Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2017

Entity Information [Line Items]

Schedule of Net Periodic Benefit Cost / (Income)

The net periodic benefit cost of the pension benefit plans for the three and six months ended June 30, 2017 and 2016 was:

Net Periodic Benefit Cost	Pension
	Three months ended						Six months ended
	June 30,						June 30,
$ in millions	2017			2016			2017			2016
Service cost	$	1.4		$	1.4		$	2.8		$	2.8
Interest cost	3.5			3.7			7.1			7.4
Expected return on plan assets	(5.7		)	(5.7		)	(11.4		)	(11.4		)
Plan curtailment (a)	—			—			4.1			—
Amortization of unrecognized:
Prior service cost	0.2			0.5			0.6			1.0
Actuarial loss	1.4			1.1			2.7			2.1
Net periodic benefit cost	$	0.8		$	1.0		$	5.9		$	1.9

(a) As a result of the decision to retire certain of DP&L's coal-fired plants, we recognized a plan curtailment of $4.1 million in the first quarter of 2017. See Note 14 – Fixed-asset Impairments for more information.

Estimated Future Benefit Payments and Medicare Part D Reimbursements

Benefit payments, which reflect future service, are estimated to be paid as follows:

$ in millions
Estimated to be paid during	Pension
2017	$	12.5
2018	25.5
2019	26.0
2020	26.4
2021	26.7
2022 - 2026	139.6

THE DAYTON POWER AND LIGHT COMPANY [Member]

Entity Information [Line Items]

Schedule of Net Periodic Benefit Cost / (Income)

The net periodic benefit cost of the pension benefit plans for the three and six months ended June 30, 2017 and 2016 was:

Net Periodic Benefit Cost	Pension
	Three months ended						Six months ended
	June 30,						June 30,
$ in millions	2017			2016			2017			2016
Service cost	$	1.4		$	1.4		$	2.8		$	2.8
Interest cost	3.5			3.7			7.1			7.4
Expected return on plan assets	(5.7		)	(5.7		)	(11.4		)	(11.4		)
Plan curtailment (a)	—			—			5.6			—
Amortization of unrecognized:
Prior service cost	0.3			0.7			0.8			1.5
Actuarial loss	2.3			1.8			4.5			3.6
Net periodic benefit cost	$	1.8		$	1.9		$	9.4		$	3.9

(a) As a result of the decision to retire certain of DP&L's coal-fired plants, we recognized a plan curtailment of $5.6 million in the first quarter of 2017. See Note 14 – Fixed-asset Impairments for more information.

Estimated Future Benefit Payments and Medicare Part D Reimbursements

Benefit payments, which reflect future service, are estimated to be paid as follows:

$ in millions
Estimated to be paid during	Pension
2017	$	12.5
2018	25.5
2019	26.0
2020	26.4
2021	26.7
2022 - 2026	139.6