Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)		$ (239.0)	$ (74.6)	$ (222.0)
Adjustments to reconcile Net loss to Net cash from operating activities
Depreciation and amortization		138.8	139.8	132.9
Amortization of intangibles		0.0	1.2	7.1
Amortization of debt market value adjustments		(1.1)	0.3	(14.4)
Amortization of deferred financing costs		5.9	6.3	5.0
Unrealized loss (gain) on derivatives		5.8	3.0	5.9
Deferred income taxes		(17.1)	17.7	24.0
Charge for early redemption of debt		2.1	30.9	2.8
Goodwill impairment	[1]	317.0	135.8	306.3
Fixed-asset impairment		0.0	11.5	26.2
Loss / (Gain) on asset disposal		0.4	(3.9)	2.5
Changes in certain assets and liabilities:
Accounts receivable		43.4	0.5	7.4
Inventories		(9.0)	(24.9)	27.4
Prepaid taxes		(1.3)	(0.9)	0.7
Taxes applicable to subsequent years		(3.4)	(7.1)	(1.4)
Deferred regulatory costs, net		21.8	5.4	7.6
Accounts payable		(5.1)	32.1	(5.8)
Accrued taxes payable		43.8	20.7	(5.5)
Accrued interest payable		(5.7)	(1.3)	(3.3)
Other current and deferred liabilities		(10.4)	(40.6)	1.5
Pension, retiree and other benefits		(0.7)	19.1	1.8
Unamortized investment tax credit		(0.5)	(0.5)	(0.5)
Insurance and claims costs		(0.5)	(0.2)	(4.8)
Other		23.3	(26.2)	1.4
Net cash from operating activities		308.5	244.1	302.8
Cash flows from investing activities:
Capital expenditures		(137.2)	(118.1)	(124.4)
Proceeds from sale of property		1.3	10.7	0.8
Insurance proceeds		0.0	0.3	7.6
Purchase of renewable energy credits		(0.8)	(3.5)	(3.9)
Decrease / (increase) in restricted cash		(0.4)	(3.3)	(2.8)
Other investing activities, net		0.4	1.3	(1.2)
Net cash from investing activities		(136.7)	(112.6)	(123.9)
Cash flows from financing activities:
Deferred financing costs		(6.9)	(3.6)	(15.3)
Retirement of debt		(474.5)	(335.0)	(945.1)
Premium paid for early redemption of debt		0.0	(29.1)	(2.4)
Issuance of long-term debt		325.0	200.0	645.0
Borrowings from revolving credit facilities		80.0	190.0	50.0
Repayment of borrowings from revolving credit facilities		(80.0)	(190.0)	(50.0)
Net cash from financing activities		(156.4)	(167.7)	(317.8)
Cash and cash equivalents:
Net increase / (decrease) in cash		15.4	(36.2)	(138.9)
Balance at beginning of period		17.0	53.2	192.1
Cash and cash equivalents at end of period		32.4	17.0	53.2
Supplemental cash flow information:
Interest paid, net of amounts capitalized		111.6	117.3	137.5
Income taxes paid / (refunded), net		0.8	0.7	(5.2)
Non-cash financing and investing activities:
Accruals for capital expenditures		18.6	16.3	14.7
THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from operating activities:
Net income (loss)		106.4	115.0	83.6
Adjustments to reconcile Net loss to Net cash from operating activities
Depreciation and amortization		138.2	144.8	140.2
Amortization of deferred financing costs		2.9	3.1	1.5
Unrealized loss (gain) on derivatives		5.7	2.1	1.3
Deferred income taxes		(19.2)	7.5	(16.8)
Charge for early redemption of debt		5.0	0.0	0.0
Goodwill impairment		317.0	0.0	306.3
Fixed-asset impairment		0.0	0.0	86.0
Loss / (Gain) on asset disposal		0.4	(3.5)	2.5
Changes in certain assets and liabilities:
Accounts receivable		28.7	(7.1)	15.0
Inventories		(9.1)	(24.6)	27.2
Prepaid taxes		(1.3)	(1.1)	0.4
Taxes applicable to subsequent years		(3.7)	(6.9)	(1.8)
Deferred regulatory costs, net		21.8	5.4	7.8
Accounts payable		(5.8)	32.4	(5.9)
Accrued taxes payable		7.3	9.0	(9.1)
Accrued interest payable		(5.7)	0.1	(3.4)
Other current and deferred liabilities		(9.3)	(18.1)	5.9
Pension, retiree and other benefits		(0.7)	19.1	1.8
Unamortized investment tax credit		(2.4)	(2.5)	(2.5)
Other		2.5	(23.0)	1.6
Net cash from operating activities		256.7	251.7	335.3
Cash flows from investing activities:
Capital expenditures		(127.0)	(114.2)	(122.1)
Proceeds from sale of property		0.0	10.7	0.8
Insurance proceeds		5.2	0.9	14.2
Purchase of renewable energy credits		(0.8)	(3.5)	(3.9)
Decrease / (increase) in restricted cash		(0.3)	(3.7)	(2.3)
Other investing activities, net		0.4	1.3	(1.2)
Net cash from investing activities		(122.5)	(108.5)	(114.5)
Cash flows from financing activities:
Dividends paid on preferred stock		(0.9)	(0.9)	(0.9)
Deferred financing costs		(3.9)	(0.7)	(10.4)
Retirement of debt		(314.4)	(0.1)	(470.1)
Issuance of long-term debt		200.0	0.0	445.0
Borrowings from revolving credit facilities		50.0	0.0	0.0
Repayment of borrowings from revolving credit facilities		(50.0)	0.0	0.0
Dividends paid on common stock to parent		(50.0)	(159.0)	(190.0)
Borrowings from related party		35.0	15.0	0.0
Repayment of borrowings from related party		0.0	(15.0)	0.0
Net cash from financing activities		(134.2)	(160.7)	(226.4)
Cash and cash equivalents:
Net increase / (decrease) in cash		0.0	(17.5)	(5.6)
Balance at beginning of period		5.4	22.9	28.5
Cash and cash equivalents at end of period		5.4	5.4	22.9
Supplemental cash flow information:
Interest paid, net of amounts capitalized		27.5	26.6	41.5
Income taxes paid / (refunded), net		0.8	0.7	(20.3)
Non-cash financing and investing activities:
Accruals for capital expenditures		$ 16.9	$ 16.3	$ 14.7

[1] Goodwill impairment of $135.8 million in 2014 has been reclassified to Discontinued operations in the Consolidated Statement of Operations.