Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ (105.0)	$ 50.4
Adjustments to reconcile net income / (loss) to net cash from operating activities:
Depreciation and amortization	69.4	69.3
Amortization of debt market value adjustments	0.1	0.0
Charge for early retirement of debt	2.6	0.0
Deferred income taxes	(95.9)	(17.5)
Impairment of Long-Lived Assets Held-for-use	235.5	0.0
Gain on sale of business	(49.2)	0.0
Changes in certain assets and liabilities:
Accounts receivable	52.7	25.0
Inventories	21.6	(4.5)
Prepaid taxes	0.2	(0.5)
Taxes applicable to subsequent years	41.7	38.6
Deferred regulatory costs, net	8.0	21.3
Accounts payable	(11.7)	3.3
Accrued taxes payable	(25.7)	(15.5)
Accrued interest payable	(0.8)	0.0
Unamortized Investment tax credit	(0.2)	0.0
Insurance and claims costs	(0.4)	0.0
Pension, retiree and other benefits	(4.2)	3.8
Other	(6.3)	(2.2)
Net cash provided by operating activities	132.4	171.5
Cash flows from investing activities:
Capital expenditures	(79.1)	(64.8)
Proceeds from sale of business	75.5	1.3
Insurance proceeds	3.2	0.0
Purchase of intangible assets	(0.2)	(0.2)
Increase in restricted cash	(16.0)	(8.4)
Other investing activities, net	0.7	0.4
Net cash used in investing activities	(15.9)	(71.7)
Cash flows from financing activities:
Payments of Deferred Finance Costs	0.0	(0.1)
Retirement of long-term debt	(75.4)	(0.1)
Borrowings from revolving credit facilities	0.0	15.0
Repayment of borrowings from revolving credit facilities	0.0	(15.0)
Proceeds from (Payments for) Other Financing Activities	(0.1)	0.0
Net cash used in financing activities	(75.5)	(0.2)
Cash and cash equivalents:
Net change	41.0	99.6
Balance at beginning of period	32.4	17.0
Cash and cash equivalents at end of period	73.4	116.6
Supplemental cash flow information:
Interest paid, net of amounts capitalized	51.1	55.6
Income taxes paid / (refunded), net	0.1	0.5
Non-cash financing and investing activities:
Accruals for capital expenditures	8.3	10.0
THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from operating activities:
Net income	(497.9)	60.4
Adjustments to reconcile net income / (loss) to net cash from operating activities:
Depreciation and amortization	71.1	68.9
Deferred income taxes	(308.7)	(11.6)
Impairment of Long-Lived Assets Held-for-use	857.1	0.0
Changes in certain assets and liabilities:
Accounts receivable	20.5	16.2
Inventories	21.6	(4.7)
Prepaid taxes	2.7	(0.2)
Taxes applicable to subsequent years	40.7	37.4
Deferred regulatory costs, net	8.0	21.3
Accounts payable	(13.8)	3.3
Accrued taxes payable	(43.3)	(8.0)
Accrued interest payable	0.2	0.0
Pension, retiree and other benefits	(4.2)	3.8
Other	5.5	(18.9)
Net cash provided by operating activities	159.5	167.9
Cash flows from investing activities:
Capital expenditures	(71.8)	(63.3)
Insurance proceeds	3.4	3.8
Purchase of intangible assets	(0.3)	(0.2)
Increase in restricted cash	(16.1)	(8.4)
Other investing activities, net	0.8	0.4
Net cash used in investing activities	(84.0)	(67.7)
Cash flows from financing activities:
Borrowings from revolving credit facilities	0.0	15.0
Repayment of borrowings from revolving credit facilities	0.0	(15.0)
Dividends paid on common stock to parent	0.0	(20.0)
Issuance of short-term debt - related party	5.0	0.0
Repayment of short-term debt - related party	(40.0)	(0.1)
Dividends paid on preferred stock	(0.4)	(0.4)
Proceeds from (Payments for) Other Financing Activities	(0.1)	0.0
Net cash used in financing activities	(35.5)	(20.5)
Cash and cash equivalents:
Net change	40.0	79.7
Balance at beginning of period	5.4	5.4
Cash and cash equivalents at end of period	45.4	85.1
Supplemental cash flow information:
Interest paid, net of amounts capitalized	8.0	13.5
Income Taxes Paid, Net	0.1	0.5
Non-cash financing and investing activities:
Accruals for capital expenditures	$ 8.3	$ 10.0