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Stock-Based Compensation Plans (Summary of Restricted Share And Phantom Stock Unit Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Restricted Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested, beginning of period shares 4,544,000    
Granted shares 1,746,000    
Issued in connection with tender offer, shares 556,000    
Vested shares (1,346,000)    
Forfeited shares (123,000)    
Unvested, end of period shares 5,377,000 4,544,000  
Unvested, weighted-average grant date fair value, beginning of period ($ per share) $ 40.70    
Granted, weighted-average grant date fair value ($ per share) 44.87    
Issued in connection with tender offer, weighted-average grant date fair value ($ per share) 44.34    
Vested, weighted-average grant date fair value ($ per share) 39.15    
Forfeited, weighted-average grant date fair value ($ per share) 43.09    
Unvested, weighted-average grant date fair value, end of period ($ per share) $ 42.72 $ 40.70  
Fair value of restricted stock that vested during the period $ 52.7 $ 47.2 $ 40.5
Restricted shares granted in November 2019 1,500,000    
Grant date fair value of November 2019 restricted stock grants $ 46.15    
Deferred Stock Units [Member] | Atlanta Capital Phantom Incentive Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested, beginning of period shares 19,931,000    
Granted shares 19,531,000    
Vested shares (1,992,000)    
Unvested, end of period shares 37,470,000 19,931,000  
Unvested, weighted-average grant date fair value, beginning of period ($ per share) $ 142.31    
Granted, weighted-average grant date fair value ($ per share) 133.12    
Vested, weighted-average grant date fair value ($ per share) 142.31    
Unvested, weighted-average grant date fair value, end of period ($ per share) $ 137.52 $ 142.31  
Phantom Incentive Units [Member] | Parametric Phantom Incentive Plan 2016 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested, beginning of period shares 6,222,000    
Vested shares (825,000)    
Forfeited shares (248,000)    
Exchanged for restricted stock, shares (5,074,000)    
Unvested, end of period shares 75,000 6,222,000  
Unvested, weighted-average grant date fair value, beginning of period ($ per share) $ 2,010.27    
Vested, weighted-average grant date fair value ($ per share) 1,956.11    
Forfeited, weighted-average grant date fair value ($ per share) 1,991.57    
Exchanged for restricted stock,weighted-average grant date fair value ($ per share) 2,939.00    
Unvested, weighted-average grant date fair value, end of period ($ per share) $ 2,091.93 $ 2,010.27  
Phantom Incentive Units [Member] | Parametric Phantom Incentive Plan 2018 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested, beginning of period shares 1,530,000    
Granted shares 355,067,000    
Vested shares (1,034,000)    
Forfeited shares (18,780,000)    
Exchanged for restricted stock, shares (330,886,000)    
Unvested, end of period shares 5,897,000 1,530,000  
Unvested, weighted-average grant date fair value, beginning of period ($ per share) $ 22.09    
Granted, weighted-average grant date fair value ($ per share) 22.83    
Vested, weighted-average grant date fair value ($ per share) 22.74    
Forfeited, weighted-average grant date fair value ($ per share) 22.83    
Exchanged for restricted stock,weighted-average grant date fair value ($ per share) 29.39    
Unvested, weighted-average grant date fair value, end of period ($ per share) $ 22.82 $ 22.09