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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 millions202220212020
The following transactions are included in Operation and Maintenance on the Consolidated Statements of Operations:
Net charges from the Service Company$39.9 $34.9 $33.2 
Services provided by AES and other AES affiliates$16.5 $15.5 $12.5 
Services provided by other related parties$2.5 $1.6 $1.5 
Balances with related parties (included in Accounts Receivable, net and Accounts Payable):
At December 31, 2022At December 31, 2021
Net payable to the Service Company$(9.8)$(24.7)
Net receivable from AES and other AES affiliates$0.3 $1.6 
Net payable to other related parties$— $(0.8)
   
Other Investments $ 0.2 $ 0.2  
Deferred Compensation Arrangement with Individual, Compensation Expense $ 0.1 0.0 $ 0.1
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 millions202220212020
The following transactions are included in Operation and Maintenance on the Statements of Operations:
Net charges from the Service Company$39.2 $33.9 $32.1 
Services provided by AES and other AES affiliates$28.1 $21.9 $21.2 
Services provided by other related parties$2.5 $1.6 $1.5 
Balances with related parties (include in Accounts Receivable, net and Accounts Payable):
At December 31, 2022At December 31, 2021
Net payable to the Service Company$(9.8)$(24.7)
Net payable to AES and other AES affiliates$1.2 $1.8 
Net payable to other related parties$— $(0.8)
   
Deferred Compensation Arrangement with Individual, Compensation Expense $ 0.1 0.0 0.1
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, Related Parties, Current (9.8) (24.7)  
Service Company | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Accounts Payable, Related Parties, Current (9.8) (24.7)  
Affiliated Entity      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current 0.3 1.6  
Affiliated Entity | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Accounts Receivable, Related Parties, Current (1.2) (1.8)  
Other related party      
Related Party Transaction [Line Items]      
Accounts Payable, Related Parties, Current 0.0 (0.8)  
Other related party | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Accounts Payable, Related Parties, Current 0.0 (0.8)  
Service Company      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 39.9 34.9 33.2
Service Company | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 39.2 33.9 32.1
Affiliated Entity      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 16.5 15.5 12.5
Affiliated Entity | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 28.1 21.9 21.2
Other related party      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 2.5 1.6 $ 1.5
Other related party | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 2.5 $ 1.6