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ACQUISITIONS AND DISPOSITIONS - Narrative (Details)
$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
facility
Jun. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Feb. 29, 2024
USD ($)
Sep. 30, 2025
USD ($)
facility
Sep. 30, 2024
USD ($)
Aug. 31, 2025
May 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from noncontrolling interests, net         $ 2,782.9 $ 0.0    
AEP OnSite Partners | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of businesses     $ 318.0          
NMRD | Disposal Group, Disposed of by Sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of businesses       $ 107.0        
Ohio Transmission And Indiana Michigan Transmission                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Subsidiary, ownership percentage, parent   19.90%            
Proceeds from noncontrolling interests, gross   $ 2,820.0            
Proceeds from noncontrolling interests, net   $ 2,780.0            
VIU | Pixley | PSO                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Percentage of shares acquired               100.00%
VIU | Flat Ridge IV | PSO                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Percentage of shares acquired   100.00%            
VIU | Green Country | PSO                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Percentage of shares acquired   100.00%            
Asset acquisition, property, plant and equipment   $ 819.0            
Asset acquisition, intangible liability   41.0            
Asset acquisition, regulatory liability   $ 50.0            
VIU | Wind Energy, LLC | PSO                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Percentage of shares acquired             100.00%  
VIU | Four Electric Generation Facilities | PSO                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of properties | facility 4       4      
Payments to acquire plant $ 1,700.0