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Goodwill Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]      
Goodwill $ 236.5 $ 231.6 $ 235.2
Goodwill, Acquired During Period 7.1    
Goodwill, Foreign Currency Translation Gain (Loss) (2.2) (3.6)  
Environmental Solutions [Member]      
Goodwill [Line Items]      
Goodwill 127.2 120.4 120.4
Goodwill, Acquired During Period 7.1    
Goodwill, Foreign Currency Translation Gain (Loss) (0.3) 0.0  
Safety And Security Systems [Member]      
Goodwill [Line Items]      
Goodwill 109.3 111.2 $ 114.8
Goodwill, Acquired During Period 0.0    
Goodwill, Foreign Currency Translation Gain (Loss) $ (1.9) $ (3.6)