Share-Based Compensation (Information About Restricted Shares Activity) (Details) (USD $)	11 Months Ended	12 Months Ended
	Nov. 27, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of share based compensation award granted during the period	$ 500,000
Intrinsic value of share based compensation award exercised during the period	1,000,000
Fair value of shares that vested during the period	1,000,000
Weighted average period to recognize compensation expense (in years)	0 years
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of share based compensation award granted during the period	1,800,000
Intrinsic value of share based compensation award exercised during the period	8,600,000
Excess tax benefit from proceeds of share-based compensation award exercised	500,000
Fair value of shares that vested during the period	7,500,000
Weighted average period to recognize compensation expense (in years)	0 years
DP&L [Member] | Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of share based compensation award granted during the period		1,800,000
Intrinsic value of share based compensation award exercised during the period	8,600,000
Excess tax benefit from proceeds of share-based compensation award exercised	500,000
Fair value of shares that vested during the period	$ 7,500,000
Weighted average period to recognize compensation expense (in years)	0 months