COMMITMENTS AND CONTINGENCIES - Offshore Wind Sale and Contingent Liability Narrative (Details) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Sep. 30, 2024	Jul. 09, 2024	Mar. 31, 2026	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Equity method investment, liability obligations					$ 365.0
Contingent consideration liability			$ 298.2			$ 448.2
Sunrise Wind, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)		50.00%
Proceeds from sale of equity method investments		$ 118.0
Sunrise Wind, LLC | Orsted
Schedule of Equity Method Investments [Line Items]
Equity method investment, remaining purchase price paid		$ 34.0
Sunrise Wind, LLC | Orsted
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)		50.00%
Proceeds from sale of equity method investments		$ 152.0
South Fork Wind And Revolution Wind
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	50.00%
Proceeds from sale of equity method investments	$ 745.0
Cost sharing agreement, threshold amount	$ 240.0
Equity method investment, other than temporary impairment, after tax					524.0
Effective income tax rate reconciliation, change in enacted tax rate, amount					$ 60.0
Equity method investment, pre tax charge				$ 284.0
Revolution Wind
Schedule of Equity Method Investments [Line Items]
Federal investment tax credits (percent)			40.00%
Commercial operation, term			4 years