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COMMON EQUITY - COMMON STOCK ISSUED (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 11 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Aug. 31, 2024
Capital Unit [Line Items]                
Shares issued - At-the-market offering program 2,526,543   0   3,504,367 0    
Issuance of common stock, net $ 281.7 $ 117.1 $ 19.0 $ 19.2 $ 398.8 $ 38.2    
Roll Forward of Common Stock Outstanding                
Common Stock, Shares, Outstanding, Beginning Balance 319,133,501 317,680,855 315,822,587 315,434,531 317,680,855 315,434,531    
Shares issued - At-the-market offering program 2,526,543   0   3,504,367 0    
Shares Issued - Stock-based compensation 47,403   20,488   390,114 162,666    
Shares Issued - 401(k) 71,800   122,300   115,100 246,600    
Shares Issued - Stock investment plan 87,148   114,026   175,959 235,604    
Common Stock, Shares, Outstanding, Ending Balance 321,866,395 319,133,501 316,079,401 315,822,587 321,866,395 316,079,401 321,866,395  
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             4,535,041  
Issuance of common stock, net             $ 466.0  
Payments of Stock Issuance Costs             $ 5.7  
Roll Forward of Common Stock Outstanding                
Shares issued - At-the-market offering program             4,535,041