Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues	$ 293.2	$ 323.9
Cost of revenues:
Net fuel cost	33.8	54.1
Net purchased power cost	97.8	102.0
Total cost of revenues	131.6	156.1
Gross margin	161.6	167.8
Operating expenses:
Operation and maintenance	55.1	82.7
Depreciation and amortization	20.1	28.0
General taxes	22.4	24.2
Impairment of Long-Lived Assets Held-for-use	0.0	66.4
Other	0.6	19.4
Other Operating Income (Expense), Net	14.9	18.2
Total operating expenses	112.5	219.5
Operating loss	49.1	(51.7)
Other income / (expense), net
Investment loss	(0.1)	0.0
Interest expense	(28.0)	(27.3)
Charge for early redemption of debt	(0.7)	0.0
Other expense	0.2	(4.2)
Total other expense, net	(28.6)	(31.5)
Loss from continuing operations before income tax	20.5	(83.2)
Income tax benefit from continuing operations	3.6	(31.5)
Net loss	16.9	(51.7)
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	196.0	190.1
Cost of revenues:
Net fuel cost	0.9	0.0
Net purchased power cost	83.8	81.1
Total cost of revenues	84.7	81.1
Gross margin	111.3	109.0
Operating expenses:
Operation and maintenance	32.2	38.0
Depreciation and amortization	18.6	18.1
General taxes	19.3	18.9
Impairment of Long-Lived Assets Held-for-use	0.0	66.3
Other	0.0	19.4
Other Operating Income (Expense), Net	12.4	0.0
Total operating expenses	82.5	75.0
Operating loss	28.8	34.0
Other income / (expense), net
Investment loss	(0.1)	0.0
Interest expense	(8.2)	(7.6)
Charge for early redemption of debt	(0.5)	0.0
Other expense	(0.7)	(1.4)
Total other expense, net	(9.5)	(9.0)
Loss from continuing operations before income tax	19.3	25.0
Income tax benefit from continuing operations	3.6	8.0
Net loss from continuing operations	15.7	17.0
Loss from discontinued operations	0.0	(88.7)
Income tax benefit for discontinued operations	0.0	(29.9)
Net income from discontinued operations	0.0	(58.8)
Net loss	$ 15.7	$ (41.8)