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Fixed Asset Impairment Fixed Asset Impairment (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Line Items]  
Schedule of Fixed Asset Impairments
During the years ended December 31, 2016, 2015 and 2014, DPL had the following fixed-asset impairments:
 
 
 
 
Years ended December 31,
 
 
Measurement Date
 
2016
 
2015
 
2014
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

 

 

East Bend
 
March 31, 2014
 

 

 
11.5

 
 
 
 
 
 
 
 
 
Total impairment loss
 
 
 
$
859.0

 
$

 
$
11.5

THE DAYTON POWER AND LIGHT COMPANY [Member]  
Property, Plant and Equipment [Line Items]  
Schedule of Fixed Asset Impairments
During the years ended December 31, 2016, 2015 and 2014, DP&L had the following fixed-asset impairments:
 
 
 
 
Years ended December 31,
 
 
Measurement Date
 
2016
 
2015
 
2014
Killen
 
December 31, 2016
 
$
75.3

 
$

 
$

Stuart
 
December 31, 2016
 
149.9

 

 

Miami Fort
 
December 31, 2016
 
157.7

 

 

Zimmer
 
December 31, 2016
 
91.3

 

 

Conesville
 
December 31, 2016
 
20.8

 

 

Hutchings peaking facilities
 
December 31, 2016
 
1.4

 

 

Stuart
 
June 30, 2016
 
292.0

 

 

Killen
 
June 30, 2016
 
246.2

 

 

Zimmer
 
June 30, 2016
 
318.9

 

 

 
 
 
 
 
 
 
 
 
Total impairment loss
 
 
 
$
1,353.5

 
$

 
$