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Share-Based Compensation Plans - RSU Narrative (Details) - RSUs - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable rate 50.00%    
Vesting period 3 years    
Total unrecognized compensation cost, net of estimated forfeitures $ 16.7    
Weighted-average vesting period 2 years 9 months    
Fair value per share of awards granted (usd per share) $ 35.62 $ 29.31 $ 27.82
Total fair value of RSUs vested $ 7.2 $ 9.4 $ 5.4