INVESTMENTS IN UNCONSOLIDATED AFFILIATES - Summary of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investments in Unconsolidated Affiliates	$ 660,473	$ 2,176,080
Offshore Wind Business
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	50.00%
Investments in Unconsolidated Affiliates	$ 515,500	1,947,100
Offshore Wind Business | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	50.00%
Offshore Wind Business | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	100.00%
Natural Gas Pipeline - Algonquin Gas Transmission, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	15.00%
Investments in Unconsolidated Affiliates	$ 116,000	118,800
Renewable Energy Investment Fund
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	90.00%
Investments in Unconsolidated Affiliates	$ 0	84,100
Other
Schedule of Equity Method Investments [Line Items]
Investments in Unconsolidated Affiliates	$ 29,000	$ 26,100