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Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Dec. 01, 2015
May 01, 2015
Oct. 31, 2014
Oct. 31, 2016
Oct. 31, 2015
Business Acquisition [Line Items]            
Business acquisition aggregate purchase price       $ 52.9    
Goodwill       854.7 $ 912.8 $ 867.5
Contingent consideration       $ 3.3    
Contingent consideration, payable         $ 1.7  
8 Solutions Ltd            
Business Acquisition [Line Items]            
Business acquisition aggregate purchase price $ 16.1          
Westway Services Holdings            
Business Acquisition [Line Items]            
Business acquisition aggregate purchase price   $ 81.0        
Goodwill   54.2        
Other intangible assets   $ 22.5        
CTS Services/Facility Support Services            
Business Acquisition [Line Items]            
Business acquisition aggregate purchase price     $ 18.8      
Contingent consideration liability     $ 3.8