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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Line Items]  
Summary of Property, Plant, and Equipment
The following is a summary of DPL’s Property, plant and equipment with corresponding composite depreciation rates at December 31, 2018 and 2017:
 
 
December 31, 2018
 
December 31, 2017
$ in millions
 
 
 
Composite Rate
 
 
 
Composite Rate (a)
Regulated:
 
 
 
 
 
 
 
 
Transmission
 
$
223.2

 
4.1%
 
$
242.7

 
4.0%
Distribution
 
1,289.8

 
4.5%
 
1,197.5

 
4.9%
General
 
13.2

 
8.5%
 
13.7

 
7.1%
Non-depreciable
 
60.4

 
N/A
 
64.7

 
N/A
Total regulated
 
1,586.6

 
 
 
1,518.6

 
 
Unregulated:
 
 
 
 
 
 
 
 
Production / Generation
 
—

 
N/A
 
0.2

 
N/A
Other
 
21.2

 
6.7%
 
21.1

 
7.0%
Non-depreciable
 
7.8

 
N/A
 
4.2

 
N/A
Total unregulated
 
29.0

 
 
 
25.5

 
 
 
 
 
 
 
 
 
 
 
Total property, plant and equipment in service
 
$
1,615.6

 
4.3%
 
$
1,544.1

 
5.0%


(a)
Composite rates for 2017 include property classified in non-current assets of discontinued operations and held-for-sale businesses.
Changes in the Liability for Generation AROs
Changes in the Liability for AROs
$ in millions
 
Balance at December 31, 2016
$
15.0

Calendar 2017
 
Revisions to cash flow and timing estimates
(0.1
)
Accretion expense
0.4

Settlements
(0.2
)
Balance at December 31, 2017
15.1

Calendar 2018
 
Revisions to cash flow and timing estimates
(2.6
)
Accretion expense
0.3

Settlements (a)
(3.4
)
Balance at December 31, 2018
$
9.4



(a)
Primarily includes settlement related to transfer of Beckjord Facility. See Note 16 – Dispositions for additional information.
Changes in the Liability for Transmission and Distribution Asset Removal Costs
Changes in the Liability for Transmission and Distribution Asset Removal Costs
$ in millions
 
Balance at December 31, 2016
$
126.5

Calendar 2017
 
Additions
12.0

Settlements
(5.7
)
Balance at December 31, 2017
132.8

Calendar 2018
 
Additions
14.3

Settlements
(8.0
)
Balance at December 31, 2018
$
139.1
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Property, Plant and Equipment [Line Items]  
Summary of Property, Plant, and Equipment
The following is a summary of DP&L’s Property, plant and equipment with corresponding composite depreciation rates at December 31, 2018 and 2017:
 
 
December 31, 2018
 
December 31, 2017
$ in millions
 
 
 
Composite Rate
 
 
 
Composite Rate (a)
Regulated:
 
 
 
 
 
 
 
 
Transmission
 
$
386.7

 
2.4%
 
$
414.6

 
2.4%
Distribution
 
1,796.4

 
3.2%
 
1,735.9

 
3.4%
General
 
30.9

 
3.6%
 
31.2

 
3.1%
Non-depreciable
 
60.4

 
N/A
 
64.6

 
N/A
Total regulated
 
2,274.4

 
 
 
2,246.3

 
 
Unregulated:
 
 
 
 
 
 
 
 
Other
 
—

 
N/A
 
0.2

 
2.7%
Non-depreciable
 
—

 
N/A
 
0.7

 
N/A
Total unregulated
 
—

 
 
 
0.9

 
 
 
 
 
 
 
 
 
 
 
Total property, plant and equipment in service
 
$
2,274.4

 
3.0%
 
$
2,247.2

 
3.4%
Changes in the Liability for Generation AROs
Changes in the Liability for Generation AROs
$ in millions
 
Balance at December 31, 2016
$
8.2

Calendar 2017
 
Accretion expense
0.1

Settlements
(0.3
)
Balance at December 31, 2017
8.0

Calendar 2018
 
Settlements (a)
(3.3
)
Balance at December 31, 2018
$
4.7



(a)
Primarily includes settlement related to transfer of Beckjord Facility. See Note 15 – Dispositions for additional information.
Changes in the Liability for Transmission and Distribution Asset Removal Costs
Changes in the Liability for Transmission and Distribution Asset Removal Costs
$ in millions
 
Balance at December 31, 2016
$
126.5

Calendar 2017
 
Additions
12.0

Settlements
(5.7
)
Balance at December 31, 2017
132.8

Calendar 2018
 
Additions
14.3

Settlements
(8.0
)
Balance at December 31, 2018
$
139.1