Fixed Asset Impairment Fixed Asset Impairment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Line Items]

Schedule of Fixed Asset Impairments

	Years ended December 31,
	2015		2014		2013
East Bend (DP&L)	$	—	$	11.5	$	—
Conesville (DP&L)	—		—		26.2
Total fixed-asset impairment expense	$	—	$	11.5	$	26.2

THE DAYTON POWER AND LIGHT COMPANY [Member]

Property, Plant and Equipment [Line Items]

Schedule of Fixed Asset Impairments

	Years ended December 31,
	2015		2014		2013
East Bend	$	—	$	—	$	76.0
Conesville	—		—		10.0
Total fixed-asset impairment expense	$	—	$	—	$	86.0