Ownership of Coal-fired Facilities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Construction work in process	$ 27,000,000
Number of Coal Fired Units	6
Impairment of Long-Lived Assets Held-for-use	11,500,000
Supplemental Eviromental Project	200,000
DP&L [Member]
Construction work in process	27,000,000
Number Of Generating Facilities	7
Number of Coal Fired Units	6
Supplemental Eviromental Project	200,000
Beckjord Unit 6 [Member]
Undivided ownership interests	50.00%
Property, Plant, and Equipment, Fair Value Disclosure	$ 0
Beckjord Unit 6 [Member] | DP&L [Member]
Undivided ownership interests	50.00%