Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 31.8	$ 28.7
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	33.4	35.0
Charge for early redemption of debt	2.4	0.0
Deferred income taxes	(9.2)	(1.0)
Gain on sale of business	(49.2)	0.0
Changes in certain assets and liabilities:
Accounts receivable	35.8	3.8
Inventories	19.0	5.2
Prepaid taxes	0.2	0.6
Taxes applicable to subsequent years	21.6	19.1
Deferred regulatory costs, net	4.8	11.4
Accounts payable	(7.6)	(20.4)
Accrued taxes payable	(13.5)	(24.7)
Accrued interest payable	7.3	6.8
Unamortized Investment tax credit	(0.1)	0.0
Insurance claims costs	(0.4)	0.0
Pension, retiree and other benefits	(4.5)	2.0
Other	11.2	(0.6)
Net cash provided by operating activities	83.0	65.9
Cash flows from investing activities:
Capital expenditures	(37.7)	(33.7)
Proceeds from sale of business	75.5	0.0
Purchase of intangible assets	(0.1)	(0.2)
Increase / (decrease) in restricted cash	1.3	(0.8)
Other investing activities, net	0.6	0.3
Net cash provided by / (used in) investing activities	39.6	(34.4)
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)
Retirement of long-term debt	(75.4)	0.0
Net cash provided by / (used in) financing activities	(75.4)	0.0
Cash and cash equivalents:
Net change	47.2	31.5
Balance at beginning of period	32.4	17.0
Cash and cash equivalents at end of period	79.6	48.5
Supplemental cash flow information:
Interest paid, net of amounts capitalized	19.2	20.8
Income taxes paid / (refunded), net	0.0	0.0
Non-cash financing and investing activities:
Accruals for capital expenditures	12.5	11.2
THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from operating activities:
Net income	33.7	36.5
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	34.3	34.7
Deferred income taxes	(1.8)	(0.7)
Changes in certain assets and liabilities:
Accounts receivable	2.1	(1.3)
Inventories	19.1	5.2
Prepaid taxes	2.7	0.5
Taxes applicable to subsequent years	21.1	18.3
Deferred regulatory costs, net	4.8	11.4
Accounts payable	(9.8)	(20.2)
Accrued taxes payable	(28.2)	(20.6)
Accrued interest payable	(3.1)	(5.9)
Pension, retiree and other benefits	(4.5)	2.0
Other	13.0	(16.3)
Net cash provided by operating activities	83.4	43.6
Cash flows from investing activities:
Capital expenditures	(35.8)	(33.1)
Insurance proceeds	0.2	1.5
Purchase of intangible assets	(0.1)	(0.2)
Increase / (decrease) in restricted cash	1.4	(0.8)
Other investing activities, net	0.5	0.3
Net cash provided by / (used in) investing activities	(33.8)	(32.3)
Cash flows from financing activities:
Dividends paid on common stock to parent	0.0	(10.0)
Borrowings from revolving credit facilities	0.0	15.0
Issuance of short-term debt - related party	5.0	0.0
Repayment of short-term debt - related party	(35.0)	0.0
Dividends paid on preferred stock	(0.2)	(0.2)
Repayment of borrowings from revolving credit facilities	0.0	(15.0)
Net cash provided by / (used in) financing activities	(30.2)	(10.2)
Cash and cash equivalents:
Net change	19.4	1.1
Balance at beginning of period	5.4	5.4
Cash and cash equivalents at end of period	24.8	6.5
Supplemental cash flow information:
Interest paid, net of amounts capitalized	7.1	12.5
Non-cash financing and investing activities:
Accruals for capital expenditures	$ 12.5	$ 11.2