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Water And Wastewater Utility Acquisitions (Narrative) (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 12, 2022 USD ($) | Jul. 29, 2022 customer | Jul. 31, 2025 USD ($) item customer | Apr. 30, 2025 USD ($) customer | Jan. 31, 2025 USD ($) customer | Oct. 31, 2024 USD ($) customer | Jun. 30, 2024 USD ($) customer | May 31, 2024 USD ($) customer | Sep. 30, 2023 USD ($) customer | Dec. 31, 2019 USD ($) customer item | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 2,348,559 | $ 2,340,713
Delaware [Member] | Wastewater Utility System [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  | 16,000 |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  |  | $ 276,500 |  |
Retail customers | customer |  |  |  |  |  |  |  |  |  | 198,000 |  |
Number of municipalities | item |  |  |  |  |  |  |  |  |  | 42 |  |
Ohio [Member] | Village of Midvale, Ohio’s water system [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  | 1,000 |  |  |  |  |  |  |  |
Cash paid for business acquisition |  |  |  | $ 2,950 |  |  |  |  |  |  |  |
Texas [Member] | Integra Water Texas, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  | 1,100 |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  |  | $ 4,400 |  |  |  |  |  |
East Whiteland Township [Member] | Water And Wastewater Utility Systems [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  | 4,018 |  |  |  |  |  |  |  |  |  |
Cash paid for business acquisition | $ 54,374 |  |  |  |  |  |  |  |  |  |  |
Glenview, Illinois [Member] | Wastewater Utility Assets Of Westfield HOA [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  | 200 |  |  |  |
Cash paid for business acquisition |  |  |  |  |  |  |  | $ 67 |  |  |  |
Greenville, Pennsylvania [Member] | Greenville Sanitary Authority’s Wastewater Utility Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  | 2,300 |  |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  | $ 18,000 |  |  |  |  |  |  |
Greenville, Pennsylvania [Member] | Water And Wastewater Utility Systems [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  | 3,000 |  |  |
Cash paid for business acquisition |  |  |  |  |  |  |  |  | $ 18,000 |  |  |
Beaver Falls Pennsylvania [Member] | Wastewater Utility System [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  | 3,200 |  |  |  |  |  |  |  |  |
Number of dwelling units | item |  |  | 3,800 |  |  |  |  |  |  |  |  |
Cash paid for business acquisition |  |  | $ 37,750 |  |  |  |  |  |  |  |  |
Number of municipalities | item |  |  | 7 |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  | $ 29,900 |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 7,850 |  |  |  |  |  |  |  |  |
Harris County, Texas [Member] | Private Water And Wastewater Utility Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  | 400 |  |  |  |  |
Cash paid for business acquisition |  |  |  |  |  |  | $ 1,125 |  |  |  |  |
Indiana [Member] | Wastewater Utility Assets in Morgan County [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  | 100 |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  |  | $ 500 |  |  |  |  |  |

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