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COMMON EQUITY - COMMON STOCK ISSUED (Details) - USD ($)
$ in Millions
 3 Months Ended 8 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Aug. 31, 2024
Capital Unit [Line Items]        
Shares issued - At-the-market offering program 977,824 0    
Issuance of common stock, net $ 117.1 $ 19.2    
Roll Forward of Common Stock Outstanding        
Common Stock, Shares, Outstanding, Beginning Balance 317,680,855 315,434,531    
Shares issued - At-the-market offering program 977,824 0    
Shares Issued - Stock-based compensation 342,711 142,178    
Shares Issued - 401(k) 43,300 124,300    
Shares Issued - Stock investment plan 88,811 121,578    
Common Stock, Shares, Outstanding, Ending Balance 319,133,501 315,822,587 319,133,501  
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     2,008,498  
Issuance of common stock, net     $ 201.4  
Payments of Stock Issuance Costs     $ 2.8  
Roll Forward of Common Stock Outstanding        
Shares issued - At-the-market offering program     2,008,498