Capitalization (Narrative) (Details) - USD ($)							1 Months Ended			3 Months Ended			9 Months Ended	12 Months Ended
	Jun. 29, 2023	Dec. 14, 2022	Oct. 14, 2022	May 20, 2022	May 02, 2022	Apr. 23, 2019	Jan. 31, 2023	Oct. 31, 2022	Apr. 30, 2022	Sep. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Aug. 31, 2023
Debt Instrument [Line Items]
Issuance of common stock from forward equity sale agreement			$ 500,000,000
Stock purchase contracts early settled by holders of the contracts									981,919
Shares settled					6,621,315				1,166,107
Issuance of common stock from stock purchase contracts , shares					7,863,354							9,029,461
Conversion to shares					$ 1.18758
At Market Sales Agreements [Member]
Debt Instrument [Line Items]
Sale of stock, shares										8,539,711	1,321,994		8,938,839
Common stock issued										$ 303,689,000	$ 63,040,000		$ 322,983,000
Stock remaining available for sale, amount										$ 110,000,000			$ 110,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt term				5 years
Repayment of line of credit				$ 410,000,000
First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Face Amount																$ 225,000,000
First Mortgage Bonds Due In 2053 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate																5.48%
Face Amount																$ 175,000,000
First Mortgage Bonds Due In 2061 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate																5.56%
Face Amount																$ 50,000,000
Notes At 5.30%, Due 2052 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate				5.30%						5.30%	5.30%		5.30%	5.30%
Maturity date													2052	2052
Debt issuance expense				$ 5,815,000
Maturity Year				2052
Unsecured notes payable				$ 500,000,000						$ 500,000,000	$ 500,000,000		$ 500,000,000	$ 500,000,000
Amended Unsecured Facility [Member]
Debt Instrument [Line Items]
Debt term	364 days
Unsecured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity										635,664			635,664
Amount borrowed		$ 1,000,000								347,000			347,000		$ 1,000,000
Debt term		5 years													5 years
Sublimit for daily demand loans		$ 100,000
Unsecured Debt [Member] | Letter Of Credit Sublimit [Member]
Debt Instrument [Line Items]
Borrowing capacity										100,000			100,000
Unsecured Debt [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity										82,664			82,664
Unsecured Debt [Member] | Swing Line Commitment [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity										100,000			100,000
Amount borrowed										$ 0			$ 0
Aqua Pennsylvania, Inc [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate							5.60%	4.50%
Face Amount							$ 75,000,000	$ 125,000,000
Maturity Year							2043	2052
Aqua Pennsylvania, Inc [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayment of line of credit				$ 49,700,000
Aqua Pennsylvania, Inc [Member] | Amended Unsecured Facility [Member]
Debt Instrument [Line Items]
Amount borrowed	$ 100,000,000
LDC Funding LLC [Member]
Debt Instrument [Line Items]
Private placement, per share						$ 50.00
Proceeds from tangible equity units						$ 690,000,000
Debt instrument, interest rate						3.00%
Initial principal amount						$ 119,081,000
Initial principal amount per share						$ 8.62909
Cash installment						$ 0.75
Cash installment rate						6.00%
Debt issuance expense						$ 16,358,000
LDC Funding LLC [Member] | July 30, 2019 [Member]
Debt Instrument [Line Items]
Cash installment						$ 0.80833
Peoples Gas Acquisition [Member] | Amended Unsecured Facility [Member]
Debt Instrument [Line Items]
Amount borrowed	$ 300,000,000