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Stock-Based Compensation Plans - Weighted-average Valuation Assumptions For Options Granted (Details) - Stock option awards - $ / shares
12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of option in years 6 years 3 months 21 days 6 years 14 days 6 years 7 days
Expected stock price volatility 19.83% 20.58% 22.15%
Risk-free interest rate 2.77% 2.21% 2.03%
Expected dividend yield 1.18% 0.97% 1.01%
Per share weighted-average fair value at date of grant (usd per share) $ 12.83 $ 14.25 $ 12.55