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Equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Apr. 09, 2025
Apr. 04, 2025
Dec. 31, 2024
Dec. 31, 2023
Stockholders' Equity Note Disclosure        
8. EQUITY

Transactions with Holders of Redeemable Stock of Subsidiaries
On April 4, 2025, DPL sold an aggregate indirect equity interest in AES Ohio of approximately 30% to Astrid Holdings LP, a wholly-owned subsidiary of CDPQ, for total proceeds of approximately $544 million, resulting in an increase to Redeemable stock of subsidiaries of $537.5 million, net of transaction costs on the Condensed
Consolidated Balance Sheets. The agreement contains certain redemption features that, while not currently in effect, are not solely in DPL's control. As a result, the noncontrolling ownership interest is considered temporary equity. The Company has concluded that the likelihood of an event that would allow CDPQ to redeem its interest under the terms of the shareholder agreement is remote, but would require redemption at fair value. Therefore, as of June 30, 2025, the noncontrolling ownership interest is not probable of becoming redeemable and subsequent adjustments to the carrying value were not required. The transaction also resulted in reclassification of $2.7 million of pension related AOCL to Member's equity. As DPL maintained control after the transaction, AES Ohio continues to be consolidated by DPL.

On April 9, 2025, CDPQ made capital contributions totaling $45.0 million as part of a capital call primarily for funding needs related to AES Ohio’s capital expenditure program. The capital contributions were made on a proportional share basis and, therefore, did not change CDPQ’s or DPL’s ownership interests in Ohio Investments or Ohio Holdings.

Other Paid-in Capital
During the six months ended June 30, 2024, DPL received $130.0 million in equity contributions from AES. DPL then made the same investments in AES Ohio. The proceeds from these equity contributions allow AES Ohio to seek to improve its infrastructure and modernize its grid while maintaining liquidity.
          
Cash Contribution from Parent Company           $ 130,000,000        
Proceeds from Contributions from Parent     $ 130,000,000.0   $ 0 130,000,000.0        
Proceeds from Issuance of Redeemable Convertible Preferred Stock $ 2,700,000       540,600,000 0        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 393,400,000 $ 364,800,000 291,300,000 $ 151,300,000 393,400,000 291,300,000     $ 362,100,000 $ 148,900,000
Members' Equity 3,048,400,000       3,048,400,000          
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 200,000                  
Other Comprehensive Income (Loss), Net of Tax 0   (200,000) (200,000) 0 (400,000)        
Proceeds from Issuance of Common Stock 45,000,000.0       45,000,000.0 0        
Proceeds from Noncontrolling Interests 537,500,000                  
Net Income (Loss) Attributable to Parent 700,000 2,700,000 10,200,000 2,600,000 3,400,000 12,800,000        
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest (1,600,000)   0   (1,600,000) 0        
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (200,000)                  
Redeemable Noncontrolling Interest, Equity, Carrying Amount 584,300,000       584,300,000       0  
Equity                    
Members' Equity (2,700,000)       $ (2,700,000)          
AOCI Attributable to Parent [Member]                    
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent $ 2,700,000                  
Common Stock [Member]                    
Shares, Issued 1       1          
Equity                    
Members' Equity $ 3,040,500,000       $ 3,040,500,000          
Operating Segments [Member] | Utility [Member]                    
Net Income (Loss) Attributable to Parent     15,100,000     24,500,000        
CDPQ                    
General Partners' Contributed Capital             $ 45,000,000      
Other Additional Capital [Member]                    
Proceeds from Contributions from Parent     130,000,000.0              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 0 3,040,500,000 2,970,400,000 2,840,400,000 0 2,970,400,000     3,040,500,000 2,840,400,000
Common Stock [Member]                    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 0 $ 0 $ 0 $ 0 $ 0 $ 0     $ 0 $ 0
Shares, Issued 0 1 1 1 0 1     1 1
Subsidiaries [Member]                    
CDPQ Investment total               $ 544,000,000    
CDPQ Investment percent               30.00%