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Rate Activity (Narrative) (Details) - USD ($) $ in Thousands | Oct. 09, 2024 | Sep. 12, 2024 | Mar. 23, 2024 | Jan. 02, 2024 | Dec. 13, 2023 | Sep. 28, 2023 | Jun. 05, 2023 | Sep. 30, 2024 | Feb. 28, 2023
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Pennsylvania and Illinois [Member] | Wastewater [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Distribution system improvement charges reset level upon new base rates |  |  |  |  |  |  |  | $ 28,733 |
North Carolina [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
No refunds of revenue previously billed and collected |  |  |  |  |  |  |  |  | $ 0
Illinois [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  | $ 19,196 |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage |  |  |  | 18.90% |  |  |  |  |
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 |  |  |  |  |  |  |  |
Texas [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Infrastructure rehabilitation surcharges designed to increase total operating revenues on an annual basis |  |  |  |  |  | $ 8,388 |  |  |
Virginia [Member] | Regulated Water And Wastewater [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  | $ 5,490 |  |  |  |  |  |  |
Base rate increase designed to increase total operating revenues on an annual basis |  | 23.80% |  |  |  |  |  |  |
Pennsylvania [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  | $ 126,675 |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage |  |  | 18.90% |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  |  | $ 4,850 |  |  |  |
Ohio [Member] | Regulated Water [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Distribution system improvement charges reset level upon new base rates |  |  |  |  |  |  |  | 2,127 |
Kentucky [Member] | Regulated Natural Gas [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Distribution system improvement charges reset level upon new base rates |  |  |  |  |  |  |  | $ 1,170 |
Year 1 [Member] | North Carolina [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  |  |  |  | $ 14,001 |  |
Year 2 [Member] | North Carolina [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  |  |  |  | 3,743 |  |
Year 3 [Member] | North Carolina [Member] |  |  |  |  |  |  |  |  |
Water And Wastewater Rates [Line Items] |  |  |  |  |  |  |  |  |
Base rate increase (decrease) |  |  |  |  |  |  | $ 4,130 |  |

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