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Share-Based Compensation Plans - Monte Carlo Assumptions (Details) - $ / shares
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Share-based Payment Arrangement [Abstract]      
Expected life 2 years 9 months 21 days 2 years 9 months 21 days 2 years 9 months 21 days
Expected stock price volatility 28.70% 27.70% 21.60%
Risk-free interest rate 1.50% 2.50% 2.00%
Stock price (usd per share) $ 37.99 $ 34.92 $ 39.02