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SPECIAL ITEMS - Impairments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 31, 2016
Oct. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Asset Impairment              
Non-cash charge for impairment of long-lived assets, pretax         $ 85.1 $ 34.8 $ 95.9
Water Operations | Disposal Group              
Asset Impairment              
Non-cash charge for impairment of long-lived assets, pretax             62.0
Non-cash charge for impairment of long-lived assets, after-tax             $ 30.0
Water Operations | Cost of Sales | Disposal Group              
Asset Impairment              
Non-cash charge for impairment of long-lived assets, pretax       $ 26.0      
Non-cash charge for impairment of long-lived assets, after-tax       $ 26.0      
Water Operations | Other Operating Expense | Disposal Group              
Asset Impairment              
Non-cash charge for impairment of long-lived assets, pretax     $ 36.0        
Non-cash charge for impairment of long-lived assets, after-tax     $ 4.0        
Construction and Forestry              
Asset Impairment              
Non-cash charge for impairment of investments in unconsolidated affiliates, pretax $ 12.0            
Non-cash charge for impairment of investments in unconsolidated affiliates, after-tax 12.0            
Construction and Forestry | Cost of Sales              
Asset Impairment              
Non-cash charge for impairment of long-lived assets, pretax 13.0            
Non-cash charge for impairment of long-lived assets, after-tax $ 13.0            
Financial Services | Other Operating Expense              
Asset Impairment              
Non-cash charge for impairment of equipment on operating leases, pretax         31.0    
Non-cash charge for impairment of other assets, pretax         $ 29.0    
Agriculture and Turf | Cost of Sales              
Asset Impairment              
Non-cash charge for impairment of long-lived assets, pretax   $ 18.0          
Non-cash charge for impairment of long-lived assets, after-tax   18.0          
Non-cash charge for impairment of other assets, pretax   16.0          
Non-cash charge for impairment of other assets, after-tax   $ 16.0