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Acquisitions (Details) - USD ($)
$ in Millions
Dec. 01, 2015
May 01, 2015
Jul. 31, 2016
Oct. 31, 2015
Business Acquisition [Line Items]        
Goodwill     $ 910.6 $ 867.5
Westway Services Holdings        
Business Acquisition [Line Items]        
Payments to acquire businesses, gross $ 81.0      
Goodwill 50.0      
Intangible assets, other than goodwill $ 22.2      
CTS Services/Facility Support Services        
Business Acquisition [Line Items]        
Payments to acquire businesses, gross   $ 18.8    
Contingent consideration liability   $ 3.8