Income Taxes (Narrative) (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Estimated annual effective income tax rate	(65.80%)	30.20%
Effective income tax rates	(65.80%)	23.20%
DP&L [Member]
Estimated annual effective income tax rate	30.60%	28.80%
Effective income tax rates	29.90%	24.10%