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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jan. 01, 2016
Related Party Transaction [Line Items]              
Charges for services provided   $ 9.7 $ 8.9 $ 32.8 $ 28.5    
Sales to related party   1.1 1.1 3.4 5.1    
Net payable to the Service Company $ (0.5) (1.4)   (1.4)   $ (0.5)  
Investment in trust $ 0.3 0.3   0.3   0.3  
Debt Instrument, Interest Rate, Stated Percentage 2.67%            
Note to DPL Capital Trust II Maturing in September 2031 - 8.125% [Member]              
Related Party Transaction [Line Items]              
Note payable to trust $ 15.6 15.6   15.6   15.6  
Prepaid Expenses and Other Current Assets [Member]              
Related Party Transaction [Line Items]              
Accounts Receivable, Related Parties, Current      
Accrued Liabilities [Member]              
Related Party Transaction [Line Items]              
Net payable to the Service Company (50.5) (97.0)   (97.0)   (50.5)  
Charges for health, welfare and benefit plans [Member] | Subsidiary of Common Parent [Member]              
Related Party Transaction [Line Items]              
Transactions with other AES affiliates   3.9 4.3 5.6 12.5    
THE DAYTON POWER AND LIGHT COMPANY [Member]              
Related Party Transaction [Line Items]              
Charges for services provided   9.4 7.6 29.2 24.3    
Sales to related party   1.1 1.1 3.3 5.0    
Premiums paid for insurance services provided by MVIC   (0.8) (0.8) (2.5) (2.4)    
Expense recoveries for services provided to DPLER   0.0 0.6 0.0 1.8    
Net payable to the Service Company (0.5) (1.4)   (1.4)   (0.5)  
Gain on termination of contract   0.0 0.0 27.7 0.0    
Notes Payable, Related Parties       (5.0) 0.0 (35.0)  
Notes Payable, Related Parties 35.0 0.0   0.0   35.0  
Accounts Receivable, Related Parties, Current 2.8 4.3   4.3   2.8  
THE DAYTON POWER AND LIGHT COMPANY [Member] | Prepaid Expenses and Other Current Assets [Member]              
Related Party Transaction [Line Items]              
Accounts Receivable, Related Parties, Current 1.5     1.5  
THE DAYTON POWER AND LIGHT COMPANY [Member] | Accrued Liabilities [Member]              
Related Party Transaction [Line Items]              
Net payable to the Service Company (36.2)   (36.2)    
THE DAYTON POWER AND LIGHT COMPANY [Member] | Subsidiary of Common Parent [Member]              
Related Party Transaction [Line Items]              
Net payable to the Service Company             $ (7.5)
Equity Settlement of Related Party Payable       7.5 0.0    
THE DAYTON POWER AND LIGHT COMPANY [Member] | Insurance Proceeds Received [Member] | Subsidiary of Common Parent [Member]              
Related Party Transaction [Line Items]              
Transactions with other AES affiliates   0.2 0.5 0.4 4.3    
THE DAYTON POWER AND LIGHT COMPANY [Member] | Charges for health, welfare and benefit plans [Member] | Subsidiary of Common Parent [Member]              
Related Party Transaction [Line Items]              
Transactions with other AES affiliates   3.8 4.1 5.5 11.9    
THE DAYTON POWER AND LIGHT COMPANY [Member] | Dpler [Member]              
Related Party Transaction [Line Items]              
Sales to related party   $ 0.0 $ 66.0 $ 0.0 $ 245.0