ 0.3	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Charge to expense	0.4	0.0	1.2	0.0	0.4	0.0	1.6	0.4
Cash payments	(0.2)	(0.8)	(0.2)	(0.2)	(0.1)	0.0
Ending balance	0.4	$ 0.2	$ 1.0	0.1	$ 0.3	$ 0.0	0.4	0.1
Operating Segments | Safety & Security Systems | Voluntary Reduction-In-Force Plan
Restructuring Cost and Reserve [Line Items]
Severance costs				$ 0.4			1.6	$ 0.4
Operating Segments | Safety & Security Systems | Cost Reduction Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	0.4
Expected additional restructuring charges	$ 1.5						$ 1.5