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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Oct. 31, 2024
Retirement Benefits [Abstract] |
Schedule of Information for the Plans | Information for the Plans
| As of October 31,
(in millions) | 2024 |  | 2023
Net obligations | $ | 6.9 |  |  | $ | 6.1 |
Projected benefit obligations(1) | 12.5 |  |  | 11.9 |
Fair value of assets | 5.6 |  |  | 5.8 |
(1) At October 31, 2024 and 2023, total projected benefit obligations related to unfunded and underfunded plans were $12.5 million and $11.9 million, respectively.
Schedule of Multiemployer Defined Benefit Pension Plans | Key Information for Individually Significant Multiemployer Defined Benefit Pension Plans(1)
($ in millions) |  |  |  | Pension Protection Act Zone Status(3) |  | FIP/RP Status(4) |  | Contributions by ABM |  | Surcharge Imposed(5) |  | Expiration Dates of Collective Bargaining Agreements
Pension Fund |  | EIN/PN(2) |  | 2024 |  | 2023 |  | Pending/ Implemented |  | 2024 |  | 2023 |  | 2022
Building Service 32BJ Pension Fund |  | 13-1879376 / 001 |  | Yellow 6/30/2024 |  | Yellow 6/30/2023 |  | Implemented |  | $ | 22.1 |  |  | $ | 21.4 |  |  | $ | 22.7 |  |  | No |  | 10/15/2027 - 12/31/2027
S.E.I.U National Industry Pension Fund |  | 52-6148540 / 001 |  | Red 12/31/2023 |  | Red 12/31/2022 |  | Implemented |  | 19.4 |  |  | 19.3 |  |  | 17.6 |  |  | Yes |  | 6/30/2025 - 7/31/2028
Central Pension Fund of the IUOE & Participating Employers |  | 36-6052390 / 001 |  | Green 1/31/2024 |  | Green 1/31/2023 |  | N/A* |  | 12.4 |  |  | 13.0 |  |  | 12.8 |  |  | N/A* |  | 12/31/2024 - 6/30/2029
SEIU Local 1 & Participating Employers Pension Trust |  | 36-6486542 / 001 |  | Green 9/30/2023 |  | Green 9/30/2022 |  | N/A* |  | 4.3 |  |  | 4.8 |  |  | 5.8 |  |  | N/A* |  | 5/31/2026 - 4/4/2027
Western Conference of Teamsters Pension Plan |  | 91-6145047 / 001 |  | Green 12/31/2023 |  | Green 12/31/2022 |  | N/A* |  | 2.7 |  |  | 2.4 |  |  | 2.2 |  |  | N/A* |  | 11/30/2026 - 12/31/2029
IUOE Stationary Engineers Local 39 Pension Plan |  | 94-6118939 / 001 |  | Green 12/31/2023 |  | Green 12/31/2022 |  | N/A* |  | 2.5 |  |  | 4.6 |  |  | 4.4 |  |  | N/A* |  | 8/31/2029
All Other Plans: |  |  |  |  |  |  |  |  |  | 13.9 |  |  | 8.0 |  |  | 8.2 |  |  |  |  |
Total Contributions |  |  |  |  |  |  |  |  |  | $ | 77.3 |  |  | $ | 73.6 |  |  | $ | 73.8 |  |  |  |  |
*Not applicable (1) To determine individually significant plans, we evaluated several factors, including our total contributions to the plan, our significance to the plan in terms of participating employees and contributions, and the funded status of the plan. (2) The “EIN/PN” column provides the Employer Identification Number and the three-digit plan number assigned to the plan by the IRS. (3) The Pension Protection Act Zone Status columns provide the two most recently available Pension Protection Act zone status reports from each plan. The zone status is based on information provided to us and other participating employers and is certified by each plan’s actuary. Among other factors, plans in the red zone are generally less than 65% funded, plans in the yellow zone are less than 80% funded, and plans in the green zone are at least 80% funded. (4) Indicates whether a Financial Improvement Plan (“FIP”) for yellow zone plans or a Rehabilitation Plan (“RP”) for red zone plans is pending or implemented. (5) Indicates whether our contribution in 2024 included an amount as imposed by a plan in the red zone in addition to the contribution rate specified in the applicable collective bargaining agreement. Multiemployer Pension Plans for which ABM Is a Significant Contributor
Pension Fund |  | Contributions to the plan exceeded more than 5% of total contributions per most currently available Forms 5500 (as of the plan’s year end)
Apartment Employees Trust Fund* |  | 12/31/2022 and 12/31/2021
Arizona Sheet Metal Pension Trust Fund* |  | 6/30/2023, 6/30/2022,and 6/30/2021
Building Service 32BJ Pension Fund |  | 6/30/2023, 6/30/2022,and 6/30/2021
Building Service Pension Plan* |  | 4/30/2023, 4/30/2022, and 4/30/2021
Central Pennsylvania Teamsters Defined Benefit Plan* |  | 12/31/2023
Central Pension Fund of the IUOE & Participating Employers |  | 1/31/2024 and 1/31/2023
Contract Cleaners Service Employees' Pension Plan* |  | 12/31/2022 and 12/31/2021
IUOE Local 30 Pension Fund* |  | 12/31/2023 and 12/31/2022
IUOE Stationary Engineers Local 39 Pension Plan |  | 12/31/2023, 12/31/2022, and 12/31/2021
Local 210's Pension Plan* |  | 12/31/2023, 12/31/2022, and 12/31/2021
Local 670 Pension Plan* |  | 12/31/2023, 12/31/2022
Local 68 Engineers Union Pension Plan* |  | 6/30/2023
Local 808 IBT Pension Fund* |  | 9/30/2023
Massachusetts Service Employees Pension Plan* |  | 12/31/2023, 12/31/2022, and 12/31/2021
S.E.I.U National Industry Pension Fund |  | 12/31/2023, 12/31/2022, and 12/31/2021
SEIU Local 1 & Participating Employers Pension Trust |  | 9/30/2023, 9/30/2022, and 9/30/2021
Service Employees International Union Local 1 Cleveland Pension Plan* |  | 12/31/2023, 12/31/2022, and 12/31/2021
Service Employees International Union Local 32BJ, District 36 Building Operators Pension Trust Fund* |  | 12/31/2023, 12/31/2022, and 12/31/2021
Teamsters Local 617 Pension Fund* |  | 2/28/2023, 2/28/2022, and 2/28/2021
Teamsters Local Union No. 727 Pension Plan* |  | 2/28/2023
U.S.W.U. Local 74 Welfare Fund* |  | 12/31/2023, 12/31/2022, and 12/31/2021
* These plans are not separately listed in our multiemployer table as they represent an insignificant portion of our total multiemployer pension plan contributions.

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