COMMON SHARES - Narrative (Details) - USD ($) $ in Thousands				12 Months Ended
	Oct. 03, 2022	May 11, 2022	Dec. 01, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 03, 2023	May 02, 2023	Dec. 31, 2020
Class of Stock [Line Items]
Maximum amount of stock to be issued		$ 1,200,000
Equity offering (in shares)				0	2,165,671
Consideration received from sale of stock					$ 197,100
Treasury stock, common (in shares)				10,443,807	11,540,218
Common stock outstanding (in shares)				349,540,266	348,443,855
Issuance of treasury shares for acquisition			$ 38,100		$ 72,133	$ 38,051
Authorized (in shares)				410,000,000	380,000,000		410,000,000	380,000,000
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)				349,540,266	348,443,855	344,403,196			342,954,023
Issuance of treasury shares for acquisition (in shares)	925,264		462,517		925,264	462,517