Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 178.1	$ 174.5	$ 383.8	$ 370.0
Cost of revenues:
Net fuel cost	3.6	2.3	8.1	4.3
Net purchased power cost	69.3	66.7	155.3	148.1
Total cost of revenues	72.9	69.0	163.4	152.4
Gross margin	105.2	105.5	220.4	217.6
Operating expenses:
Operation and maintenance	45.0	48.1	81.0	96.4
Depreciation and amortization	20.3	18.8	39.1	37.1
General taxes	16.1	20.2	35.5	39.2
Impairment of Long-Lived Assets Held-for-use			1.2	66.4
Other			1.1	16.2
Other Operating Income (Expense), Net	(1.2)	0.0	(13.0)	0.0
Gain (Loss) on Disposition of Business			(13.5)	0.0
Total operating expenses	82.6	87.1	168.6	172.7
Operating loss	22.6	18.4	51.8	44.9
Other income / (expense), net
Investment loss	0.3	0.1	0.2	0.1
Interest expense	(24.0)	(27.6)	(51.8)	(54.9)
Charge for early redemption of debt	(5.7)	(0.3)	(6.4)	(0.3)
Other expense	(0.1)	0.3	0.1	0.1
Total other expense, net	(29.5)	(27.5)	(57.9)	(55.0)
Loss from continuing operations before income tax	(6.9)	(9.1)	(6.1)	(10.1)
Income tax benefit from continuing operations	(1.5)	(2.7)	(1.6)	(3.3)
Net loss from continuing operations	(5.4)	(6.4)	(4.5)	(6.8)
Loss from discontinued operations	10.0	17.8	31.7	(64.4)
Income tax benefit for discontinued operations	1.1	10.9	4.9	(20.0)
Net income from discontinued operations	8.9	6.9	24.9	(44.4)
Net loss	3.5	0.5	20.4	(51.2)
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	168.8	168.2	364.8	358.3
Cost of revenues:
Net fuel cost	0.7	0.0	1.6	0.0
Net purchased power cost	68.9	66.5	152.7	147.6
Total cost of revenues	69.6	66.5	154.3	147.6
Gross margin	99.2	101.7	210.5	210.7
Operating expenses:
Operation and maintenance	39.9	40.1	72.1	78.1
Depreciation and amortization	18.8	18.6	37.4	36.7
General taxes	16.0	19.6	35.3	38.5
Impairment of Long-Lived Assets Held-for-use			0.0	66.3
Gain (Loss) on Sale of Assets and Asset Impairment Charges, excluding Discontinued Operations	(0.1)	0.0	(0.1)	0.0
Other			0.1	16.2
Gain (Loss) on Disposition of Business	0.0	0.0	(12.4)	0.0
Total operating expenses	74.8	78.3	157.3	153.3
Operating loss	24.4	23.4	53.2	57.4
Other income / (expense), net
Investment loss	0.2	0.1	0.1	0.1
Interest expense	(6.5)	(8.0)	(14.7)	(15.6)
Charge for early redemption of debt	(0.1)	(0.1)	(0.6)	(0.1)
Other expense	(0.9)	(0.3)	(1.6)	(1.7)
Total other expense, net	(7.3)	(8.3)	(16.8)	(17.3)
Loss from continuing operations before income tax	17.1	15.1	36.4	40.1
Income tax benefit from continuing operations	2.1	3.8	5.7	11.8
Net loss from continuing operations	15.0	11.3	30.7	28.3
Loss from discontinued operations	0.0	11.2	0.0	(77.5)
Income tax benefit for discontinued operations	0.0	6.4	0.0	(23.5)
Net income from discontinued operations	0.0	4.8	0.0	(54.0)
Net loss	$ 15.0	$ 16.1	$ 30.7	$ (25.7)