Goodwill And Other Intangible Assets (Change In Goodwill) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended					12 Months Ended
	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 DPL [Member]	Dec. 31, 2012 DPL [Member]	Dec. 31, 2011 DPL [Member]	Dec. 31, 2013 DP&L [Member]	Dec. 31, 2012 DP&L [Member]	Dec. 31, 2011 DP&L [Member]	Dec. 31, 2013 DPLER [Member]	Dec. 31, 2012 DPLER [Member]	Dec. 31, 2011 DPLER [Member]
Goodwill, Beginning Balance	$ 2,576.3	$ 759.1	$ 2,576.3	$ 759.1	$ 2,576.3		$ 623.3	$ 2,440.5		$ 135.8	$ 135.8	$ 135.8
Goodwill, Gross				2,576.3	2,576.3	2,576.3	2,440.5	2,440.5	2,440.5	135.8	135.8	135.8
Goodwill, Impairment Loss	1,850.0	306.3	1,817.2	(306.3)	(1,817.2)		(306.3)	(1,817.2)
Goodwill, Impaired, Accumulated Impairment Loss				(2,123.5)	(1,817.2)		(2,123.5)	(1,817.2)
Goodwill, Ending Balance		$ 452.8	$ 759.1	$ 452.8	$ 759.1		$ 317.0	$ 623.3		$ 135.8	$ 135.8	$ 135.8