Supplemental Financial Information (Tables)

6 Months Ended

Jun. 30, 2020

Supplemental Financial Information [Line Items]

Schedule of Supplemental Financial Information

Accounts receivable are as follows at June 30, 2020 and December 31, 2019:

	June 30,		December 31,
$ in millions	2020		2019
Accounts receivable, net:
Customer receivables	$	41.4	$	45.7
Unbilled revenue	19.9		19.4
Amounts due from affiliates	0.2		0.3
Due from PJM transmission enhancement settlement	1.8		1.8
Other	1.5		1.1
Allowance for credit losses	(3.0)		(0.4)
Total accounts receivable, net	$	61.8	$	67.9

Schedule of Inventory, Current [Table Text Block]

Inventories consist of materials and supplies at June 30, 2020 and December 31, 2019.

Reclassification out of Accumulated Other Comprehensive Income

The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three and six months ended June 30, 2020 and 2019 are as follows:

Details about Accumulated Other Comprehensive Income / (Loss) components	Affected line item in the Condensed Consolidated Statements of Operations	Three months ended				Six months ended
		June 30,				June 30,
$ in millions		2020		2019		2020		2019
Gains and losses on cash flow hedges (Note 5):
	Interest expense	$	(0.2)	$	(0.3)	$	(0.6)	$	(0.6)
	Income tax expense	—		—		0.1		0.1
	Net of income taxes	(0.2)		(0.3)		(0.5)		(0.5)
Amortization of defined benefit pension items (Note 8):
	Other expense	0.3		—		0.6		0.1
	Income tax benefit	(0.1)		—		(0.1)		—
	Net of income taxes	0.2		—		0.5		0.1
Total reclassifications for the period, net of income taxes		$	—	$	(0.3)	$	—	$	(0.4)

Schedule of Accumulated Other Comprehensive Income (Loss)

The changes in the components of Accumulated Other Comprehensive Loss during the six months ended June 30, 2020 are as follows:

$ in millions	Gains / (losses) on cash flow hedges		Change in unfunded pension and postretirement benefit obligations		Total
Balance at January 1, 2020	$	14.5	$	(18.1)	$	(3.6)
Other comprehensive loss before reclassifications	(0.1)		—		(0.1)
Amounts reclassified from AOCI to earnings	(0.5)		0.5		—
Net current period other comprehensive income / (loss)	(0.6)		0.5		(0.1)
Balance at June 30, 2020	$	13.9	$	(17.6)	$	(3.7)

THE DAYTON POWER AND LIGHT COMPANY [Member]

Supplemental Financial Information [Line Items]

Schedule of Supplemental Financial Information

Accounts receivable are as follows at June 30, 2020 and December 31, 2019:

	June 30,		December 31,
$ in millions	2020		2019
Accounts receivable, net:
Customer receivables	$	40.0	$	45.0
Unbilled revenue	19.9		19.4
Amounts due from affiliates	5.8		3.9
Due from PJM transmission enhancement settlement	1.8		1.8
Other	1.5		1.2
Allowance for credit losses	(3.0)		(0.4)
Total accounts receivable, net	$	66.0	$	70.9

Schedule of Inventory, Current [Table Text Block]

Inventories consist of materials and supplies at June 30, 2020 and December 31, 2019.

Reclassification out of Accumulated Other Comprehensive Income

The amounts reclassified out of Accumulated Other Comprehensive Loss by component during the three and six months ended June 30, 2020 and 2019 are as follows:

Details about Accumulated Other Comprehensive Income / (Loss) components	Affected line item in the Condensed Statements of Operations	Three months ended				Six months ended
		June 30,				June 30,
$ in millions		2020		2019		2020		2019
Gains and losses on cash flow hedges (Note 5):
	Interest expense	$	(0.1)	$	—	$	(0.2)	$	(0.1)
	Income tax expense	—		—		—		—
	Net of income taxes	(0.1)		—		(0.2)		(0.1)
Amortization of defined benefit pension items (Note 8):
	Other expense	1.0		0.9		2.0		1.8
	Income tax expense / (benefit)	(0.2)		(1.2)		(0.4)		(1.4)
	Net of income taxes	0.8		(0.3)		1.6		0.4
Total reclassifications for the period, net of income taxes		$	0.7	$	(0.3)	$	1.4	$	0.3

Schedule of Accumulated Other Comprehensive Income (Loss)

The changes in the components of Accumulated Other Comprehensive Loss during the six months ended June 30, 2020 are as follows:

$ in millions	Gains / (losses) on cash flow hedges		Change in unfunded pension and postretirement benefit obligations		Total
Balance at January 1, 2020	$	(0.4)	$	(36.5)	$	(36.9)
Other comprehensive loss before reclassifications	(0.1)		—		(0.1)
Amounts reclassified from AOCI to earnings	(0.2)		1.6		1.4
Net current period other comprehensive income / (loss)	(0.3)		1.6		1.3
Balance at June 30, 2020	$	(0.7)	$	(34.9)	$	(35.6)