Rate Activity (Details) - USD ($) $ in Thousands		9 Months Ended
	Aug. 20, 2021	Sep. 30, 2021
Illinois And North Carolina [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)		$ 27,025
New Jersey, Ohio And Indiana [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)		2,643
Pennsylvania [Member]
Water And Wastewater Rates [Line Items]
Requested rate increase	$ 97,685
Base rate increase designed to increase total operating revenues on an annual basis	17.90%
Kentucky [Member]
Water And Wastewater Rates [Line Items]
Distribution system improvement charges		586
Base rate increase (decrease)		$ 747