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COMMON EQUITY - COMMON STOCK ISSUED (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		14 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Aug. 31, 2024
Capital Unit [Line Items]
Shares issued - At-the-market offering program	3,075,416			0			6,579,783	0
Issuance of common stock, net	$ 347.8	$ 281.7	$ 117.1	$ 12.8	$ 19.0	$ 19.2	$ 746.6	$ 51.0
Roll Forward of Common Stock Outstanding
Common Stock, Shares, Outstanding, Beginning Balance	321,866,395		317,680,855	316,079,401		315,434,531	317,680,855	315,434,531
Shares issued - At-the-market offering program	3,075,416			0			6,579,783	0
Shares Issued - Stock-based compensation	196,997			137,936			587,111	300,602
Shares Issued - 401(k)	70,200			38,400			185,300	285,000
Shares Issued - Stock investment plan	85,244			98,709			261,203	334,313
Common Stock, Shares, Outstanding, Ending Balance	325,294,252	321,866,395		316,354,446	316,079,401		325,294,252	316,354,446	325,294,252
At-the-market program offering
Capital Unit [Line Items]
Maximum aggregate sales of common stock through ATM Program										$ 1,500.0
Shares issued - At-the-market offering program									7,610,457
Issuance of common stock, net									$ 797.3
Payments of Stock Issuance Costs									$ 9.2
Roll Forward of Common Stock Outstanding
Shares issued - At-the-market offering program									7,610,457

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