Share-Based Compensation Plans - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of granted purchase rights per share (in USD per share)	$ 2.17	$ 1.75	$ 1.77
Common stock issued (in shares)	0.1	0.1	0.1
Fair value of common stock issued per share (in USD per share)	$ 41.18	$ 33.18	$ 33.60
Aggregate purchases	$ 3.3	$ 3.5	$ 4.1