Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 861.0	$ 869.0	$ 672.7
OPERATING COSTS AND EXPENSES:
Net fuel cost	0.0	0.1	0.5
Utilities Operating Expense, Purchased Power	346.9	470.2	276.3
Utilities Operating Expense, Maintenance and Operations	232.1	184.7	152.4
Depreciation and amortization	82.1	80.0	76.1
Taxes, Miscellaneous	100.8	85.3	82.1
Gain (Loss) on Disposition of Business	0.0	0.6	0.0
Costs and Expenses	761.9	819.7	587.4
Operating Income (Loss)	99.1	49.3	85.3
OTHER (EXPENSE) / INCOME, NET:
Interest expense, net	(63.6)	(67.8)	(62.9)
Other income, net	6.8	4.2	0.0
Total other expense, net	(56.8)	(63.6)	(62.9)
INCOME / (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAX	42.3	(14.3)	22.4
Income tax expense / (benefit) from continuing operations	6.6	(9.6)	(0.5)
NET INCOME / (LOSS) FROM CONTINUING OPERATIONS	35.7	(4.7)	22.9
Loss from discontinued operations before income tax	0.0	0.0	(1.0)
Income tax benefit from discontinued operations	0.0	0.0	(0.2)
Net loss from discontinued operations	0.0	0.0	(0.8)
Net loss	35.7	(4.7)	22.1
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	852.0	860.1	663.7
OPERATING COSTS AND EXPENSES:
Net fuel cost	0.0	0.0	0.5
Utilities Operating Expense, Purchased Power	346.0	469.0	275.1
Utilities Operating Expense, Maintenance and Operations	229.8	185.1	152.1
Depreciation and amortization	80.7	78.7	74.6
Taxes, Miscellaneous	100.6	85.1	81.9
Gain (Loss) on Disposition of Business	0.0	0.6	0.0
Costs and Expenses	757.1	817.3	584.2
Operating Income (Loss)	94.9	42.8	79.5
OTHER (EXPENSE) / INCOME, NET:
Interest expense, net	(25.8)	(28.8)	(24.2)
Other income, net	5.8	1.8	(2.5)
Total other expense, net	(20.0)	(27.0)	(26.7)
INCOME / (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAX	74.9	15.8	52.8
Income tax expense / (benefit) from continuing operations	13.5	(3.1)	5.7
Net loss	$ 61.4	$ 18.9	$ 47.1