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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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