Goodwill And Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Goodwill

The following table summarizes the changes in Goodwill by reporting unit for the years ended December 31, 2015 and 2014:

$ in millions	DP&L Reporting Unit
Balance at December 31, 2014
Goodwill	$	2,440.5
Accumulated impairment losses	(2,123.5		)
Net balance at December 31, 2014	$	317.0
Goodwill impairments during 2015	$	(317.0	)
Balance at December 31, 2015
Goodwill	$	2,440.5
Accumulated impairment losses	(2,440.5		)
Net balance at December 31, 2015	$	—