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Derivative Instruments and Hedging Activities (Narrative) (Details)
$ in Millions
Sep. 30, 2016
USD ($)
Additional Collateral, Aggregate Fair Value, OTC Commodity Derivatives $ 0.9
Fair value of commodity derivative instruments 30.9
Collateral Already Posted, Aggregate Fair Value 5.1
Liability position offset by the asset position of counterparties with master netting agreements 22.7
Collateral if debt were to fall below investment grade 3.1
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Additional Collateral, Aggregate Fair Value, OTC Commodity Derivatives 0.9
Fair value of commodity derivative instruments 31.0
Collateral Already Posted, Aggregate Fair Value 22.8
Liability position offset by the asset position of counterparties with master netting agreements 5.1
Collateral if debt were to fall below investment grade $ 3.1