Rate Activity (Narrative) (Details) - USD ($) $ in Thousands	Jan. 19, 2024	Jan. 02, 2024	Dec. 29, 2023	Dec. 13, 2023	Sep. 28, 2023	Jul. 27, 2023	Jun. 05, 2023	Mar. 31, 2024	Feb. 28, 2023
Pennsylvania and Illinois [Member] | Wastewater [Member]
Water And Wastewater Rates [Line Items]
Distribution system improvement charges reset level upon new base rates								$ 7,445
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]
Base rate increase (decrease)	$ 8,328
Public Utilities, Approved Rate Increase (Decrease), Percentage	17.30%
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]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)						$ 6,911
Public Utilities, Approved Rate Increase (Decrease), Percentage						29.50%
Pennsylvania [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)			$ 156,024
Public Utilities, Approved Rate Increase (Decrease), Percentage			18.70%
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								1,627
Kentucky [Member] | Regulated Natural Gas [Member]
Water And Wastewater Rates [Line Items]
Distribution system improvement charges reset level upon new base rates								$ 1,220
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