Basis of Presentation and Significant Accounting Policies - Management Reimbursement Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Parking facility management fee revenue	$ 1,648.0	$ 1,647.9	$ 1,594.7	$ 1,607.9	$ 1,648.8	$ 1,624.3	$ 1,580.8	$ 1,588.3	$ 6,498.6	$ 6,442.2	$ 5,453.6
Management Reimbursement Revenue
Segment Reporting Information [Line Items]
Parking facility management fee revenue									378.7	376.4	333.2
Management Reimbursement Revenue | Business & Industry
Segment Reporting Information [Line Items]
Parking facility management fee revenue									283.1	276.6	252.9
Management Reimbursement Revenue | Aviation
Segment Reporting Information [Line Items]
Parking facility management fee revenue									$ 95.5	$ 99.9	$ 80.4