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Basis of Presentation and Significant Accounting Policies - Management Reimbursement Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Parking facility management fee revenue | $ 1,496.0 | $ 1,594.7 | $ 3,109.0 | $ 3,202.6
Management Reimbursement Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Parking facility management fee revenue | 82.4 | 92.8 | 182.0 | 188.0
Management Reimbursement Revenue | Business & Industry |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Parking facility management fee revenue | 61.7 | 69.3 | 135.4 | 140.3
Management Reimbursement Revenue | Aviation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Parking facility management fee revenue | $ 20.7 | $ 23.5 | $ 46.6 | $ 47.6

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