Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020 and 2019:

	December 31, 2020			December 31, 2019
$ in millions			Composite Rate			Composite Rate
Regulated:
Transmission	$	273.0	3.2%	$	235.8	3.9%
Distribution	1,453.7		4.0%	1,364.2		4.1%
General	17.7		7.6%	16.5		9.0%
Non-depreciable	65.1		N/A	61.6		N/A
Total regulated	1,809.5			1,678.1
Unregulated:
Other	24.8		4.5%	19.0		7.6%
Non-depreciable	5.0		N/A	4.8		N/A
Total unregulated	29.8			23.8
Total property, plant and equipment in service	$	1,839.3	3.8%	$	1,701.9	4.0%

Changes in the Liability for Generation AROs

Changes in the Liability for AROs

	2020		2019
Balance as of January 1	$	4.7	$	4.7
Settlements (a)	(4.7)		—
Balance as of December 31	$	—	$	4.7

(a)    Settlements related to sale of DP&L's Hutchings Coal Station. See Note 16 – Dispositions for more information on the sale of the Hutchings Coal Station.

Changes in the Liability for Transmission and Distribution Asset Removal Costs

Changes in the Regulatory Liability for Transmission and Distribution Asset Removal Costs

	2020		2019
Balance as of January 1	$	143.6	$	139.1
Additions	15.6		14.8
Settlements	(20.4)		(10.3)
Balance as of December 31	$	138.8	$	143.6

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, 2020 and 2019:

	December 31, 2020			December 31, 2019
$ in millions			Composite Rate			Composite Rate
Regulated:
Transmission	$	425.5	2.1%	$	391.7	2.3%
Distribution	1,917.0		3.1%	1,851.2		3.0%
General	29.7		3.6%	30.0		4.9%
Non-depreciable	65.1		N/A	60.7		N/A
Total property, plant and equipment in service	$	2,437.3	2.8%	$	2,333.6	2.9%

Changes in the Liability for Generation AROs

Changes in the Liability for Generation AROs

	2020		2019
Balance at beginning of year	$	4.7	$	4.7
Settlements (a)	(4.7)		—
Balance at end of year	$	—	$	4.7

(a)    Primarily includes settlement related to transfer of the Hutchings Coal Station. See Note 14 – Dispositions for additional information.

Changes in the Liability for Transmission and Distribution Asset Removal Costs

	2020		2019
Balance at beginning of year	$	143.6	$	139.1
Additions	15.6		14.8
Settlements	(20.4)		(10.3)
Balance at end of year	$	138.8	$	143.6