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Capitalization (Narrative) (Details) - USD ($) $ in Thousands					3 Months Ended	9 Months Ended
	Aug. 07, 2025	Jun. 03, 2025	Mar. 19, 2025	Aug. 13, 2024	Sep. 30, 2025	Sep. 30, 2025	May 29, 2025	Sep. 30, 2024
At Market Sales Agreements 2024 [Member]
Debt Instrument [Line Items]
Common stock shares future issuance and sale at aggregate offering price				$ 1,000,000
Sale of stock, shares					2,379,579	7,671,350
Common stock issued					$ 91,500	$ 300,100
Stock remaining available for sale, amount					660,700	660,700		$ 660,700
First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Face Amount							$ 100,000
Commercial Paper Program [Member]
Debt Instrument [Line Items]
Net of unamortized discount on issuance					$ 18	$ 18
Weighted average interest rate					4.35%	4.35%
Weighted average remaining term						2 days
Face Amount					$ 152,982	$ 152,982
First Mortgage Bonds Due In 2035 [Member]
Debt Instrument [Line Items]
Face Amount							$ 75,000
Debt instrument, interest rate							5.38%
First Mortgage Bonds Due In 2040 [Member]
Debt Instrument [Line Items]
Face Amount							$ 25,000
Debt instrument, interest rate							5.63%
Senior Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of senior notes	$ 500,000
Less expense on issuance of notes	$ 1,220
Maturity						Aug. 15, 2035
Debt instrument, interest rate					5.25%	5.25%
Maximum [Member] \| Commercial Paper [Member]
Debt Instrument [Line Items]
Borrowing capacity through private placement			$ 1,000,000
Maturities of commercial paper term			364 days
Maximum [Member] \| Aqua Pennsylvania, Inc [Member]
Debt Instrument [Line Items]
Borrowing capacity through private placement		$ 100,000
Maturities of commercial paper term		364 days
Maximum [Member] \| Peoples Natural Gas Companies [Member]
Debt Instrument [Line Items]
Borrowing capacity through private placement		$ 300,000
Maturities of commercial paper term		364 days