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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | May 25, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 2,723,931 |  | $ 2,176,080
Offshore Wind Business |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (percent) | 50.00% | 50.00% |
Investments in unconsolidated affiliates | $ 2,578,600 |  | 1,947,100
Natural Gas Pipeline - Algonquin Gas Transmission, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (percent) | 15.00% |  |
Investments in unconsolidated affiliates | $ 116,800 |  | 118,800
Renewable Energy Investment Fund |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (percent) | 90.00% |  |
Investments in unconsolidated affiliates | $ 0 |  | 84,100
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 28,500 |  | $ 26,100

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