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Stock-based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 31, 2018
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 $ 18.90 $ 13.61 $ 5.15      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 3.0 $ 3.0 $ 0.0      
Stock-based compensation 17.0 25.0 15.0      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 14.0          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year          
Proceeds from exercise of stock options $ 8.0 $ 12.0 $ 0.0      
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 19,491          
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          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years          
Equity Instruments Other than Options, Grants in Period 4,000 5,000 5,000      
Equity Instruments Other than Options, Vested in Period 4,000 5,000 5,000      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 34.97 $ 24.62 $ 12.52      
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   $ 7.0 $ 9.0 $ 8.0    
Performance-based Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity Instruments Other than Options, Grants in Period 13,000 0 0      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 27.67 $ 0.00 $ 0.00      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Exercisable, Number 151,968,000     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 187,000 258,000 650,000      
Equity Instruments Other than Options, Vested in Period 319,000 456,000 231,000      
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 40.12 $ 27.48 $ 7.26      
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards $ 13.0 $ 13.0 $ 2.0      
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 3,142,917          
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