COMMON SHARES - Narrative (Details) - USD ($) $ in Thousands				12 Months Ended
	Oct. 03, 2022	May 11, 2022	Dec. 01, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Maximum amount of stock to be issued		$ 1,200,000
Equity offering (in shares)				2,165,671
Consideration received from sale of stock				$ 197,100
Treasury stock (in shares)				11,540,218	13,415,206
Common stock outstanding (in shares)				348,443,855	344,403,196
Issuance of treasury shares for acquisition			$ 38,100	$ 72,133	$ 38,051
Subsidiaries | The Torrington Water Company (TWC)
Class of Stock [Line Items]
Purchase price	$ 72,100
Common Shares
Class of Stock [Line Items]
Common stock outstanding (in shares)				348,443,855	344,403,196	342,954,023	329,880,645
Issuance of treasury shares for acquisition (in shares)			462,517	925,264	462,517