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Restructuring (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Reserve [Roll Forward]    
Beginning balance $ 0.4 $ 0.0
Charge to expense 0.3 1.2
Cash payments (0.2) (0.2)
Ending balance 0.5 1.0
Operating Segments | Safety & Security Systems | Voluntary Reduction-In-Force Plan    
Restructuring Cost and Reserve [Line Items]    
Severance costs $ 1.2
Restructuring Reserve [Roll Forward]    
Charge to expense $ 0.3