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Share-Based Compensation Plans - RSU Activity (Details) - RSUs - $ / shares
shares in Millions
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Number of Shares      
Beginning balance (in shares) 1.0    
Granted (in shares) 0.4    
Vested (in shares) (0.4)    
Forfeited (in shares) (0.1)    
Ending balance (in shares) 0.9 1.0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Beginning balance (usd per share) $ 28.83    
Granted (usd per share) 41.79 $ 35.62 $ 29.31
Vested (usd per share) 26.45    
Forfeited (usd per share) 31.29    
Ending balance (usd per share) $ 34.18 $ 28.83  
Shares withheld for income taxes (in shares) 0.1