Share-Based Compensation (Summarized Restricted Stock Units Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	11 Months Ended	12 Months Ended
	Nov. 27, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year	219,391	218,197
Granted		42,977
Exercised		(20,803)
Forfeited		(20,980)
Outstanding at year end		219,391
Weighted-Average Grant Date Fair Value, Granted	$ 0.5	$ 0.5
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year		3,311
Exercised		(3,311)
DP&L [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised		(3,311)
Outstanding at year end		3,311