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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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