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Commitments and Contingencies - Investment and Strategic Arrangements (Details) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2025 USD ($) constructionProject | Dec. 31, 2025 CAD ($) constructionProject | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CAD ($)
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of joint ventures | constructionProject |  | 9 | 9 |  |
Proportionately Consolidated Non-Controlled Joint Venture |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Payments for advance to affiliate | $ | $ 0.5 |  |  |  |
Proportionately Consolidated Non-Controlled Joint Venture | Performance and Payment Bonds |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Outstanding bonds, amount |  | $ 7.1 | $ 9.7 | $ 6.7 | $ 9.7
Joint Ventures That Provide Electrical Transmission Infrastructure Services | Minimum | Proportionately Consolidated Non-Controlled Joint Venture |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Proportionately consolidated non-controlled joint venture, ownership percentage |  | 85.00% | 85.00% |  |
Joint Ventures That Provide Electrical Transmission Infrastructure Services | Maximum | Proportionately Consolidated Non-Controlled Joint Venture |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Proportionately consolidated non-controlled joint venture, ownership percentage |  | 90.00% | 90.00% |  |
Joint Venture Civil Construction Project | Minimum | Proportionately Consolidated Non-Controlled Joint Venture |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Proportionately consolidated non-controlled joint venture, ownership percentage |  | 25.00% | 25.00% |  |
Joint Venture Civil Construction Project | Maximum | Proportionately Consolidated Non-Controlled Joint Venture |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Proportionately consolidated non-controlled joint venture, ownership percentage |  | 50.00% | 50.00% |  |
Canadian Joint Venture | Proportionately Consolidated Non-Controlled Joint Venture |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Proportionately consolidated non-controlled joint venture, ownership percentage |  | 35.00% | 35.00% |  |

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