Capitalization (Details)							1 Months Ended		3 Months Ended	6 Months Ended		18 Months Ended
	Jun. 30, 2022 USD ($) $ / shares shares	May 20, 2022 USD ($)	May 02, 2022 $ / shares shares	Aug. 09, 2021 USD ($) $ / agreement shares	Apr. 19, 2021 USD ($)	Apr. 23, 2019 USD ($) $ / shares	Apr. 30, 2022 shares	Aug. 31, 2020 USD ($) shares	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 29, 2022 USD ($)	Dec. 31, 2021 $ / shares shares	Apr. 15, 2021 USD ($)
Debt Instrument [Line Items]
Common stock, par value | $ / shares	$ 0.50								$ 0.50	$ 0.50		$ 0.50		$ 0.50
Common stock, shares authorized | shares	600,000,000								600,000,000	600,000,000		600,000,000		600,000,000
Issuance of common stock from forward equity sale agreement				$ 299,739,000
Issuance of common stock from forward equity sale agreement , shares | shares				6,700,000
Stock purchase contracts early settled by holders of the contracts | shares							981,919
Shares settled | shares			6,621,315				1,166,107
Issuance of common stock from stock purchase contracts , shares | shares			7,863,354						9,029,461
Conversion to shares | $ / shares			$ 1.18758
Repayments of long-term debt										$ 464,585,000	$ 619,477,000
Initial Forward Equity Sale Agreement [Member]
Debt Instrument [Line Items]
Forward price | $ / agreement				46.00
Forward Equity Sale Agreement [Member]
Debt Instrument [Line Items]
Proceeds from private placement								$ 0
Common stock, shares authorized | shares								6,700,000
Forward price | $ / agreement				44.74
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Repayment of line of credit		$ 410,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maturity	Jun. 29, 2023
Borrowing capacity	$ 300,000,000								$ 300,000,000	$ 300,000,000		$ 300,000,000	$ 100,000,000
Debt term		5 years
Notes at 5.30%, due 2052
Debt Instrument [Line Items]
Maturity date												2052
Debt issuance expense		$ 5,815,000
Maturity Year		2052
Interest Rate	5.30%	5.30%							5.30%	5.30%		5.30%		5.30%
Unsecured notes payable	$ 500,000,000	$ 500,000,000							$ 500,000,000	$ 500,000,000		$ 500,000,000
Long-Term Debts [Member]
Debt Instrument [Line Items]
Face Amount					$ 400,000,000
Debt issuance expense					$ 4,010,000
Interest Rate					2.40%
Aqua Ohio, Inc [Member] | Mortgage Bonds [Member]
Debt Instrument [Line Items]
Face Amount															$ 100,000,000
Aqua Ohio, Inc [Member] | Mortgage Bonds Due 2031 [Member]
Debt Instrument [Line Items]
Face Amount															$ 50,000,000
Interest Rate															2.37%
Aqua Ohio, Inc [Member] | Mortgage Bonds Due 2051 [Member]
Debt Instrument [Line Items]
Face Amount															$ 50,000,000
Interest Rate															3.35%
Aqua Pennsylvania, Inc [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt term					5 years
Repayments of long-term debt					$ 50,000,000
Repayment of line of credit		$ 49,700,000
LDC Funding LLC [Member]
Debt Instrument [Line Items]
Private placement, per share | $ / shares						$ 50.00
Proceeds from tangible equity units						$ 690,000,000
Initial principal amount						$ 119,081,000
Initial principal amount per share | $ / shares						$ 8.62909
Cash installment | $ / shares						$ 0.75
Cash installment rate						6.00%
Debt issuance expense						$ 16,358,000
Interest Rate						3.00%
LDC Funding LLC [Member] | July 30, 2019 [Member]
Debt Instrument [Line Items]
Cash installment | $ / shares						$ 0.80833