Basis of Presentation and Significant Accounting Policies - Management Reimbursement Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Segment Reporting Information [Line Items]
Parking facility management fee revenue	$ 96.1	$ 79.1	$ 189.4	$ 158.0
Business & Industry
Segment Reporting Information [Line Items]
Parking facility management fee revenue	63.5	58.1	126.5	115.9
Aviation
Segment Reporting Information [Line Items]
Parking facility management fee revenue	27.6	16.2	53.1	32.7
Healthcare
Segment Reporting Information [Line Items]
Parking facility management fee revenue	$ 5.0	$ 4.8	$ 9.9	$ 9.4