Share-Based Compensation (Information About Management Performance Shares Activity) (Details) (USD $)	11 Months Ended
	Nov. 27, 2011
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
Management Performance 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	1,300,000
Intrinsic value of share based compensation award exercised during the period	3,300,000
Fair value of shares that vested during the period	2,700,000
Weighted average period to recognize compensation expense (in years)	0 years
DP&L [Member] | Management Performance 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	1,300,000
Intrinsic value of share based compensation award exercised during the period	3,300,000
Fair value of shares that vested during the period	$ 2,700,000
Weighted average period to recognize compensation expense (in years)	0 months