Share-Based Compensation Plans - Monte Carlo Assumptions (Details) - $ / shares		12 Months Ended
		Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected life	[1]	2 years 1 month 20 days	2 years 1 month 16 days	2 years 1 month 25 days
Expected stock price volatility	[2]	21.40%	19.00%	18.90%
Risk-free interest rate	[3]	1.30%	0.80%	0.80%
Stock price (usd per share)	[4]	$ 40.21	$ 38.65	$ 30.25

[1] The expected life represents the remaining performance period of the awards.

[2] The expected volatility for each grant is determined based on the historical volatility of our common stock over a period equal to the remaining term of the performance period from the date of grant for all awards.

[3] The risk-free interest rate is based on the continuous compounded yield on U.S. Treasury Constant Maturity Rates with varying remaining terms; the yield is determined over a time period commensurate with the performance period from the grant date.

[4] The stock price is the closing price of our common stock on the valuation date.