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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 millions202120202019
Transactions with the Service Company
Net charges for services provided$39.2 $34.6 $30.2 
Transactions with other AES affiliates:
Payments for health, welfare and benefit plans$13.9 $10.7 $11.2 
Consulting and other services$1.4 $0.8 $0.7 
Balances with related parties:At December 31, 2021At December 31, 2020
Net payable to the Service Company$(24.7)$(14.8)
Net receivable from / (payable to) AES and other AES affiliates$0.7 $(1.7)
   
Other Investments $ 0.2 $ 0.2  
Deferred Compensation Arrangement with Individual, Compensation Expense 0.0 0.1 $ 0.0
Net payable to the Service Company (24.7) (14.8)  
Due to Affiliate $ 0.7 (1.7)  
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 millions202120202019
AES Ohio Operation & Maintenance Expenses:
Premiums charged for insurance services provided by MVIC (a)
$3.3 $3.4 $3.1 
Transactions with the Service Company:
Net charges for services provided$38.1 $33.4 $27.7 
Transactions with other AES affiliates:
Charges for health, welfare and benefit plans$10.5 $10.1 $10.4 
Charges to affiliates for non-power goods or services (b)
$5.8 $4.1 $4.1 
Consulting and other services$1.4 $0.8 $0.7 
Balances with related parties:At December 31, 2021At December 31, 2020
Net payable to the Service Company$(24.7)$(14.8)
Net receivable from / (payable to) AES and other AES affiliates$0.5 $(2.1)

(a)    MVIC, a wholly-owned captive insurance subsidiary of DPL, provides insurance coverage to AES Ohio and other DPL subsidiaries for workers’ compensation, general liability, property damages and directors’ and officers’ liability. These amounts represent insurance premiums charged by MVIC to AES Ohio.
(b)    In the normal course of business AES Ohio incurred and recorded expenses on behalf of DPL affiliates. Such expenses included but were not limited to employee-related expenses, accounting, information technology, payroll, legal and other administration expenses. AES Ohio subsequently charged these expenses to the affiliates at AES Ohio’s cost and credited the expense in which they were initially recorded.
   
Deferred Compensation Arrangement with Individual, Compensation Expense $ 0.0 0.1 (0.3)
Net payable to the Service Company (24.7) (14.8)  
Premiums paid for Insurance Services provided by MVIC 3.3 3.4 3.1
Due to Affiliate (0.5) 2.1  
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  
Income Taxes Paid, Net [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 0.0 0.0 22.5
Charges for health, welfare and benefit plans [Member] | Subsidiary of Common Parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 13.9 10.7 11.2
Charges for health, welfare and benefit plans [Member] | Subsidiary of Common Parent [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 10.5 10.1 10.4
Consulting Services [Member] | Subsidiary of Common Parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 1.4 0.8 0.7
Consulting Services [Member] | Subsidiary of Common Parent [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 1.4 0.8 0.7
Charges for affiliates for non-power goods or services [Member] | Subsidiary of Common Parent [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 5.8 4.1 4.1
Service Company      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 39.2 34.6 30.2
Service Company | THE DAYTON POWER AND LIGHT COMPANY [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction $ 38.1 $ 33.4 $ 27.7