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Goodwill And Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
The following table summarizes the changes in Goodwill by reportable segment for the years ended December 31, 2015, 2014 and 2013:
$ in millions
 
DP&L Reporting Unit
 
DPLER Reporting Unit
 
Total
Balance at December 31, 2013
 
 
 
 
 
 
Goodwill
 
$
2,440.5

 
$
135.8

 
$
2,576.3

Accumulated impairment losses
 
(2,123.5
)
 
—

 
(2,123.5
)
Net balance at December 31, 2013
 
$
317.0

 
$
135.8

 
$
452.8

 
 
 
 
 
 
 
Goodwill impairments during 2014
 
$
—

 
$
(135.8
)
 
$
(135.8
)
Balance at December 31, 2014
 
 
 
 
 
 
Goodwill
 
$
2,440.5

 
$
135.8

 
$
2,576.3

Accumulated impairment losses
 
(2,123.5
)
 
(135.8
)
 
(2,259.3
)
Net balance at December 31, 2014
 
$
317.0

 
$
—

 
$
317.0

 
 
 
 
 
 
 
Goodwill impairments during 2015
 
$
(317.0
)
 
$
—

 
$
(317.0
)
Balance at December 31, 2015
 
 
 
 
 
 
Goodwill
 
$
2,440.5

 
$
135.8

 
$
2,576.3

Accumulated impairment losses
 
(2,440.5
)
 
(135.8
)
 
(2,576.3
)
Net balance at December 31, 2015
 
$
—

 
$
—

 
$
—