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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 |  |  |  |  |  |

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