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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Line Items]  
Schedule of Jointly Owned Utility Plants [Table Text Block]
L
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Changes in the Liability for Generation AROs
$ in millions
 
Balance January 1, 2017
$
138.8

Revisions to cash flow and timing estimates
(4.4
)
Accretion expense
2.0

Settlements
—

Reclassified to Liabilities held for sale
(4.7
)
Balance June 30, 2017
$
131.7


See Note 5 – Fair Value for further discussion on changes to our AROs.
Subsidiaries [Member]  
Property, Plant and Equipment [Line Items]  
Schedule of Jointly Owned Utility Plants [Table Text Block]
DP&L’s undivided ownership interest in such facilities at June 30, 2017, is as follows:
 
 
DP&L Share
 
DP&L Carrying Value
 
 
Ownership
%
 
Summer Production Capacity
(MW)
 
Gross Plant
In Service
($ in millions)
 
Accumulated
Depreciation
($ in millions)
 
Construction
Work in
Process
($ in millions)
Jointly-owned production units
 
 
 
 
 
 
 
 
 
 
Conesville - Unit 4
 
16.5
 
129

 
$
0.6

 
$
0.6

 
$
0.7

Killen - Unit 2
 
67.0
 
402

 
8.4

 
2.5

 
—

Miami Fort - Units 7 and 8 (a)
 
36.0
 
368

 
31.2

 
3.1

 
5.1

Stuart - Units 2 through 4
 
35.0
 
606

 
0.9

 
0.9

 
—

Zimmer - Unit 1 (a)
 
28.1
 
371

 
19.9

 
14.4

 
5.3

Transmission (at varying percentages)
 
 
 
 
 
99.3

 
67.1

 
—

Total
 
 
 
1,876

 
$
160.3

 
$
88.6

 
$
11.1
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Changes in the Liability for Generation AROs
$ in millions
 
Balance January 1, 2017
$
135.2

Revisions to cash flow and timing estimates
(4.4
)
Accretion expense
2.8

Settlements
—

Reclassified to Liabilities held for sale
(3.7
)
Balance June 30, 2017
$
129.9