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Rate Activity (Narrative) (Details) $ in Thousands |  |  |  |  |  |  |  |  |  | 6 Months Ended
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Jul. 30, 2025 USD ($) | Jul. 01, 2025 USD ($) | Jun. 30, 2025 USD ($) | Jun. 20, 2025 USD ($) | Apr. 30, 2025 USD ($) | Feb. 07, 2025 USD ($) | Nov. 21, 2024 USD ($) | Oct. 09, 2024 USD ($) | Sep. 12, 2024 USD ($) | Jun. 30, 2025 USD ($) item
Pennsylvania and Ohio [Member] | Regulated Water And Wastewater [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Infrastructure rehabilitation surcharges designed to increase total operating revenues on an annual basis |  |  |  |  |  |  |  |  |  | $ 10,808
North Carolina [Member] | Regulated Water And Wastewater [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution system improvement charges reset level upon new base rates |  |  | $ 5,820 |  |  |  |  |  |  | 5,820
Illinois [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  |  |  |  | $ 11,632 |  |  |
Base rate increase designed to increase total operating revenues on an annual basis |  |  |  |  |  |  | 11.40% |  |  |
New Jersey [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Customer surcharge period |  |  |  |  |  |  |  | 3 years |  |
Service line replacement costs |  |  |  |  |  |  |  | $ 11,535 |  |
Base rate increase (decrease) |  |  |  |  |  |  |  | $ 2,250 |  |
New Jersey [Member] | Regulated Water And Wastewater [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Infrastructure rehabilitation surcharges designed to increase total operating revenues on an annual basis |  |  |  |  |  |  |  |  |  | $ 2,468
Texas [Member] | Regulated Water And Wastewater [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  | $ 29,149 |  |  |  |  |  |
Virginia [Member] | Regulated Natural Gas [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate increase designed to increase total operating revenues on an annual basis |  |  |  |  |  |  |  |  | 23.80% |
Distribution system improvement charges reset level upon new base rates |  |  |  |  |  |  |  |  | $ 5,490 |
Pennsylvania [Member] | Regulated Water And Wastewater [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Allowed base rate increase, amount designed to increase annual operating revenues |  |  |  |  |  | $ 73,000 |  |  |  |
Base rate increase (decrease) |  |  |  |  |  | $ 110,940 |  |  |  |
Base rate increase designed to increase total operating revenues on an annual basis |  |  |  |  |  | 6.73% |  |  |  |
Distribution system improvement charges reset level upon new base rates |  |  |  |  |  | $ 37,940 |  |  |  |
Pennsylvania [Member] | Regulated Natural Gas [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Change in other operating revenue, annually |  |  |  |  |  |  |  |  | 3,000 |
Distribution system improvement charges |  |  |  |  |  |  |  |  | 21,000 |
Base rate increase (decrease) |  |  |  |  |  |  |  |  | $ 111,000 |
Base rate increase designed to increase total operating revenues on an annual basis |  |  |  |  |  |  |  |  | 11.10% |
Distribution system improvement charges reset level upon new base rates |  |  |  |  |  |  |  |  | $ 93,000 |
Ohio [Member] | Regulated Water And Wastewater [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  | $ 14,653 |  |  |  |  |  |  |
Ohio [Member] | Regulated Water [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Number of operating divisions | item |  |  |  |  |  |  |  |  |  | 2
Kentucky [Member] | Regulated Natural Gas [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Allowed base rate increase, amount designed to increase annual operating revenues |  | $ 7,700 |  |  |  |  |  |  |  |
Infrastructure rehabilitation surcharges designed to increase total operating revenues on an annual basis |  |  |  |  |  |  |  |  |  | $ 542
Base rate increase designed to increase total operating revenues on an annual basis |  | 11.20% |  |  |  |  |  |  |  |
Subsequent Event [Member] | Virginia [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate increase (decrease) | $ 7,927 |  |  |  |  |  |  |  |  |
Year 1 [Member] | North Carolina [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  |  | $ 32,847 |  |  |  |  |
Year 2 [Member] | North Carolina [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  |  | 5,915 |  |  |  |  |
Year 3 [Member] | North Carolina [Member] |  |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  |  | $ 6,000 |  |  |  |  |

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