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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]      
Schedule of Related Party Transactions
The following table provides a summary of our related party transactions:
Years ended December 31,
$ in millions
2025
2024
2023
Transactions included in Operation and Maintenance on the Consolidated Statements of Operations:
Net charges from the Service Company
$
68.7 
$
62.8 
$
48.3 
Services provided by AES and other AES affiliates
$
22.0 
$
22.3 
$
16.8 
Services provided by other related parties
$
0.2 
$
1.9 
$
1.7 
Transactions primarily included in Property, plant and equipment, net and Intangible assets, net on the Consolidated Balance Sheets:
Charges from the Service Company
$
8.5 
$
54.6 
$
31.8 
Charges from other AES affiliates
$
1.9 
$
— 
$
— 
Transactions primarily included in Accounts receivable, net of allowance for credit losses on the Consolidated Balance Sheets
$
1.7 
$
— 
$
— 
Balances with related parties (included in Accounts Payable):
At December 31, 2025
At December 31, 2024
Net payable to the Service Company
$
(4.3)
$
(26.9)
Net receivable from AES and other AES affiliates
$
0.3 
$
— 
   
Other Investments $ 0.1 $ 0.1  
Accounts payable 144.0 132.1  
Income Taxes Receivable, Current $ 24.2 27.1  
Restricted Stock Vest three -year    
Performance Period three-year    
Benefits Vesting three-year    
Note to DPL Capital Trust II Maturing in 2031 - 8.125% [Member]      
Related Party Transaction [Line Items]      
Note payable to trust $ 15.6 15.6  
Service Company      
Related Party Transaction [Line Items]      
Accounts payable 4.3 26.9  
Affiliated Entity      
Related Party Transaction [Line Items]      
Accounts and Other Receivables, Net, Current 0.3 0.0  
Affiliated Entity      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 22.0 (22.3) $ (16.8)
Other related party      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 0.2 (1.9) (1.7)
Charges from Service Company - Capital Expenditures      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 8.5 (54.6) (31.8)
Related Party Included in AR      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 1.7 0.0 0.0
Net charges from Service Company      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 68.7 (62.8) (48.3)
Charges from other AES Affiliates      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 1.9 $ 0.0 $ 0.0