INVESTMENTS IN UNCONSOLIDATED AFFILIATES - Summary of Investments Under the Equity Method (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Investments in Unconsolidated Affiliates	$ 166.2	$ 168.7
Tax Equity Investment in South Fork Wind
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)	100.00%
Investments in Unconsolidated Affiliates	$ 19.1	22.2
Tax Equity Investment in South Fork Wind | Minimum
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	$ 110.8	112.6
Other
Schedule of Equity Method Investments [Line Items]
Investments in Unconsolidated Affiliates	$ 36.3	$ 33.9