Share-Based Compensation (Summarized Restricted Shares 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 Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year	219,391
Granted	67,346
Exercised	(286,737)
Outstanding at year end		219,391
Weighted-Average Grant Date Fair Value, Granted	1.8	1.1
DP&L [Member] | Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year	219,391	218,197
Granted	67,346	42,977
Exercised	(286,737)	(20,803)
Forfeited		(20,980)
Outstanding at year end		219,391
Weighted-Average Grant Date Fair Value, Granted	$ 1.8	$ 1.1