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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2016
Related Party Transaction [Line Items]        
Deferred Compensation Arrangement with Individual, Compensation Expense $ 0.4 $ 0.5 $ 0.5  
Sales to related party 4.2 4.6 6.2  
Charges for Services Provided 46.5 42.8 36.0  
Net payable to the Service Company (3.9) (2.0)    
Notes Receivable, Related Parties 0.0 5.0    
Investment in trust 0.3 0.3    
Due to Affiliate (0.6) 2.5    
THE DAYTON POWER AND LIGHT COMPANY [Member]        
Related Party Transaction [Line Items]        
Deferred Compensation Arrangement with Individual, Compensation Expense 0.4 0.5 0.5  
Sales to related party 4.2 4.5 6.1  
Charges for Services Provided 39.0 38.7 30.9  
Net payable to the Service Company (3.9) (2.0)    
Premiums paid for Insurance Services provided by MVIC 3.1 3.4 3.2  
Expense recoveries for services provided to DPLER 0.0 0.0 2.4  
Due to Affiliate (4.8) 2.5    
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    
Other Current Liabilities [Member]        
Related Party Transaction [Line Items]        
Accounts Payable, Related Parties 99.3    
Other Current Liabilities [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Related Party Transaction [Line Items]        
Accounts Payable, Related Parties    
DPLER [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Related Party Transaction [Line Items]        
Sales to related party 0.0 0.0 303.3  
AES Ohio Generation [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Related Party Transaction [Line Items]        
Charges for Services Provided 5.4 8.7 5.2  
Subsidiary of Common Parent [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Related Party Transaction [Line Items]        
Net payable to the Service Company       $ (7.5)
Charges for health, welfare and benefit plans [Member] | Subsidiary of Common Parent [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction 15.4 9.6 15.5  
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 14.3 9.4 14.8  
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 $ 3.7 $ 5.7 $ 4.9