Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ (249.0)	$ 19.9
Adjustments to reconcile Net income to Net cash provided by operating activities:
Depreciation and amortization	35.3	31.8
Amortization of intangibles	0.3	1.8
Amortization of debt market value adjustments		(4.8)
Deferred income taxes	(3.2)	23.3
Fixed asset impairment	11.5
Goodwill Impairment	135.8
Changes in certain assets and liabilities:
Accounts receivable	(13.7)	19.5
Inventories	(8.0)	(4.4)
Prepaid taxes	1.4
Taxes applicable to subsequent years	14.0	17.2
Deferred regulatory costs, net	(5.7)	3.6
Accounts payable	36.9	2.7
Accrued taxes payable	75.6	(33.7)
Accrued interest payable	14.5	23.7
Pension, retiree and other benefits	0.8	3.2
Unamortized investment tax credit	(0.1)
Insurance and claims costs		1.0
Other	(33.5)	1.4
Net cash provided by operating activities	12.9	106.2
Cash flows from investing activities:
Capital expenditures	(28.4)	(33.8)
Increase (Decrease) in Restricted Cash	(15.6)	(12.7)
Net cash used for investing activities	(45.3)	(47.0)
Cash flows from financing activities:
Withdrawals from revolving credit facilities	65.0
Repayments of borrowings from revolving credit facilities	(65.0)
Cash and cash equivalents:
Net change	(32.4)	59.2
Balance at beginning of period	53.2	192.1
Cash and cash equivalents at end of period	20.8	251.3
Supplemental cash flow information:
Interest paid, net of amounts capitalized	15.0	11.3
Income taxes paid/(refund), net	(0.3)	(20.0)
Non-cash financing and investing activities:
Accruals for capital expenditures	9.4	10.6
THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from operating activities:
Net income	9.4	30.2
Adjustments to reconcile Net income to Net cash provided by operating activities:
Depreciation and amortization	36.5	33.6
Deferred income taxes	1.4	22.9
Changes in certain assets and liabilities:
Accounts receivable	(14.8)	13.2
Inventories	(10.3)	(4.3)
Prepaid taxes	0.3
Taxes applicable to subsequent years	13.5	16.7
Deferred regulatory costs, net	(5.7)	3.6
Accounts payable	34.0	2.7
Accrued taxes payable	(21.5)	(25.3)
Accrued interest payable	(5.8)	2.3
Pension, retiree and other benefits	0.8	3.2
Unamortized investment tax credit	(0.6)	(0.6)
Other	(27.0)	3.6
Net cash provided by operating activities	10.2	101.8
Cash flows from investing activities:
Capital expenditures	(27.4)	(33.6)
Increase (Decrease) in Restricted Cash	(16.0)	(12.7)
Net cash used for investing activities	(44.7)	(46.8)
Cash flows from financing activities:
Dividends paid on common stock		(55.0)
Dividends paid on preferred stock	(0.2)	(0.2)
Issuance of notes payable - related party	15.0
Net cash used for financing activities	14.8	(55.2)
Cash and cash equivalents:
Net change	(19.7)	(0.2)
Balance at beginning of period	22.9	22.9
Cash and cash equivalents at end of period	3.2	28.3
Supplemental cash flow information:
Interest paid, net of amounts capitalized	12.8	7.9
Income taxes paid/(refund), net	(0.3)	(20.0)
Non-cash financing and investing activities:
Accruals for capital expenditures	9.4	10.6
Emission Allowances [Member]
Cash flows from investing activities:
Payments to Acquire Intangible Assets	(0.1)
Emission Allowances [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from investing activities:
Payments to Acquire Intangible Assets	(0.1)
Renewable Energy Certificates [Member]
Cash flows from investing activities:
Payments to Acquire Intangible Assets	(1.2)	(0.5)
Renewable Energy Certificates [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from investing activities:
Payments to Acquire Intangible Assets	$ (1.2)	$ (0.5)