Segments and Related Information - Schedule of Financial Information by Reportable Segment - Capital Expenditures (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Capital Expenditures: | ||||
| Consolidated capital expenditures | $ 87.4 | $ 68.7 | $ 275.7 | $ 179.8 |
| Operating Segments | Communications | ||||
| Capital Expenditures: | ||||
| Consolidated capital expenditures | 10.4 | 3.9 | 20.2 | 20.1 |
| Operating Segments | Clean Energy and Infrastructure | ||||
| Capital Expenditures: | ||||
| Consolidated capital expenditures | 13.5 | 7.7 | 41.0 | 27.0 |
| Operating Segments | Power Delivery | ||||
| Capital Expenditures: | ||||
| Consolidated capital expenditures | 19.0 | 15.5 | 76.0 | 56.4 |
| Operating Segments | Pipeline Infrastructure | ||||
| Capital Expenditures: | ||||
| Consolidated capital expenditures | 32.7 | 27.6 | 106.2 | 59.2 |
| Operating Segments | Other | ||||
| Capital Expenditures: | ||||
| Consolidated capital expenditures | 0.0 | 0.0 | 0.0 | 0.0 |
| Corporate | ||||
| Capital Expenditures: | ||||
| Consolidated capital expenditures | $ 11.8 | $ 14.0 | $ 32.3 | $ 17.1 |