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Stock Based Compensation Plans (Omnibus Incentive Plan, Stock Option, Restricted Stock and Deferred Stock Units Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Jan. 31, 2019
Apr. 30, 2020
Apr. 30, 2019
Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total income tax benefits recognized for stock-based compensation arrangements $ 5,200,000 $ 5,100,000   $ 12,600,000 $ 10,300,000  
Restricted Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options 174,200,000     174,200,000    
Omnibus Incentive Plan 2013 [Member] | Deferred Stock Units [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total liability attributable to deferred stock units included as a component of accrued compensation 2,100,000     $ 2,100,000   $ 1,700,000
Deferred stock units issued to non-employee Directors pursuant to the Omnibus Incentive 2013 Plan       19,300    
Cash paid to settle deferred stock unit award liabilities     $ 500,000 $ 0    
Parametric Phantom Incentive Plans [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 100,000     $ 100,000    
Weighted-average period over which compensation cost related to unvested phantom incentive units is expected to be recognized (in years)       3 years 8 months 12 days