Debt Obligations (Current portion - Long-term Debt) (Details) (USD $) In Millions, unless otherwise specified					12 Months Ended								12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 DP&L [Member]	Dec. 31, 2012 DP&L [Member]	Dec. 31, 2013 Pollution control series maturing in November 2040 - variable rates: 0.04% - 0.26% and 0.06% - 0.32% [Member]	Dec. 31, 2012 Pollution control series maturing in November 2040 - variable rates: 0.04% - 0.26% and 0.06% - 0.32% [Member]	Dec. 31, 2013 Pollution control series maturing in November 2040 - variable rates: 0.04% - 0.26% and 0.06% - 0.32% [Member] DP&L [Member]	Dec. 31, 2012 Pollution control series maturing in November 2040 - variable rates: 0.04% - 0.26% and 0.06% - 0.32% [Member] DP&L [Member]	Dec. 31, 2013 First Mortgage Bonds Maturing in October 2013 - 5.125% [Member]	Dec. 31, 2012 First Mortgage Bonds Maturing in October 2013 - 5.125% [Member]	Dec. 31, 2013 First Mortgage Bonds Maturing in October 2013 - 5.125% [Member] DP&L [Member]	Dec. 31, 2012 First Mortgage Bonds Maturing in October 2013 - 5.125% [Member] DP&L [Member]	Dec. 31, 2013 U.S. Government note maturing in February 2061 - 4.20% [Member]	Dec. 31, 2012 U.S. Government note maturing in February 2061 - 4.20% [Member]	Mar. 01, 2011 U.S. Government note maturing in February 2061 - 4.20% [Member]	Dec. 31, 2013 U.S. Government note maturing in February 2061 - 4.20% [Member] DP&L [Member]	Dec. 31, 2012 U.S. Government note maturing in February 2061 - 4.20% [Member] DP&L [Member]	Mar. 01, 2011 U.S. Government note maturing in February 2061 - 4.20% [Member] DP&L [Member]	Dec. 31, 2013 Bank Term Loan maturing in May 2018 [Member]
Obligation for capital lease	$ 0.1	$ 0.3	$ 0.1	$ 0.3
Current portion - long-term debt	10.2	584.9	0.2	570.4		100.0		100.0		484.5		470.0							10.0
Debt instrument maturity year					Nov. 01, 2040		Nov. 01, 2040		Oct. 01, 2013				Feb. 01, 2061			Feb. 01, 2061			May 01, 2018
Debt instrument interest percentage									5.125%		1.875%		4.20%		4.20%	4.20%		4.20%	2.42%
Debt instrument interest percentage minimum					0.05%	0.04%	0.05%	0.04%								4.20%			2.42%
Debt instrument interest percentage maximum					0.24%	0.26%	0.24%	0.26%											2.45%
U.S. Government note maturing in February 2061 - 4.20%, current													$ 0.1	$ 0.1		$ 0.1	$ 0.1