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Employee Retirement Plans - Details of the multiemployer plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Boilermaker-Blacksmith National Pension Trust |  |  |
Multiemployer Plans [Line Items] |  |  |
PPA Zone Status | Red | Green |
Rehabilitation plan status | Implemented |  |
Contributions | $ 1.7 | $ 1.5 | $ 1.6
Surcharge imposed | No |  |
Heavy and General Laborers Local Unions 472 and 172 of New Jersey Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
PPA Zone Status | Green | Green |
Rehabilitation plan status | NA |  |
Contributions | $ 0.2 | $ 0.0 | 0.0
Surcharge imposed | No |  |
Operating Engineers 825 Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
PPA Zone Status | Green | Green |
Rehabilitation plan status | NA |  |
Contributions | $ 0.1 | $ 0.0 | $ 0.0
Surcharge imposed | No |  |

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