Segment and Geographic Information - Revenues by Geographic Region (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Revenues
Revenues	$ 6,228.6	$ 5,987.6	$ 6,498.6
United States
Revenues
Revenues	5,847.8	5,625.1	6,025.2
All other countries
Revenues
Revenues	$ 380.8	$ 362.5	$ 473.3