Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2015

Entity Information [Line Items]

Schedule of Net Periodic Benefit Cost / (Income)

The net periodic benefit cost of the pension and postretirement benefit plans for the three and nine months ended September 30, 2015 and 2014 was:

Net Periodic Benefit Cost	Pension						Postretirement
	Three months ended						Three months ended
	September 30,						September 30,
$ in millions	2015			2014			2015			2014
Service cost	$	1.7		$	1.5		$	0.1		$	—
Interest cost	4.4			4.3			0.2			0.2
Expected return on plan assets	(5.7		)	(5.8		)	(0.1		)	—
Amortization of unrecognized:
Prior service cost	0.5			0.4			—			—
Actuarial loss / (gain)	1.5			0.9			(0.1		)	(0.1		)
Net periodic benefit cost	$	2.4		$	1.3		$	0.1		$	0.1

Net Periodic Benefit Cost	Pension						Postretirement
	Nine months ended						Nine months ended
	September 30,						September 30,
$ in millions	2015			2014			2015			2014
Service cost	$	5.3		$	4.5		$	0.1		$	0.1
Interest cost	13.0			13.1			0.5			0.6
Expected return on plan assets	(17.0		)	(17.2		)	(0.1		)	(0.1		)
Amortization of unrecognized:
Prior service cost	1.5			1.1			—			—
Actuarial loss / (gain)	4.4			2.6			(0.3		)	(0.4		)
Net periodic benefit cost	$	7.2		$	4.1		$	0.2		$	0.2

Estimated Future Benefit Payments and Medicare Part D Reimbursements

Benefit payments and Medicare Part D reimbursements, which reflect future service, are estimated to be paid as follows:

$ in millions	Pension		Postretirement
2015	$	6.2	$	0.5
2016	25.2		1.8
2017	25.7		1.7
2018	26.3		1.6
2019	26.7		1.5
2020 - 2024	137.0		6.1

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 and postretirement benefit plans for the three and nine months ended September 30, 2015 and 2014 was:

Net Periodic Benefit Cost	Pension						Postretirement
	Three months ended						Three months ended
	September 30,						September 30,
$ in millions	2015			2014			2015			2014
Service cost	$	1.8		$	1.5		$	0.1		$	—
Interest cost	4.2			4.3			0.1			0.2
Expected return on plan assets	(5.6		)	(5.7		)	(0.1		)	(0.1		)
Amortization of unrecognized:
Prior service cost	0.9			0.7			0.1			0.1
Actuarial loss / (gain)	2.4			1.6			(0.2		)	(0.2		)
Net periodic benefit cost	$	3.7		$	2.4		$	—		$	—

Net Periodic Benefit Cost	Pension						Postretirement
	Nine months ended						Nine months ended
	September 30,						September 30,
$ in millions	2015			2014			2015			2014
Service cost	$	5.3		$	4.4		$	0.1		$	0.1
Interest cost	12.8			13.0			0.5			0.6
Expected return on plan assets	(16.8		)	(17.0		)	(0.1		)	(0.2		)
Amortization of unrecognized:
Prior service cost	2.5			2.1			0.1			0.1
Actuarial loss / (gain)	7.2			4.8			(0.5		)	(0.5		)
Net periodic benefit cost	$	11.0		$	7.3		$	0.1		$	0.1

Estimated Future Benefit Payments and Medicare Part D Reimbursements

Benefit payments and Medicare Part D reimbursements, which reflect future service, are estimated to be paid as follows:

$ in millions	Pension		Postretirement
2015	$	6.2	$	0.5
2016	25.2		1.8
2017	25.7		1.7
2018	26.3		1.6
2019	26.7		1.5
2020 - 2024	137.0		6.1