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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Charges from Service Company      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 66.9 $ (51.3) $ (43.9)
Charges from Service Company | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 66.2 (50.5) (43.2)
Charges to the Service Company      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction (4.1) (3.0) (4.0)
Charges to the Service Company | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ (4.1) (3.0) (4.0)
Schedule of Related Party Transactions
The following table provides a summary of our related party transactions:
Years ended December 31,
$ in millions202420232022
Transactions included in Operation and Maintenance on the Consolidated Statements of Operations:
Charges from the Service Company
$66.9 $51.3 $43.9 
Charges to the Service Company
$(4.1)$(3.0)$(4.0)
Services provided by AES and other AES affiliates$22.3 $16.8 $16.5 
Services provided by other related parties$1.9 $1.7 $2.5 
Transactions primarily included in Net property, plant and equipment and Intangible assets, net on the Consolidated Balance Sheets:
Charges from the Service Company
$54.6 $31.8 $21.6 
Balances with related parties (included in Accounts Payable):
At December 31, 2024At December 31, 2023
Net payable to the Service Company$(26.9)$(3.9)
   
Other Investments $ 0.1 0.2  
Accounts payable 132.1 163.9  
Income Taxes Receivable, Current $ 27.1 8.9  
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 millions202420232022
The following transactions are included in Operation and Maintenance on the Statements of Operations:
Charges from the Service Company
$66.2 $50.5 $43.2 
Charges to the Service Company
$(4.1)$(3.0)$(4.0)
Services provided by AES and other AES affiliates$37.6 $32.2 $28.1 
Services provided by other related parties$1.9 $1.7 $2.5 
Transactions primarily included in Net property, plant and equipment and Intangible assets, net on the Balance Sheets:
Charges from the Service Company
$54.6 $31.8 $21.6 
Balances with related parties (include in Accounts Receivable, net and Accounts Payable):
At December 31, 2024At December 31, 2023
Net payable to the Service Company$(26.9)$(3.9)
Net receivable from / (payable to) AES and other AES affiliates$(0.3)$2.4 
   
Accounts payable $ 132.1 163.8  
Income Taxes Receivable, Current 24.9 24.4  
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 26.9 3.9  
Service Company | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Accounts payable 26.9 3.9  
Affiliated Entity | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Accounts and Other Receivables, Net, Current (0.3) 2.4  
Affiliated Entity      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 22.3 (16.8) (16.5)
Affiliated Entity | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 37.6 (32.2) (28.1)
Other related party      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 1.9 (1.7) (2.5)
Other related party | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 1.9 (1.7) (2.5)
Charges from Service Company - Capital Expenditures      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 54.6 (31.8) (21.6)
Charges from Service Company - Capital Expenditures | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 54.6 $ (31.8) $ (21.6)