Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 5.4	$ 26.0
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	36.4	13.9
Gain (Loss) on Extinguishment of Debt	0.0	44.9
Deferred income taxes	33.5	8.6
Gain (Loss) on Disposition of Business, Including Discontinued Operation	(4.5)	(0.1)
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0.2	0.9
Changes in certain assets and liabilities:
Accounts receivable, net	(19.1)	(24.7)
Inventories	(4.7)	4.0
Taxes applicable to subsequent years	(36.8)	(37.5)
Deferred regulatory costs, net	19.5	6.7
Accounts payable	(10.1)	7.8
Accrued taxes payable / receivable	(13.0)	(41.7)
Accrued interest	0.3	(2.4)
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits	(9.3)	(8.7)
Other	(2.8)	1.7
Net Cash Provided by (Used in) Operating Activities	82.8	99.0
Cash flows from investing activities:
Capital expenditures	(84.0)	(63.4)
Payments for Removal Costs	(0.6)	0.0
Proceeds from Sale of Productive Assets	5.1	0.0
Other investing activities, net	(0.8)	(3.2)
Net cash used in investing activities	(80.3)	(66.6)
Cash flows from financing activities:
Payments of Deferred Finance Costs	(6.1)	(8.1)
Repayments of Lines of Credit	(219.0)	(10.0)
Proceeds from Issuance of Long-term Debt	415.0	821.7
Proceeds from Lines of Credit	75.0	73.0
Retirement of long-term debt, including early payment premium	0.0	(978.0)
Proceeds from Contributions from Parent	98.0	0.0
Proceeds from (Payments for) Other Financing Activities	(0.1)	(0.1)
Net cash provided by / (used in) financing activities	362.8	(101.5)
Cash, cash equivalents, and restricted cash:
Restricted Cash and Cash Equivalents	412.3	42.6
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	365.3	(69.1)
Supplemental cash flow information:
Interest paid, net of amounts capitalized	41.1	45.3
Non-cash financing and investing activities:
Accruals for capital expenditures	10.1	20.5
Non-cash Proceeds from Sale of Business	3.4	0.0
Income Taxes Paid, Net	(52.0)	0.9
THE DAYTON POWER AND LIGHT COMPANY [Member]
Cash flows from operating activities:
Net income	29.5	58.8
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	35.5	35.5
Deferred income taxes	1.2	(3.5)
Changes in certain assets and liabilities:
Accounts receivable, net	4.9	18.9
Inventories	1.3	(3.5)
Taxes applicable to subsequent years	36.8	36.2
Deferred regulatory costs, net	(19.5)	(6.7)
Accounts payable	(8.7)	6.0
Accrued taxes payable / receivable	(36.1)	(33.0)
Accrued interest	(0.1)	1.5
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits	(9.3)	(8.6)
Other	3.2	2.4
Net Cash Provided by (Used in) Operating Activities	38.7	104.0
Cash flows from investing activities:
Capital expenditures	(80.5)	(62.2)
Other investing activities, net	(0.7)	(3.2)
Net cash used in investing activities	(81.2)	(65.4)
Cash flows from financing activities:
Payments of Deferred Finance Costs	(0.3)	(3.8)
Repayments of Lines of Credit	(115.0)	0.0
Proceeds from Issuance of Long-term Debt	0.0	422.3
Proceeds from Lines of Credit	75.0	0.0
Retirement of long-term debt, including early payment premium	0.0	(436.1)
Proceeds from Contributions from Parent	150.0	0.0
Proceeds from (Payments for) Other Financing Activities	(0.1)	(0.1)
Net cash provided by / (used in) financing activities	95.4	(87.7)
Cash, cash equivalents, and restricted cash:
Restricted Cash and Cash Equivalents	74.2	17.1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	52.9	(49.1)
Supplemental cash flow information:
Interest paid, net of amounts capitalized	10.2	10.3
Proceeds from Income Tax Refunds	0.0	(12.0)
Non-cash financing and investing activities:
Accruals for capital expenditures	10.0	20.4
Payments of Ordinary Dividends, Common Stock	$ (14.2)	$ (70.0)