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Business, Basis of Presentation and Significant Accounting Policies - Goodwill and Indefinite-Lived Intangible Assets (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) reportingUnit | Dec. 31, 2023 USD ($) reportingUnit
Goodwill [Line Items] |  |  |  |
Impairment loss |  | $ 115.3 |  | $ 119.3
Goodwill, impairment loss |  | 0.0 | $ 0.0 | 0.0
Goodwill |  |  |  |
Goodwill [Line Items] |  |  |  |
Discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage) | 1.00% |  |  |
Power Delivery |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment loss |  | 0.0 |  | $ 0.0
Goodwill impairment testing, number of reporting units | reportingUnit |  |  |  | 1
Communications |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment loss |  | 0.0 |  | $ 0.0
Goodwill impairment testing, number of reporting units | reportingUnit |  |  | 2 |
Clean Energy and Infrastructure |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment loss |  | 0.0 |  | $ 0.0
Goodwill impairment testing, number of reporting units | reportingUnit |  |  | 1 | 3
Pipeline Infrastructure |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment loss |  | $ 115.3 |  | $ 119.3
Goodwill impairment testing, number of reporting units | reportingUnit |  |  | 1 | 1
Power Delivery Segment, Reporting Unit One | Power Delivery |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment loss | $ 0.0 |  |  |

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