INVESTMENTS IN UNCONSOLIDATED AFFILIATES - Summary of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,176,080	$ 1,436,293
Offshore Wind Business - North East Offshore
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	50.00%
Investments in unconsolidated affiliates	$ 1,947,100	1,213,600
Natural Gas Pipeline - Algonquin Gas Transmission, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	15.00%
Investments in unconsolidated affiliates	$ 118,800	121,900
Renewable Energy Investment Fund
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	90.00%
Investments in unconsolidated affiliates	$ 84,100	76,500
Other
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 26,100	$ 24,300