Share-Based Compensation (Restricted Shares Matching Criteria) (Details)	11 Months Ended
	Nov. 27, 2011
Less than 25% [Member]
Percentage of additional Shares that will be matched based on percent of income invested	25.00%
Less than 25% [Member] | DP&L [Member]
Percentage of additional Shares that will be matched based on percent of income invested	25.00%
25% to Less than 50% [Member]
Percentage of additional Shares that will be matched based on percent of income invested	50.00%
25% to Less than 50% [Member] | DP&L [Member]
Percentage of additional Shares that will be matched based on percent of income invested	50.00%
50% to Less than 100% [Member]
Percentage of additional Shares that will be matched based on percent of income invested	75.00%
50% to Less than 100% [Member] | DP&L [Member]
Percentage of additional Shares that will be matched based on percent of income invested	75.00%
100% to 200% [Member]
Percentage of additional Shares that will be matched based on percent of income invested	125.00%
100% to 200% [Member] | DP&L [Member]
Percentage of additional Shares that will be matched based on percent of income invested	125.00%