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 |