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Contractual Obligations, Commercial Commitments and Contingencies (Narrative) (Details)
$ in Millions
Jun. 30, 2020
USD ($)
AES Ohio Generation [Member]  
Public Utility, Property, Plant and Equipment [Line Items]  
Third party guarantees $ 11.9
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 $ 64.0
Electric Generation Company [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]  
Public Utility, Property, Plant and Equipment [Line Items]  
Debt obligation $ 1,306.0