Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended		11 Months Ended	12 Months Ended
	Dec. 31, 2013 THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2012 THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2011 THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2011 Successor [Member]	Dec. 31, 2013 Successor [Member]	Dec. 31, 2012 Successor [Member]	Nov. 27, 2011 Predecessor [Member]	Dec. 31, 2013 Renewable Energy Certificates [Member] THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2012 Renewable Energy Certificates [Member] THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2011 Renewable Energy Certificates [Member] THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2013 Renewable Energy Certificates [Member] Successor [Member]	Dec. 31, 2012 Renewable Energy Certificates [Member] Successor [Member]
Cash flows from operating activities:
Net income	$ 83.6	$ 91.2	$ 193.2	$ (6.2)	$ (222.0)	$ (1,729.8)	$ 150.5
Adjustments to reconcile Net income to Net cash provided by operating activities:
Depreciation and amortization	140.2	141.3	134.9	11.6	132.9	125.4	129.4
Amortization of intangibles				11.6	7.1	95.1
Amortization of debt market value adjustments					(14.4)	(19.0)
Deferred income taxes	(16.8)	3.6	50.7	0.1	24.0	(4.2)	65.5
Gain on liquidation of DPL stock, held in trust			(14.6)	(26.9)
Fixed asset impairment	86.0	80.8			26.2
Charge for early redemption of debt					2.8		15.3
Goodwill Impairment					306.3	1,817.2
Recognition of deferred SECA revenue		(17.8)				(17.8)
Changes in certain assets and liabilities:
Accounts receivable	15.0	20.9	5.3	(12.3)	7.4	13.4	14.6
Inventories	27.2	14.2	(11.8)	(2.3)	27.4	15.6	(8.0)
Prepaid taxes	0.4	0.1	8.1	0.6	0.7		7.1
Taxes applicable to subsequent years	(1.8)	5.2	(9.0)	(71.2)	(1.4)	7.2	58.4
Deferred regulatory costs, net	7.8	(1.5)	(12.6)	0.1	7.6	(1.1)	(14.4)
Accounts payable	(5.9)	(15.3)	7.1	6.6	(5.8)	(16.2)	(0.6)
Accrued taxes payable	(9.1)	(8.5)	15.2	78.5	(5.5)	5.1	(58.6)
Accrued interest payable	(3.4)	5.2	0.2	6.4	(3.3)	1.5	(8.1)
Pension, retiree and other benefits	1.8	28.5	(24.0)	10.2	1.8	28.5	(34.2)
Unamortized investment tax credit	(2.5)	(2.5)	(2.5)	(0.2)	(0.5)	(0.3)	(2.3)
Insurance and claims costs				(0.1)	(4.8)	(2.8)	4.3
Other	12.8	(5.6)	24.0	(7.9)	16.3	(26.3)	15.5
Net cash provided by operating activities	335.3	339.8	364.2	(1.4)	302.8	291.5	334.4
Cash flows from investing activities:
Capital expenditures	(122.1)	(195.5)	(204.5)	(30.5)	(124.4)	(198.1)	(174.2)
Proceeds from sale of property - other	0.8	0.2			0.8	1.1
Insurance proceeds	14.2				7.6
Purchase of MC Squared							(8.3)
Payments to Acquire Intangible Assets								(3.9)	(5.4)	(4.4)	(3.9)	(5.4)
Increase (Decrease) in Restricted Cash	(2.3)	2.9	(3.8)	1.0	(2.8)	2.9	(4.8)
Purchases of short-term investments and securities							(1.7)
Sales of short-term investments and securities							70.9
Proceeds from liquidation of DPL stock, held in trust			26.9
Other	(1.2)	0.3	0.8	(0.3)	(1.2)	0.3	1.2
Net cash used for investing activities	(114.5)	(197.5)	(185.0)	(30.4)	(123.9)	(199.2)	(120.7)
Cash flows from financing activities:
Dividends paid on common stock	(190.0)	(145.0)	(220.0)	(63.0)		(64.1)	(113.0)
Dividends paid on preferred stock	(0.9)	(0.9)	(0.9)
Deferred Finance Costs	(10.4)				(15.3)	(0.8)
Proceeds from liquidation of DPL stock, held in trust				26.9
Premium paid for early redemption of debt					(2.4)		(12.2)
Payment of MC Squared debt							(13.5)
Payment of long-term debt	(470.1)	(0.1)	(0.1)		(945.1)	(0.1)	(419.5)
Issuance of long-term debt	445.0			125.0	645.0		300.0
Withdrawals from revolving credit facilities			50.0		50.0		50.0
Repayments of borrowings from revolving credit facilities			(50.0)		(50.0)		(50.0)
Contributions to additional paid-in capital from parent			20.0			0.3
Repurchase of warrants						(9.0)
Exercise of stock options							1.6
Exercise of warrants							14.7
Tax impact related to exercise of stock options							1.4
Net cash used for financing activities	(226.4)	(146.0)	(201.0)	88.9	(317.8)	(73.7)	(240.5)
Cash and cash equivalents:
Net change	(5.6)	(3.7)	(21.8)	57.1	(138.9)	18.6	(26.8)
Assumption of cash aquisition				19.2
Balance at beginning of period	28.5	32.2	54.0	97.2	192.1	173.5	124.0
Cash and cash equivalents at end of period	22.9	28.5	32.2	173.5	53.2	192.1	97.2
Supplemental cash flow information:
Interest paid, net of amounts capitalized	41.5	35.1	39.2	6.0	137.5	136.9	62.0
Income taxes refunded, net	(20.3)
Income taxes paid/(refund), net		61.9	13.9		(5.2)	47.6	25.6
Assumption of debit with acquisition				1,250.0
Non-cash financing and investing activities:
Accruals for capital expenditures	14.7	16.7	26.5	26.5	14.7	16.7	18.9
Long-term liability incurred for purchase of assets			$ 18.7				$ 18.7