Income Taxes (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Estimated annual effective income tax rate			(42.30%)	31.00%
Effective income tax rates	(71.50%)	25.40%	(34.20%)	21.50%
DP&L [Member]
Estimated annual effective income tax rate			30.50%	29.50%
Effective income tax rates	19.80%	24.40%	23.20%	22.50%