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EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Millions | 12 Months Ended
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Oct. 31, 2024 USD ($) plan | Oct. 31, 2023 USD ($) | Oct. 31, 2022 USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Expected return on assets | $ 0.0 | $ 0.2 | $ 0.4
Net periodic benefit cost | 0.8 | 0.6 | 0.1
Expected future benefit payments | $ 11.2 |  |
Number of defined contribution plans | plan | 2 |  |
Cost recognized | $ 30.6 | 29.8 | 27.7
Defined Contribution Plans |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Cost recognized | 54.5 | 59.2 | 54.7
Multiemployer Plans, Postretirement Benefit Plans |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Contributions by ABM | 434.1 | 441.8 | 426.6
Rabbi Trust |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Fair value deferred compensation plan assets | 4.4 | 4.0 |
Deferred Compensation Plans |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Total liability of deferred compensation | 26.7 | 27.0 |
Compensation expense | $ 0.6 | $ 0.5 | $ 0.3

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