Fixed Asset Impairment Fixed Asset Impairment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Line Items]

Schedule of Fixed Asset Impairments

During the years ended December 31, 2017, 2016 and 2015, DPL had the following fixed-asset impairments:

		Years ended December 31,
$ in millions	Measurement Date	2017		2016		2015
AES Ohio Generation peakers	December 31, 2017	$	109.4	$	—	$	—
Stuart	March 31, 2017	39.1		—		—
Killen	March 31, 2017	27.3		—		—
Killen	December 31, 2016	—		75.4		—
Stuart	December 31, 2016	—		228.5		—
Miami Fort	December 31, 2016	—		149.4		—
Zimmer	December 31, 2016	—		144.7		—
Conesville	December 31, 2016	—		23.9		—
Hutchings peaking facilities	December 31, 2016	—		1.6		—
Killen	June 30, 2016	—		230.8		—
Certain peaking facilities	June 30, 2016	—		4.7		—
Total impairment loss		$	175.8	$	859.0	$	—