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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 millions202320222021
The following transactions are included in Operation and Maintenance on the Consolidated Statements of Operations:
Net charges from the Service Company$48.3 $39.9 $34.9 
Services provided by AES and other AES affiliates$16.8 $16.5 $15.5 
Services provided by other related parties$1.7 $2.5 $1.6 
Balances with related parties (included in Accounts Receivable, net and Accounts Payable):
At December 31, 2023At December 31, 2022
Net payable to the Service Company$(3.9)$(9.8)
Net receivable from AES and other AES affiliates$— $0.3 
   
Other Investments $ 0.1 $ 0.2  
Accounts payable $ 163.9 129.5  
THE DAYTON POWER AND LIGHT COMPANY [Member]      
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 millions202320222021
The following transactions are included in Operation and Maintenance on the Statements of Operations:
Net charges from the Service Company$47.5 $39.2 $33.9 
Services provided by AES and other AES affiliates$32.2 $28.1 $21.9 
Services provided by other related parties$1.7 $2.5 $1.6 
Balances with related parties (include in Accounts Receivable, net and Accounts Payable):
At December 31, 2023At December 31, 2022
Net payable to the Service Company$(3.9)$(9.8)
Net receivable from AES and other AES affiliates$2.4 $1.2 
   
Accounts payable $ 163.8 129.5  
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 3.9 9.8  
Service Company | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Accounts payable 3.9 9.8  
Affiliated Entity      
Related Party Transaction [Line Items]      
Accounts and Other Receivables, Net, Current 0.0 0.3  
Affiliated Entity | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Accounts and Other Receivables, Net, Current 2.4 1.2  
Service Company      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 48.3 39.9 $ 34.9
Service Company | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 47.5 39.2 33.9
Affiliated Entity      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 16.8 16.5 15.5
Affiliated Entity | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 32.2 28.1 21.9
Other related party      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 1.7 2.5 $ 1.6
Other related party | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 1.7 $ 2.5