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Ownership of Coal-fired Facilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Construction work in process	$ 19.0
Impairment of Long-Lived Assets Held-for-use	11.5
DP&L [Member]
Construction work in process	$ 19.0
Number Of Generating Facilities	7

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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