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Capitalization (Narrative) (Details) - USD ($) $ in Thousands				3 Months Ended	6 Months Ended
	Jun. 03, 2025	Mar. 19, 2025	Aug. 13, 2024	Jun. 30, 2025	Jun. 30, 2025	May 29, 2025
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				3,664,762	5,291,771
Common stock issued				$ 145,500	$ 208,600
Stock remaining available for sale, amount				753,000	753,000
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				$ 857	$ 857
Weighted average interest rate				4.69%	4.69%
Weighted average remaining term					13 days
Face Amount				$ 566,543	$ 566,543
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%
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