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Stock-based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected Dividend Rate 0.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 13.61 $ 5.15 $ 13.70    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 3.0 $ 0.0 $ 0.0    
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 10.53    
Stock-based compensation 25.0 15.0 $ 9.0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 20.0        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year        
Proceeds from exercise of stock options $ 12.0 0.0 1.0    
Deferred Share Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding Number 2,365        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number Of Common Stock Delivered 1        
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Delivery Period of Shares 10 days        
Deferred Fee Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding Number 50,609        
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Aggregate Grant Date Fair Value $ 0.1 $ 0.1 $ 1.1    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Equity Instruments Other than Options, Grants in Period 5,000 5,000 2,000    
Equity Instruments Other than Options, Vested in Period 5,000 5,000 43,000    
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 24.62 $ 12.52 $ 29.50    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Aggregate Grant Date Fair Value $ 9.0 $ 8.0 $ 10.0    
Performance-based Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity Instruments Other than Options, Grants in Period 0 0 729,000    
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.00 $ 0.00 $ 27.61    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Exercisable, Number 0   0 0  
Premium Share Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding Number 29,712        
Cash-Settled Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity Instruments Other than Options, Grants in Period 258,000 650,000 280,000    
Equity Instruments Other than Options, Vested in Period 456,000 231,000 190,000    
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 27.48 $ 7.26 $ 27.67    
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards $ 13.0 $ 2.0 $ 6.0    
Plan 2013 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         3,665,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,344,455        
Stock Options Granted Prior to December 2009 [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years        
Stock Options Granted After December 2009 [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 7 years