Contractual Obligations, Commercial Commitments and Contingenciesl (Schedule Of Contractual Obligations And Commercial Commitments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Contractual Obligations, Commercial Commitments And Contingencies [Line Items]
Total long-term debt	$ 2,298.4
Long-term debt, Less than 1 year	10.2
Long-term debt, 2 - 3 years	955.2
Long-term debt, 4 - 5 years	100.2
Long-term debt, More than 5 years	1,232.8
Total Interest payments	944.0
Interest payments, Less than 1 year	114.9
Interest payments, 2 - 3 years	229.5
Interest payments, 4 - 5 years	151.5
Interest payments, More than 5 years	448.1
Total Pension and postretirement payments	264.2
Pension and postretirement payments, Less than 1 year	27.2
Pension and postretirement payments, 2 - 3 years	51.9
Pension and postretirement payments, 4 - 5 years	52.3
Pension and postretirement payments, More than 5 years	132.8
Total Operating leases	0.6
Operating leases, Less than 1 year	0.4
Operating leases, 2 - 3 years	0.2
Total Coal Contracts	625.6
Coal Contracts, Less than 1 year	216.5
Coal Contracts, 2 - 3 years	270.3
Coal Contracts, 4 - 5 years	138.8
Total Limestone Contracts	24.4
Limestone Contracts, Less than 1 year	6.1
Limestone Contracts, 2 - 3 years	12.2
Limestion Contracts, 4 - 5 years	6.1
Total Purchase orders and other contractual obligations	85.6
Purchase orders and other contractual obligations, Less than 1 year	48.8
Purchase orders and other contractual obligations, 2 - 3 years	18.7
Purchase orders and other contractual obligations, 4 - 5 years	18.1
Total contractual obligations	4,242.8
Total contractual obligations, Less than 1 year	424.1
Total contractual obligations, 2 - 3 years	1,538.0
Total contractual obligations, 4 - 5 years	467.0
Total contractual obligations, More than 5 years	1,813.7
DP&L [Member]
Contractual Obligations, Commercial Commitments And Contingencies [Line Items]
Total long-term debt	877.8
Long-term debt, Less than 1 year	0.2
Long-term debt, 2 - 3 years	445.2
Long-term debt, 4 - 5 years	0.2
Long-term debt, More than 5 years	432.2
Total Interest payments	361.0
Interest payments, Less than 1 year	24.1
Interest payments, 2 - 3 years	48.4
Interest payments, 4 - 5 years	31.7
Interest payments, More than 5 years	256.8
Total Pension and postretirement payments	264.5
Pension and postretirement payments, Less than 1 year	27.2
Pension and postretirement payments, 2 - 3 years	51.9
Pension and postretirement payments, 4 - 5 years	52.3
Pension and postretirement payments, More than 5 years	133.1
Total Operating leases	0.6
Operating leases, Less than 1 year	0.4
Operating leases, 2 - 3 years	0.2
Total Coal Contracts	625.6
Coal Contracts, Less than 1 year	216.5
Coal Contracts, 2 - 3 years	270.3
Coal Contracts, 4 - 5 years	138.8
Total Limestone Contracts	24.4
Limestone Contracts, Less than 1 year	6.1
Limestone Contracts, 2 - 3 years	12.2
Limestion Contracts, 4 - 5 years	6.1
Total Purchase orders and other contractual obligations	85.6
Purchase orders and other contractual obligations, Less than 1 year	48.8
Purchase orders and other contractual obligations, 2 - 3 years	18.7
Purchase orders and other contractual obligations, 4 - 5 years	18.1
Total contractual obligations	2,239.5
Total contractual obligations, Less than 1 year	323.3
Total contractual obligations, 2 - 3 years	846.9
Total contractual obligations, 4 - 5 years	247.2
Total contractual obligations, More than 5 years	$ 822.1