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Goodwill And Other Intangible Assets (Intangible Assets Acquired) (Details) (Renewable Energy Certificates [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Renewable Energy Certificates [Member]
  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets $ 7.7us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= dpl_RenewableEnergyCertificatesMember