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Shareholder's Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]              
Stockholders' Equity Note Disclosure         Shareholder's Deficit
Capital Contributions from AES
There were no capital contributions during the nine months ended September 30, 2021.

During the nine months ended September 30, 2020, DPL received $150.0 million in a cash contribution from AES, which DPL then used to make a $150.0 million capital contribution to AES Ohio. The contribution at DPL represented an equity capital contribution of $98.0 million and a payment of $52.0 million against its tax receivable. The proceeds from the capital contribution at AES Ohio will primarily be used for funding needs to support AES Ohio's capital expenditure program, mainly new investments in and upgrades to AES Ohio’s transmission and distribution system.
    
Non-cash capital contribution       $ 98.0      
Common Stock, Shares Authorized 1,500       1,500   1,500
Proceeds from Contributions from Parent         $ 0.0 $ 98.0  
Cash Contribution from Parent Company           150.0  
Payment against tax receivable balance from Parent           52.0  
Proceeds from Contributions from Parent         $ 0.0 98.0  
Other Additional Capital [Member]              
Class of Stock [Line Items]              
Non-cash capital contribution       98.0      
Subsidiaries [Member]              
Class of Stock [Line Items]              
Stockholders' Equity Note Disclosure         Shareholder's Equity
Capital Contribution and Returns of Capital
During the nine months ended September 30, 2021, AES Ohio made return of capital payments of $27.0 million to DPL, of which $17.0 million was declared in 2021.

During the nine months ended September 30, 2020, DPL made a capital contribution of $150.0 million to AES Ohio. The proceeds are primarily being used to support AES Ohio's capital expenditure program, consisting primarily of investments in and upgrades to AES Ohio’s transmission and distribution system. Additionally, AES
Ohio declared return of capital payments of up to $42.7 million to DPL, of which $27.7 million was paid during the period. 		   
Common Stock, Shares Authorized 50,000,000       50,000,000   50,000,000
Par value common shares (in USD per share) $ 0.01       $ 0.01   $ 0.01
Common Stock, Shares, Outstanding 41,172,173       41,172,173   41,172,173
Proceeds from Contributions from Parent       150.0 $ 0.0 150.0  
Dividends, Common Stock, Cash $ (10.0) $ (7.0) $ (28.5) (14.2)   (42.7)  
Dividends, Common Stock, Cash 10.0 7.0 28.5 14.2   42.7  
Payments of Ordinary Dividends, Common Stock         27.0 27.7  
Proceeds from Contributions from Parent       150.0 0.0 $ 150.0  
Subsidiaries [Member] | Other Additional Capital [Member]              
Class of Stock [Line Items]              
Proceeds from Contributions from Parent       150.0      
Dividends, Common Stock, Cash (10.0) (7.0) (28.5) (14.2) (17.0)    
Dividends, Common Stock, Cash $ 10.0 $ 7.0 $ 28.5 14.2 $ 17.0    
Proceeds from Contributions from Parent       $ 150.0