Fair Value (Tables)

9 Months Ended

Sep. 30, 2022

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Inputs and Valuation Techniques

The following table presents the carrying amount, fair value, and fair value hierarchy of our financial liabilities that are not measured at fair value in the Condensed Consolidated Balance Sheets as of the periods indicated, but for which fair value is disclosed:

	Carrying Amount		Fair value as of September 30, 2022								Carrying Amount		Fair value as of December 31, 2021
$ in millions			Level 1		Level 2		Level 3		Total				Level 1		Level 2		Level 3		Total
Liabilities
Long-term debt	$	1,535.6	$	—	$	1,346.0	$	17.1	$	1,363.1	$	1,395.5	$	—	$	1,502.5	$	17.2	$	1,519.7

Fair Value and Cost Of Non-Derivative Instruments

The following table presents the fair value, carrying value and cost of our non-derivative instruments as of September 30, 2022 and December 31, 2021.

	September 30, 2022				December 31, 2021
$ in millions	Cost		Fair Value		Cost		Fair Value
Assets
Money market funds	$	0.4	$	0.4	$	0.4	$	0.4
Equity securities	1.8		3.6		1.9		5.1
Debt securities	3.7		3.2		3.8		3.9
Total	$	5.9	$	7.2	$	6.1	$	9.4

Fair Value of Assets and Liabilities Measured on Recurring Basis

The fair value of assets and liabilities as of September 30, 2022 and December 31, 2021 measured on a recurring basis and the respective category within the fair value hierarchy for DPL is as follows:

$ in millions	Fair value as of September 30, 2022								Fair value as of December 31, 2021
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets
Master Trust assets
Money market funds	$	0.4	$	—	$	—	$	0.4	$	0.4	$	—	$	—	$	0.4
Equity securities	—		3.6		—		3.6		—		5.1		—		5.1
Debt securities	—		3.2		—		3.2		—		3.9		—		3.9
Total assets	$	0.4	$	6.8	$	—	$	7.2	$	0.4	$	9.0	$	—	$	9.4

Subsidiaries [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Measurement Inputs and Valuation Techniques

The following table presents the carrying amount, fair value, and fair value hierarchy of our financial liabilities that are not measured at fair value in the Condensed Balance Sheets as of the periods indicated, but for which fair value is disclosed:

	Carrying Amount		Fair value as of September 30, 2022							Carrying Amount		Fair value as of December 31, 2021
$ in millions			Level 1		Level 2		Level 3	Total				Level 1		Level 2		Level 3		Total
Liabilities
Long-term debt	$	712.9	$	—	$	610.0	17.1	$	627.1	$	574.3	$	—	$	625.4	$	17.2	$	642.6

Fair Value and Cost Of Non-Derivative Instruments

The following table presents the fair value, carrying value and cost of our non-derivative instruments as of September 30, 2022 and December 31, 2021.

	September 30, 2022				December 31, 2021
$ in millions	Cost		Fair Value		Cost		Fair Value
Assets
Money market funds	$	0.4	$	0.4	$	0.4	$	0.4
Equity securities	1.8		3.6		1.9		5.1
Debt securities	3.7		3.2		3.8		3.9
Total	$	5.9	$	7.2	$	6.1	$	9.4

Fair Value of Assets and Liabilities Measured on Recurring Basis

The fair value of assets and liabilities as of September 30, 2022 and December 31, 2021 measured on a recurring basis and the respective category within the fair value hierarchy for AES Ohio is as follows:

$ in millions	Fair value as of September 30, 2022								Fair value as of December 31, 2021
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets
Master Trust assets
Money market funds	$	0.4	$	—	$	—	$	0.4	$	0.4	$	—	$	—	$	0.4
Equity securities	—		3.6		—		3.6		—		5.1		—		5.1
Debt securities	—		3.2		—		3.2		—		3.9		—		3.9
Total assets	$	0.4	$	6.8	$	—	$	7.2	$	0.4	$	9.0	$	—	$	9.4