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Employee Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Retirement Benefits [Abstract] |
Total employee retirement plan expense | Total employee retirement plan expense, which includes related administrative expenses, is as follows:
| Year Ended December 31,
| 2025 |  | 2024 |  | 2023
| (in millions)
Defined contribution plans | $ | 18.2 |  |  | $ | 16.8 |  |  | $ | 15.3 |
Multiemployer plans | 2.8 |  |  | 1.8 |  |  | 1.5 |
| $ | 21.0 |  |  | $ | 18.6 |  |  | $ | 16.8 |
Details of multiemployer plan | Our participation in multiemployer plans for the year ended December 31, 2025 are outlined in the table below. The Pension Protection Act (“PPA”) zone status is based upon the most recent information available at December 31, 2025 and 2024 and is obtained from the multiemployer plan's regulatory filings available in the public domain and certified by the plan's actuary. Among other factors, plans in the green zone are at least 80% funded, plans in the yellow zone are less than 80% funded, and plans in the red zone are less than 65% funded. Federal law requires that plans classified in the yellow or red zones adopt a funding improvement plan or a rehabilitation plan in order to improve the financial health of the plan. The Company's contributions to the multiemployer plans were less than 5% of total contributions to any plan. The last column in the table lists the expiration date of the last expiring collective bargaining agreement to which the plan is subject.
|  |  |  | PPA Zone Status |  |  |  | Contributions for Year Ended December 31, |  |  |  |
Pension Fund |  | Employer Identification Number |  | 2025 |  | 2024 |  | Rehabilitation plan status |  | 2025 |  | 2024 |  | 2023 |  | Surcharge imposed |  | Expiration date of collective bargaining agreement
|  |  |  |  |  |  |  |  |  | (in millions) |  |  |  |
Boilermaker-Blacksmith National Pension Trust |  | 48-6168020 |  | Red |  | Red |  | Implemented |  | $ | 1.7 |  |  | $ | 1.7 |  |  | $ | 1.5 |  |  | No |  | 06/30/2028
Heavy and General Laborers Local Unions 472 and 172 of New Jersey Pension Fund |  | 22-6032103 |  | Green |  | Green |  | NA |  | $ | 0.5 |  |  | $ | 0.2 |  |  | $ | — |  |  | No |  | 02/28/2027
Operating Engineers 825 Pension Fund |  | 22-6033380 |  | Green |  | Green |  | NA |  | $ | 0.5 |  |  | $ | 0.1 |  |  | $ | — |  |  | No |  | 06/30/2026

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