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Property, Plant, and Equipment - PGL and NSG Impairment (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2023 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, plant, and equipment |  |  |  |  |
Other operation and maintenance |  |  | $ 2,158.0 | $ 2,100.5 | $ 1,938.0
PGL |  |  |  |  |
Property, plant, and equipment |  |  |  |  |
Disallowance of improvements to service center capital costs | $ 177.2 |  |  |  |
Other operation and maintenance |  | $ 12.1 |  |  |
NSG |  |  |  |  |
Property, plant, and equipment |  |  |  |  |
Disallowance of gas infrastructure project capital costs | 1.7 |  |  |  |
PGL and NSG |  |  |  |  |
Property, plant, and equipment |  |  |  |  |
Non-cash impairment of PP&E | $ 178.9 |  |  |  |

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