Basis of Presentation and Significant Accounting Policies - Management Reimbursement Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Segment Reporting Information [Line Items]
Parking facility management fee revenue	$ 1,484.6	$ 1,394.1	$ 1,496.0	$ 1,612.9	$ 1,648.0	$ 1,647.9	$ 1,594.7	$ 1,607.9	$ 5,987.6	$ 6,498.6	$ 6,442.2
Management Reimbursement Revenue
Segment Reporting Information [Line Items]
Parking facility management fee revenue									295.6	378.7	376.4
Management Reimbursement Revenue | Business & Industry
Segment Reporting Information [Line Items]
Parking facility management fee revenue									221.4	283.1	276.6
Management Reimbursement Revenue | Aviation
Segment Reporting Information [Line Items]
Parking facility management fee revenue									$ 74.3	$ 95.5	$ 99.9