Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 672.7	$ 660.5	$ 743.7
Operating costs and expenses
Net fuel cost	0.5	1.7	2.5
Utilities Operating Expense, Purchased Power	276.3	230.6	251.9
Utilities Operating Expense, Maintenance and Operations	152.4	181.7	184.2
Depreciation and amortization	76.1	73.3	72.3
Taxes, Miscellaneous	82.1	79.4	77.9
Gain (Loss) on Disposition of Business	0.0	(4.7)	0.0
Costs and Expenses	587.4	571.4	588.8
Operating Income (Loss)	85.3	89.1	154.9
Other income / (expense), net
Interest expense	(62.9)	(71.3)	(82.2)
Loss on early extinguishment of debt	0.0	(31.7)	(44.9)
Other income	0.0	2.0	3.7
Other expense, net	(62.9)	(101.0)	(123.4)
Income / (loss) from continuing operations before income tax	22.4	(11.9)	31.5
Income tax benefit from continuing operations	(0.5)	(5.5)	(20.3)
Net income / (loss) from continuing operations	22.9	(6.4)	51.8
Income / (loss) from discontinued operations before income tax	(1.0)	(0.6)	47.6
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	0.0	6.1	20.1
Income tax expense / (benefit) from discontinued operations	(0.2)	0.1	14.1
Net income / (loss) from discontinued operations	(0.8)	5.4	53.6
Net loss	22.1	(1.0)	105.4
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	663.7	652.1	735.4
Operating costs and expenses
Net fuel cost	0.5	1.6	2.5
Utilities Operating Expense, Purchased Power	275.1	229.4	250.6
Utilities Operating Expense, Maintenance and Operations	152.1	182.0	183.1
Depreciation and amortization	74.6	71.8	70.8
Taxes, Miscellaneous	81.9	79.1	77.7
Gain (Loss) on Disposition of Business	0.0	(4.7)	0.0
Costs and Expenses	584.2	568.6	584.7
Operating Income (Loss)	79.5	83.5	150.7
Other income / (expense), net
Interest expense	(24.2)	(24.3)	(26.0)
Other income	(2.5)	(1.1)	(0.4)
Other expense, net	(26.7)	(25.4)	(26.4)
Income / (loss) from continuing operations before income tax	52.8	58.1	124.3
Income tax benefit from continuing operations	5.7	7.0	(0.6)
Net loss	$ 47.1	$ 51.1	$ 124.9