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Credit Facility - Interest Rate Swaps Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020 | Oct. 31, 2020
Line of Credit Facility [Line Items] |  |  |  |  |
Interest expense | $ 6.3 | $ 13.8 | $ 22.6 | $ 34.5 |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | (0.6) |  | (0.6) |  |
Tax to be reclassified during the next 12 months | (0.1) |  | (0.1) |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Net loss from cash flow hedges recorded in accumulated other comprehensive loss, net of tax |  |  | (0.9) |  | $ (3.3)
Tax related to amounts in accumulated other comprehensive loss |  |  | 0.1 |  | $ (0.9)
Interest expense | (1.2) | 1.2 | (3.5) | (3.6) |
Interest expense, tax | $ 0.4 | $ 0.5 | $ 1.3 | $ (1.4) |

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