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Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Stockholders' Equity Note Disclosure     EQUITY
During the nine months ended September 30, 2023, DPL received $260.0 million in cash contributions from AES, and DPL made $260.0 million in equity contributions to AES Ohio. The cash contributions at DPL represented equity contributions of $239.0 million and payments of $21.0 million against the tax receivable.

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     $ 260.0  
Proceeds from Contributions from Parent $ 127.0 $ 112.0 239.0 $ 0.0
Payment against tax receivable balance from Parent     $ 21.0  
Subsidiaries [Member]        
Stockholders' Equity Note Disclosure     EQUITYDuring the nine months ended September 30, 2023, DPL made equity contributions of $260.0 million to AES Ohio.  
Proceeds from Contributions from Parent $ 135.0 $ 125.0 $ 260.0 $ 0.0