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v3.23.4

EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Millions | 12 Months Ended
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Oct. 31, 2023 USD ($) plan | Oct. 31, 2022 USD ($) | Oct. 31, 2021 USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Expected return on assets | $ 0.2 | $ 0.4 | $ 0.3
Net periodic benefit cost | 0.6 | 0.1 | 0.3
Expected future benefit payments | $ 11.0 |  |
Number of defined contribution plans | plan | 2 |  |
Cost recognized | $ 29.8 | 27.7 | 21.6
Defined Contribution Plans |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Cost recognized | 59.2 | 54.7 | 21.2
Multiemployer Plans, Postretirement Benefit Plans |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Contributions by ABM | 441.8 | 426.6 | 270.8
Rabbi Trust |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Fair value deferred compensation plan assets | 4.0 | 4.1 |
Deferred Compensation Plans |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Total liability of deferred compensation | 27.0 | 27.5 |
Compensation expense | $ 0.5 | $ 0.3 | $ 0.2

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