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Employee Benefit Plans - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Oct. 31, 2021 USD ($) plan | Oct. 31, 2020 USD ($) | Oct. 31, 2019 USD ($) | Sep. 30, 2021 USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Expected return on assets | $ 0.3 | $ 0.4 | $ 0.4 |
Net periodic benefit cost | 0.3 | 0.2 | 0.6 |
Expected future benefit payments | $ 13.5 |  |  |
Number of defined contribution plans | plan | 4 |  |  |
Cost recognized | $ 21.6 | 18.2 | 24.3 |
Multiemployer Plans, Postretirement Benefit Plans |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Contributions by ABM | 270.8 | 264.8 | 269.8 |
Defined Contribution Plans | Multiemployer Plans, Pension Plans |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Cost recognized | 21.2 | 15.5 | 9.0 |
Rabbi Trust |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Fair value deferred compensation plan assets | 4.9 | 2.6 |  |
Deferred Compensation Plans |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Total liability of deferred compensation | 32.1 | 13.6 |  |
Compensation expense | $ 0.2 | $ 0.2 | $ 0.3 |
Deferred Compensation Plans | Able |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Total liability of deferred compensation |  |  |  | $ 18.0
Equity Securities |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Target plan asset allocations | 30.00% |  |  |
Fixed Income Funds |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Target plan asset allocations | 70.00% |  |  |

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