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Held For Sale - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2017
Oct. 31, 2016
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
May 31, 2017
Additional Disclosures by Disposal Groups            
Impairment recovery $ 17.4   $ 0.0 $ 17.4 $ 0.0  
Disposal Group, Held-for-sale, Not Discontinued Operations | Government Services            
Additional Disclosures by Disposal Groups            
Write-down of goodwill and long-lived assets   $ 22.5        
Offer from strategic buyer for sale of business 35.0          
Impairment recovery 17.4          
Trade accounts receivable, net 25.9 23.8   25.9    
Trade accounts payable $ 11.8 11.8   $ 11.8    
Disposal Group, Held-for-sale, Not Discontinued Operations | Government Services | Reclassification adjustment            
Additional Disclosures by Disposal Groups            
Trade accounts receivable, net   (8.1)        
Trade accounts payable   $ (2.6)        
Disposal Group, Held-for-sale, Not Discontinued Operations | Government Services | Subsequent Event            
Additional Disclosures by Disposal Groups            
Sale of Government Services business, consideration           $ 35.5