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Fair Value (Narrative) (Details)
MWh in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
MWh
Dec. 31, 2019
USD ($)
Entity Information [Line Items]    
Revisions to cash flow and timing estimates $ 1,120 $ 78,153
Debt Issuance Costs, Net 26,000 20,700
Unamortized debt discount 6,600 6,500
Asset retirement obligations 195,236 204,219
Regulatory assets 392,801 355,614
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]    
Entity Information [Line Items]    
Derivative, Notional Amount, Purchase (Sales), Net 400,000  
Purchase of Derivative Instruments Interest Rate Swap 400,000  
Sale of Derivative Instruments Interest Rate Swap $ 0  
FTR [Member] | Not Designated as Hedging Instrument [Member]    
Entity Information [Line Items]    
Sale of Units Derivative Instruments Financial Transmission Rights | MWh 0  
Petersburg Unit 1 retirement    
Entity Information [Line Items]    
Regulatory assets $ 74,545 0
Indianapolis Power And Light Company    
Entity Information [Line Items]    
Revisions to cash flow and timing estimates 1,120 78,153
Debt Issuance Costs, Net 17,400 16,700
Unamortized debt discount 6,006 6,156
Asset retirement obligations 195,236 204,219
Regulatory assets $ 392,801 355,614
Indianapolis Power And Light Company | FTR [Member] | Not Designated as Hedging Instrument [Member]    
Entity Information [Line Items]    
Sale of Units Derivative Instruments Financial Transmission Rights | MWh 0  
Indianapolis Power And Light Company | Petersburg Unit 1 retirement    
Entity Information [Line Items]    
Regulatory assets $ 74,545 $ 0