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Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 22, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Stockholders' Equity Note Disclosure      
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. DPL also received an additional equity contribution of $70.0 million from AES in July 2024. DPL then made the same investment in AES Ohio.
  
Cash Contribution from Parent Company       $ 130.0 $ 125.0
Proceeds from Contributions from Parent   $ 130.0 $ 112.0 $ 130.0 112.0
Payment against tax receivable balance from Parent         13.0
Subsidiaries [Member]          
Stockholders' Equity Note Disclosure       SHAREHOLDER'S EQUITY
During the six months ended June 30, 2024, DPL made equity contributions to AES Ohio of $130.0 million. AES Ohio also received an additional equity contribution of $70.0 million from DPL in July 2024.
During the six months ended June 30, 2023, DPL made equity contributions of $125.0 million to AES Ohio.

The proceeds from these equity contributions allow AES Ohio to seek to improve its infrastructure and modernize its grid while maintaining liquidity.
  
Proceeds from Contributions from Parent   $ 130.0 $ 125.0 $ 130.0 $ 125.0
Subsequent Event          
Cash Contribution from Parent Company $ 70.0