Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income / (loss)	$ (4.7)	$ 22.1	$ (1.0)
Adjustments to reconcile Net income / (loss) to Net cash from operating activities
Depreciation and amortization	80.0	76.1	73.6
Deferred income taxes	(2.0)	4.7	39.8
Loss on early extinguishment of debt	0.1	0.0	31.7
Gain (Loss) on Disposition of Business	(0.6)	0.0	(1.4)
Gain (Loss) on Disposition of Business	0.6	0.0	(4.7)
Changes in certain assets and liabilities:
Accounts receivable, net	(20.4)	(2.0)	11.2
Inventories	(12.5)	(5.5)	4.9
Taxes applicable to subsequent years	(10.9)	(5.2)	(0.2)
Deferred regulatory costs, net	38.4	10.3	(34.0)
Accounts payable	14.0	15.7	(10.1)
Accrued taxes payable / receivable	5.8	20.6	8.0
Accrued interest	0.8	(0.7)	4.6
Accrued pension and other postretirement obligations	(11.4)	(12.2)	(11.8)
Other	4.0	(3.0)	0.9
Net cash provided by operating activities	86.4	116.9	113.9
Cash flows from investing activities:
Capital expenditures	(287.3)	(191.3)	(157.3)
Proceeds from disposal and sale of business interests	0.5	0.0	1.6
Payments for Removal Costs	(0.6)	(3.9)	(8.9)
Proceeds from Sale of Property, Plant, and Equipment	0.0	0.0	(5.1)
Payments for (Proceeds from) Removal Costs	(22.4)	(17.2)	(25.5)
Other investing activities, net	(0.1)	(0.6)	(0.7)
Net cash used in investing activities	(309.9)	(213.0)	(185.7)
Cash flows from financing activities:
Deferred financing costs	(2.6)	(0.2)	(7.8)
Retirement of debt	0.0	0.0	(550.8)
Equity Contribution from Parent	0.0	132.5	98.0
Premium paid for early redemption of debt	0.0	0.0	(0.1)
Issuance of long-term debt	140.0	0.0	555.0
Borrowings from revolving credit facilities	255.0	120.0	185.0
Repayment of borrowings from revolving credit facilities	(165.0)	(155.0)	(229.0)
Net cash from financing activities	227.4	97.3	50.3
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	3.9	1.2	(21.5)
Cash and cash equivalents:
Restricted Cash and Cash Equivalents	30.6	26.7	25.5
Supplemental cash flow information:
Interest paid, net of amounts capitalized	62.0	59.3	67.8
Income taxes paid / (refunded), net	0.0	(17.5)	(51.9)
Non-cash financing and investing activities:
Accruals for capital expenditures	47.0	42.6	31.7
Non-cash capital contribution		132.5	98.0
Accruals from sale of business	0.0	0.0	2.2
Increase (Decrease) in Other Noncurrent Assets	5.8	(4.0)	(2.3)
THE DAYTON POWER AND LIGHT COMPANY [Member]
Net income / (loss)	18.9	47.1	51.1
Adjustments to reconcile Net income / (loss) to Net cash from operating activities
Depreciation and amortization	78.7	74.6	71.8
Deferred income taxes	(2.3)	4.5	3.4
Loss on early extinguishment of debt	0.1	0.0	0.0
Gain (Loss) on Disposition of Business	0.6	0.0	(4.7)
Changes in certain assets and liabilities:
Accounts receivable, net	20.5	1.9	(0.7)
Inventories	12.5	5.5	(1.4)
Taxes applicable to subsequent years	10.9	5.4	0.2
Deferred regulatory costs, net	(38.4)	(10.3)	34.0
Accounts payable	13.6	15.1	(4.0)
Accrued taxes payable / receivable	12.5	10.0	4.5
Accrued interest	0.8	0.0	1.3
Accrued pension and other postretirement obligations	(11.4)	(12.2)	(11.8)
Other	(7.2)	1.5	(6.0)
Net cash provided by operating activities	117.6	130.2	91.0
Cash flows from investing activities:
Capital expenditures	(283.7)	(189.3)	(153.3)
Payments for Removal Costs	0.0	0.0	(7.0)
Payments for (Proceeds from) Removal Costs	(22.4)	(17.1)	(25.5)
Other investing activities, net	0.4	0.9	(0.7)
Net cash used in investing activities	(305.7)	(205.5)	(186.5)
Cash flows from financing activities:
Deferred financing costs	(2.6)	0.0	(1.2)
Retirement of debt	0.0	0.0	(140.0)
Equity Contribution from Parent	0.0	150.0	150.0
Premium paid for early redemption of debt	0.0	0.0	(0.1)
Issuance of long-term debt	140.0	0.0	140.0
Borrowings from revolving credit facilities	255.0	120.0	95.0
Repayment of borrowings from revolving credit facilities	(135.0)	(140.0)	(115.0)
Dividends paid on common stock to parent	(64.0)		(42.7)
Net cash from financing activities	193.4	78.0	86.0
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	5.3	2.7	(9.5)
Cash and cash equivalents:
Restricted Cash and Cash Equivalents	19.8	14.5	11.8
Supplemental cash flow information:
Interest paid, net of amounts capitalized	15.9	21.2	19.3
Income taxes paid / (refunded), net	0.0	0.0	0.1
Non-cash financing and investing activities:
Accruals for capital expenditures	47.0	42.5	31.6
Increase (Decrease) in Other Noncurrent Assets	$ 5.6	$ (4.9)	$ (3.9)