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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | $ 2,053,404 | $ 1,436,293
Offshore Wind Business - North East Offshore |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest | 50.00% |
Investments in unconsolidated affiliates | $ 1,823,500 | 1,213,600
Natural Gas Pipeline - Algonquin Gas Transmission, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest | 15.00% |
Investments in unconsolidated affiliates | $ 119,600 | 121,900
Renewable Energy Investment Fund |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest | 90.00% |
Investments in unconsolidated affiliates | $ 84,500 | 76,500
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | $ 25,800 | $ 24,300

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