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Contractual Obligations, Commercial Commitments and Contingencies (Narative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Public Utility, Property, Plant and Equipment [Line Items]    
Due to third parties, current $ 2.3 $ 0.5
Percentage of future committed coal 92.00%  
Number of Coal Suppliers 2  
THE DAYTON POWER AND LIGHT COMPANY [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Percentage of future committed coal 92.00%  
Number of Coal Suppliers 2  
DPLE [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Third party guarantees $ 16.6  
Debt Obligation on 4.9% Equity Ownership [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Equity ownership interest 4.90%  
Equity ownership interest aggregate cost $ 74.2  
Long Term Debt Date Range Equity Ownership, Start 2017  
Long Term Debt Date Range Equity Ownership, End 2040  
Electric Generation Company [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Debt obligation $ 1,514.3