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Segments and Related Information - Schedule of Financial Information by Reportable Segment - Depreciation and Amortization (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | $ 427.1 | $ 506.6 | $ 603.2
Reportable Segments | Communications |  |  |
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 60.3 | 74.4 | 84.0
Reportable Segments | Clean Energy and Infrastructure |  |  |
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 108.1 | 123.0 | 144.2
Reportable Segments | Power Delivery |  |  |
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 142.3 | 170.2 | 211.7
Reportable Segments | Pipeline Infrastructure |  |  |
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 107.4 | 128.8 | 152.9
Reportable Segments | Other |  |  |
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 0.0 | 0.0 | 0.0
Corporate |  |  |
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | $ 9.0 | $ 10.2 | $ 10.4

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