Income Taxes (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Estimated annual effective income tax rate			(49.00%)	30.70%
Effective income tax rates	(4.80%)	13.30%	(49.00%)	18.20%
DP&L [Member]
Estimated annual effective income tax rate			30.40%	29.60%
Effective income tax rates	30.20%	17.40%	29.90%	20.90%