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Other Retirement Plans | 12 Months Ended
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Dec. 31, 2025
Retirement Benefits [Abstract] |
Other Retirement Plans | Other Retirement Plans Multiemployer Plans As discussed in Note 1 - Business, Basis of Presentation and Significant Accounting Policies, certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees, which require the Company to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to MEPPs. The PPA defines the funding rules for defined benefit pension plans and establishes funding classifications for U.S.-registered multiemployer pension plans. Under the PPA, plans are classified into one of five categories based on multiple factors, which categories are also referred to as a plan’s “zone status”: Green (safe), Yellow (endangered), Orange (seriously endangered), and Red (critical or critical and declining). Factors included in the determination of a plan’s zone status include: funded percentage, cash flow position and whether the plan is projecting a minimum funding deficiency. A multiemployer plan that is so underfunded as to be in “endangered,” “seriously endangered,” “critical,” or “critical and declining” status, as determined under the PPA, is required to adopt a funding improvement plan (“FIP”) or a rehabilitation plan (“RP”), which, among other actions, could include decreased benefits and increased employer contributions, which could take the form of a surcharge on benefit contributions. These actions are intended to improve their funding status over a period of years. If a pension fund is in critical status, a participating employer must pay an automatic surcharge in addition to contributions otherwise required under the collective bargaining agreement (“CBA”). With some exceptions, the surcharge is equal to 5% of required contributions for the initial critical year and 10% for each succeeding plan year in which the plan remains in critical status. The surcharge ceases on the effective date of a CBA or other agreement that includes contribution and benefit terms consistent with the rehabilitation plan. Certain plans in which the Company participates are in “endangered,” “seriously endangered,” “critical,” or “critical and declining” status. The amount of additional funds, if any, that the Company could be obligated to contribute to these plans in the future cannot be estimated due to the uncertainty of the future levels of work that could be required of the union employees covered by these plans, as well as the required future contribution rates and possible surcharges applicable to these plans. See Note 15 - Commitments and Contingencies for additional information. Details of significant multiemployer pension plans as of and for the periods indicated, based upon information available to the Company from plan administrators, as well as publicly available information on the U.S. Department of Labor website, are provided in the following table:
|  |  | Contributions (in millions) Year Ended December 31, |  | Pension Protection Act Zone Status |  |  |
Multiemployer Pension Plan | Employer Identification Number | Plan Number | 2025 |  | 2024 |  | 2023 | Expiration Date of CBA | 2025 | As of |  | 2024 | As of |  | FIP/RP Status | Surcharge
National Electrical Benefit Fund | 530181657 | 001 | $ | 19.8 |  |  | $ | 24.1 |  |  | $ | 18.3 |  | Varies through 12/31/2030 | Green | 12/31/2024 |  | Green | 12/31/2023 | (a) | NA | No
Central Pension Fund of the IUOE & Participating Employers | 366052390 | 001 | 16.4 |  |  | 16.8 |  |  | 19.2 |  | Varies through 3/31/2030 | Green | 1/31/2025 | (a) | Green | 1/31/2024 | (a) | NA | No
Local Union No.9 IBEW and Outside Contractors Pension Fund | 516077720 | 001 | 7.3 |  |  | 3.5 |  |  | 7.2 |  | Varies through 5/25/2030 | Green | 10/31/2024 | (a) | Green | 10/31/2023 | (a) | NA | No
IBEW Local 456 Pension Plan | 226238995 | 001 | 6.3 |  |  | 3.9 |  |  | 3.1 |  | 12/21/2029 | Green | 12/31/2024 | (a) | Green | 12/31/2023 | (a) | NA | No
NECA-IBEW Pension Trust Fund | 516029903 | 001 | 4.9 |  |  | 0.7 |  |  | 0.6 |  | Varies through 5/31/2028 | Green | 5/31/2024 |  | Green | 5/31/2023 |  | NA | No
Pipeline Industry Pension Fund | 736146433 | 001 | 4.4 |  |  | 3.8 |  |  | 6.0 |  | Varies through 10/31/2026 | Green | 12/31/2024 | (a) | Green | 12/31/2023 | (a) | NA | No
Central Laborers' Pension Fund | 376052379 | 001 | 4.3 |  |  | 3.0 |  |  | 2.3 |  | Varies through 4/30/2030 | Green | 12/31/2024 | (a) | Yellow | 12/31/2023 | (b) | NA | No
Heavy & General Laborers' Local Unions 472 and 172 of New Jersey Pension Fund | 226032103 | 001 | 3.6 |  |  | 3.5 |  |  | 3.7 |  | Varies through 2/28/2027 | Green | 3/31/2025 | (a) | Green | 3/31/2024 | (a) | NA | No
Indiana Laborers Pension Fund | 356027150 | 001 | 3.2 |  |  | 1.1 |  |  | 1.2 |  | Varies through 5/31/2027 | Green | 5/31/2025 |  | Green | 5/31/2024 |  | NA | No
Chicago & Vicinity Laborers' District Council Pension Plan | 362514514 | 002 | 2.9 |  |  | 2.0 |  |  | 1.4 |  | Varies through 5/31/2028 | Green | 5/31/2024 |  | Green | 5/31/2023 |  | NA | No
Midwest Operating Engineers Pension Trust Fund | 366140097 | 001 | 2.8 |  |  | 1.7 |  |  | 2.7 |  | Varies through 5/31/2028 | Green | 3/31/2025 |  | Green | 3/31/2024 |  | NA | No
Construction Laborers Pension Trust for Southern California | 436159056 | 001 | 2.6 |  |  | 2.6 |  |  | 2.9 |  | Varies through 5/31/2028 | Green | 12/31/2024 |  | Green | 12/31/2023 | (a) | NA | No
Fox Valley & Vicinity Laborers Pension Fund | 366147409 | 001 | 1.9 |  |  | 1.2 |  |  | 1.3 |  | 5/31/2026 | Green | 5/31/2024 | (a) | Green | 5/31/2023 | (a) | NA | No
Teamsters National Pipe Line Pension Plan | 461102851 | 001 | 1.9 |  |  | 2.9 |  |  | 3.9 |  | Varies through 6/30/2026 | Green | 12/31/2024 | (a) | Green | 12/31/2023 | (a) | NA | No
Laborers' National Pension Fund | 751280827 | 001 | 1.7 |  |  | 1.6 |  |  | 1.6 |  | Varies through 11/30/2028 | Red | 12/31/2024 |  | Red | 12/31/2023 |  | Implemented | No
Laborers' Local Union No.158 Pension Plan | 236580323 | 001 | 1.6 |  |  | 1.1 |  |  | 1.2 |  | Varies through 5/31/2027 | Green | 12/31/2024 | (a) | Green | 12/31/2023 | (a) | NA | No
IBEW Local 1249 Pension Plan | 156035161 | 001 | 1.4 |  |  | 3.2 |  |  | 3.4 |  | Varies through 5/6/2029 | Green | 12/31/2024 |  | Green | 12/31/2023 |  | NA | No
Carpenters Pension Fund of Illinois | 366147396 | 001 | 1.2 |  |  | 1.3 |  |  | 0.9 |  | 4/30/2029 | Green | 12/31/2024 |  | Green | 12/31/2023 |  | NA | No
San Diego County Construction Laborers' Pension Trust Fund | 956090541 | 001 | 1.1 |  |  | 1.3 |  |  | 1.4 |  | Varies through 6/30/2026 | Green | 8/31/2024 | (a) | Green | 8/31/2023 | (a) | NA | No
Operating Engineers' Local 324 Pension Fund | 381900637 | 001 | 1.1 |  |  | 0.5 |  |  | 0.6 |  | 5/31/2026 | Red | 4/30/2024 |  | Red | 4/30/2023 |  | Implemented | No
Laborers District Council of Virginia Pension Plan | 546117299 | 001 | 0.7 |  |  | 3.6 |  |  | 2.9 |  | 5/31/2026 | Green | 12/31/2024 |  | Green | 12/31/2023 |  | NA | No
West Virginia Laborers' Pension Trust Fund | 556026775 | 001 | 0.6 |  |  | 2.1 |  |  | 3.2 |  | 5/31/2026 | Green | 3/31/2025 | (a) | Green | 3/31/2024 | (a) | NA | No
Other funds |  |  | 27.6 |  |  | 23.1 |  |  | 29.4 |  |  |  |  |  |  |  |  |  |
Total multiemployer pension plan contributions | $ | 119.3 |  |  | $ | 108.6 |  |  | $ | 118.4 |  |  |  |  |  |  |  |  |  |
(a)The Company’s contributions to this plan represent greater than 5% of the plan’s total contributions. (b)This plan has utilized extended amortization provisions, which provide plans with extensions of time to amortize pension funding shortfalls. The number of union employees employed at a given time, and the plans in which they participate, vary depending upon the location and number of ongoing projects and the need for union resources in connection with those projects. Total contributions to multiemployer plans and the related number of employees covered by these plans for the periods indicated were as follows:
| Multiemployer Plans
| Covered Employees |  | Contributions (in millions)
Year Ended December 31: | Low |  | High |  | Pension |  | Other Multiemployer |  | Total
2025 | 6,840 |  |  | 10,060 |  |  | $ | 119.3 |  |  | $ | 61.3 |  |  | $ | 180.6 |
2024 | 6,960 |  |  | 9,448 |  |  | $ | 108.6 |  |  | $ | 41.8 |  |  | $ | 150.4 |
2023 | 6,806 |  |  | 11,025 |  |  | $ | 118.4 |  |  | $ | 59.1 |  |  | $ | 177.5 |
The fluctuations in the number of employees covered under multiemployer plans and associated contributions in the table above related primarily to the timing of activity for the Company’s union resource-based projects, as well as the effects of the Company’s acquisitions. For the years ended December 31, 2025, 2024 and 2023, multiemployer plan activity was driven primarily by project work within the Company’s Power Delivery and Pipeline Infrastructure operations. In 2023, multiemployer plan activity also included acquisition-related project work within the Company’s Clean Energy and Infrastructure operations.

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