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Related Party Transactions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 millions202020192018
Transactions with the Service Company
Charges for services provided$38.8 $33.8 $41.0 
Charges to the Service Company$4.2 $3.6 $4.9 
Transactions with other AES affiliates:
Payments for health, welfare and benefit plans$10.7 $11.2 $7.9 
Consulting and other services$0.8 $0.7 $2.0 
Balances with related parties:At December 31, 2020At December 31, 2019
Net payable to the Service Company$(14.8)$(11.0)
Net receivable from / (payable to) AES and other AES affiliates (a)$(1.7)$2.0 

(a)The December 31, 2019 net receivable amount includes a $5.1 million receivable balance with AES related to the sale of software previously recorded on AES Ohio Generation during the year ended December 31. 2019. There was no gain or loss recorded on the transaction. These $5.1 million of proceeds on the sale were received in 2020.
    
Other Investments $ 0.2 $ 0.2  
Deferred Compensation Arrangement with Individual, Compensation Expense 0.1 0.0 $ 0.4
Sales to related party 4.2 3.6 4.9
Charges for Services Provided 38.8 33.8 41.0
Net payable to the Service Company (14.8) (11.0)  
Due to Affiliate (1.7) 2.0  
Proceeds from Sale of Property, Plant, and Equipment 5.1 0.0 10.6
Other comprehensive loss before reclassifications (8.8) (4.5)  
Amounts reclassified from accumulated other comprehensive income / (loss) to earnings 0.1 (1.3)  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Related Party Transaction [Line Items]      
Other comprehensive loss before reclassifications (8.8) (3.5)  
Amounts reclassified from accumulated other comprehensive income / (loss) to earnings 1.0 0.2  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Related Party Transaction [Line Items]      
Other comprehensive loss before reclassifications 0.0 (1.0)  
Amounts reclassified from accumulated other comprehensive income / (loss) to earnings $ (0.9) (1.5)  
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 millions202020192018
DP&L Operation & Maintenance Expenses:
Premiums charged for insurance services
provided by MVIC (a)
$3.4 $3.1 $2.7 
Transactions with the Service Company:
Charges for services provided$37.5 $31.2 $25.7 
Charges to the Service Company$4.1 $3.5 $4.9 
Transactions with other AES affiliates:
Charges for health, welfare and benefit plans$10.1 $10.4 $8.7 
Charges to affiliates for non-power goods or services (b)
$4.1 $4.1 $7.1 
Consulting and other services$0.8 $0.7 $2.0 
Balances with related parties:At December 31, 2020At December 31, 2019
Net payable to the Service Company$(14.8)$(11.0)
Net payable to AES and other AES affiliates$(2.1)$(3.5)

(a)    MVIC, a wholly-owned captive insurance subsidiary of DPL, provides insurance coverage to DP&L 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 DP&L.
(b)    In the normal course of business DP&L 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. DP&L subsequently charged these expenses to the affiliates at DP&L’s cost and credited the expense in which they were initially recorded.
    
Deferred Compensation Arrangement with Individual, Compensation Expense $ 0.1 (0.3) 0.3
Sales to related party 4.1 3.5 4.9
Charges for Services Provided 37.5 31.2 25.7
Net payable to the Service Company (14.8) (11.0)  
Premiums paid for Insurance Services provided by MVIC 3.4 3.1 2.7
Due to Affiliate 2.1 3.5  
Proceeds from Sale of Property, Plant, and Equipment 0.0 0.0 10.6
Other comprehensive loss before reclassifications (8.9) (4.4)  
Amounts reclassified from accumulated other comprehensive income / (loss) to earnings 3.7 2.8  
THE DAYTON POWER AND LIGHT COMPANY [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Related Party Transaction [Line Items]      
Other comprehensive loss before reclassifications (8.7) (3.6)  
Amounts reclassified from accumulated other comprehensive income / (loss) to earnings 3.1 3.0  
THE DAYTON POWER AND LIGHT COMPANY [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Related Party Transaction [Line Items]      
Other comprehensive loss before reclassifications (0.2) (0.8)  
Amounts reclassified from accumulated other comprehensive income / (loss) to earnings 0.6 (0.2)  
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  
Receivable from sale of software to AES [Member]      
Related Party Transaction [Line Items]      
Amounts due from affiliates   5.1  
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 22.5 14.6
Charges for health, welfare and benefit plans [Member] | Subsidiary of Common Parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 10.7 11.2 7.9
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 10.1 10.4 8.7
Consulting Services [Member] | Subsidiary of Common Parent [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Amounts of Transaction 0.8 0.7 2.0
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 0.8 0.7 2.0
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 $ 4.1 $ 4.1 $ 7.1