Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Adjustments to reconcile Net income to Net cash provided by operating activities:
Amortization of intangibles	$ (35.2)	[1]	$ (30.5)	[1]
Cash and cash equivalents:
Balance at beginning of period	53.2
Cash and cash equivalents at end of period	17.0		53.2
THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from operating activities:
Net income	115.0		83.6		91.2
Adjustments to reconcile Net income to Net cash provided by operating activities:
Depreciation and amortization	144.8		140.2		141.3
Deferred income taxes	7.5		(16.8)		3.6
Fixed asset impairment			86.0		80.8
(Gain) Loss on Sale of Assets and Asset Impairment Charges	(3.5)		2.5		0.2
Recognition of Deferred SECA Revenue					17.8
Changes in certain assets and liabilities:
Accounts receivable	(7.1)		15.0		20.9
Inventories	(24.6)		27.2		14.2
Prepaid taxes	(1.1)		0.4		0.1
Increase (Decrease) in Property and Other Taxes Payable	6.9		1.8		(5.2)
Deferred regulatory costs, net	5.4		7.8		(1.5)
Accounts payable	32.4		(5.9)		(15.3)
Accrued taxes payable	9.0		(9.1)		(8.5)
Accrued interest payable	0.1		(3.4)		5.2
Pension, retiree and other benefits	19.1		1.8		28.5
Unamortized investment tax credit	(2.5)		(2.5)		(2.5)
Increase (Decrease) in Deferred Liabilities	(18.1)		5.9		(22.1)
Other	(17.8)		4.4		16.3
Net cash provided by operating activities	251.7		335.3		339.8
Cash flows from investing activities:
Capital expenditures	(114.2)		(122.1)		(195.5)
Proceeds from Sale of other property assets	10.7		0.8		0.2
Insurance proceeds	0.9		14.2
Increase (Decrease) in Restricted Cash	(3.7)		(2.3)		2.9
Other	1.3		(1.2)		0.3
Net cash used for investing activities	(108.5)		(114.5)		(197.5)
Cash flows from financing activities:
Dividends paid on common stock	(159.0)		(190.0)		(145.0)
Dividends paid on preferred stock	(0.9)		(0.9)		(0.9)
Deferred Finance Costs	(0.7)		(10.4)
Payment of long-term debt	(0.1)		(470.1)		(0.1)
Issuance of long-term debt			445.0
Net cash used for financing activities	(160.7)		(226.4)		(146.0)
Cash and cash equivalents:
Net change	(17.5)		(5.6)		(3.7)
Balance at beginning of period	22.9		28.5		32.2
Cash and cash equivalents at end of period	5.4		22.9		28.5
Supplemental cash flow information:
Interest paid, net of amounts capitalized	26.6		41.5		35.1
Income taxes paid/(refund), net	0.7		(20.3)		61.9
Non-cash financing and investing activities:
Accruals for capital expenditures	16.3		14.7		16.7
Successor [Member]
Cash flows from operating activities:
Net income	(74.6)		(222.0)		(1,729.8)
Adjustments to reconcile Net income to Net cash provided by operating activities:
Depreciation and amortization	139.8		132.9		125.4
Amortization of intangibles	1.2		7.1		95.1
Amortization of debt market value adjustments	0.3		(14.4)		(19.0)
Deferred income taxes	17.7		24.0		(4.2)
Fixed asset impairment	11.5		26.2
(Gain) Loss on Sale of Assets and Asset Impairment Charges	(3.9)		2.5		0.2
Charge for early redemption of debt	30.9		2.8
Goodwill Impairment	135.8		306.3		1,817.2
Recognition of Deferred SECA Revenue					17.8
Changes in certain assets and liabilities:
Accounts receivable	0.5		7.4		13.4
Inventories	(24.9)		27.4		15.6
Prepaid taxes	(0.9)		0.7
Increase (Decrease) in Property and Other Taxes Payable	7.1		1.4		(7.2)
Deferred regulatory costs, net	5.4		7.6		(1.1)
Accounts payable	32.1		(5.8)		(16.2)
Accrued taxes payable	20.7		(5.5)		5.1
Accrued interest payable	(1.3)		(3.3)		1.5
Pension, retiree and other benefits	19.1		1.8		28.5
Unamortized investment tax credit	(0.5)		(0.5)		(0.3)
Insurance and claims costs	(0.2)		(4.8)		(2.8)
Increase (Decrease) in Deferred Liabilities	(40.6)		1.5		(18.6)
Other	(16.9)		12.3		(7.9)
Net cash provided by operating activities	244.1		302.8		291.5
Cash flows from investing activities:
Capital expenditures	(118.1)		(124.4)		(198.1)
Proceeds from Sale of other property assets	10.7		0.8		1.1
Insurance proceeds	0.3		7.6
Increase (Decrease) in Restricted Cash	(3.3)		(2.8)		2.9
Other	1.3		(1.2)		0.3
Net cash used for investing activities	(112.6)		(123.9)		(199.2)
Cash flows from financing activities:
Dividends paid on common stock					(64.1)
Payment to former warrant holders					(9.0)
Deferred Finance Costs	(3.6)		(15.3)		(0.8)
Premium paid for early redemption of debt	(29.1)		(2.4)
Payment of long-term debt	(335.0)		(945.1)		(0.1)
Issuance of long-term debt	200.0		645.0
Withdrawals from revolving credit facilities	190.0		50.0
Repayments of borrowings from revolving credit facilities	(190.0)		(50.0)
Contributions to additional paid-in capital from parent					0.3
Net cash used for financing activities	(167.7)		(317.8)		(73.7)
Cash and cash equivalents:
Net change	(36.2)		(138.9)		18.6
Balance at beginning of period	53.2		192.1
Cash and cash equivalents at end of period	17.0		53.2		192.1
Supplemental cash flow information:
Interest paid, net of amounts capitalized	117.3		137.5		136.9
Income taxes paid/(refund), net	0.7		(5.2)		47.6
Non-cash financing and investing activities:
Accruals for capital expenditures	16.3		14.7		16.7
Customer Contracts [Member]
Adjustments to reconcile Net income to Net cash provided by operating activities:
Amortization of intangibles	(27.0)		(25.8)
Customer Relationships [Member]
Adjustments to reconcile Net income to Net cash provided by operating activities:
Amortization of intangibles	(6.9)	[2]	(4.6)	[2]
Other Intangible Assets [Member]
Adjustments to reconcile Net income to Net cash provided by operating activities:
Amortization of intangibles	(1.3)	[3]	(0.1)	[3]
Affiliated Entity [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from financing activities:
Proceeds from Short-term Debt	15.0
Repayments of Short-term Debt	(15.0)
Renewable Energy Certificates [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from investing activities:
Payments to Acquire Intangible Assets	(3.5)		(3.9)		(5.4)
Renewable Energy Certificates [Member] | Successor [Member]
Cash flows from investing activities:
Payments to Acquire Intangible Assets	$ (3.5)		$ (3.9)		$ (5.4)

[1] (c)Consists of various intangible assets including renewable energy credits, emission allowances, and other intangibles, none of which are individually significant.

[2] Represents above market contracts that DPLER has with third-party customers existing as of the Merger date.

[3] (b)Represents relationships DPLER has with third-party customers as of the Merger date, where DPLER has regular contact with the customer, and the customer has the ability to make direct contact with DPLER.