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Stock-based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
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   $ 16.15 $ 18.90  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 1.0 $ 2.0 $ 3.0  
Stock-based compensation 11.0 17.0 17.0  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 5.0      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year      
Proceeds from exercise of stock options $ 4.0 4.0 $ 8.0  
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 28,833      
Share-based Payment Arrangement, 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 0 5,000 4,000  
Equity Instruments Other than Options, Vested in Period 0 5,000 4,000  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0 $ 32.30 $ 34.97  
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 $ 11.0 $ 8.0 $ 7.0  
Performance-based Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity Instruments Other than Options, Vested in Period (42,000) (29,000) (13,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Exercisable, Number 81,000 123,000 152,000  
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 28,500      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
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 0 226,000 187,000  
Equity Instruments Other than Options, Vested in Period 188,000 230,000 319,000  
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0 $ 34.97 $ 40.12  
Share-based Payment Arrangement, Cash Used to Settle Award $ 7.0 $ 8.0 $ 13.0  
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   3,949,512    
Stock Options Granted Prior to December 2009 [Member] | Share-based Payment Arrangement, 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] | Share-based Payment Arrangement, 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