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Capitalization (Narrative) (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 15, 2024 | Aug. 13, 2024 | Jan. 08, 2024 | Jan. 31, 2023 | Sep. 30, 2024 | Dec. 31, 2023 | Jun. 12, 2024 | Aug. 31, 2023
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 |  |  |  |  | 823,595 |  |  |
Common stock issued |  |  |  |  | $ 32,000 |  |  |
Stock remaining available for sale, amount |  |  |  |  | $ 968,000 |  |  |
At Market Sales Agreements 2022 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Sale of stock, shares |  |  |  |  | 0 | 10,260,833 |  |
Common stock issued |  |  |  |  |  | $ 386,023 |  |
First Mortgage Bonds [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount |  |  |  |  |  |  |  | $ 225,000
First Mortgage Bonds Due In 2053 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 5.48%
Face Amount |  |  |  |  |  |  |  | $ 175,000
First Mortgage Bonds Due In 2061 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 5.56%
Face Amount |  |  |  |  |  |  |  | $ 50,000
Notes At 5.375%, Due 2034 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 5.375% |  | 5.375% |  |  |
Maturity date |  |  |  |  | 2034 |  |  |
Debt issuance expense |  |  | $ 4,610 |  |  |  |  |
Maturity Year |  |  | 2034 |  |  |  |  |
Unsecured notes payable |  |  | $ 500,000 |  | $ 500,000 |  |  |
Notes At 4.80%, Due 2027 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate | 4.80% |  |  |  |  |  |  |
Debt issuance expense | $ 3,015 |  |  |  |  |  |  |
Maturity Year | 2027 |  |  |  |  |  |  |
Unsecured notes payable | $ 500,000 |  |  |  |  |  |  |
Aqua Pennsylvania, Inc [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 5.60% |  |  |  |
Face Amount |  |  |  | $ 75,000 |  |  |  |
Debt term |  |  |  |  | 364 days |  |  |
Maturity Year |  |  |  | 2043 |  |  |  |
Aqua Pennsylvania, Inc [Member] | 364-Day Revolving Credit Agreements [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount |  |  |  |  |  |  | $ 100,000 |
Peoples Natural Gas Companies [Member] | 364-Day Revolving Credit Agreements [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount |  |  |  |  |  |  | $ 300,000 |

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