Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 209.0	$ 207.4
Cost of revenues:
Net fuel cost	3.5	4.5
Cost of Goods and Services Sold	77.7	90.5
Gross margin	131.3	116.9
Operating expenses:
Operation and maintenance	51.0	36.0
Depreciation and amortization	18.4	18.8
General taxes	19.5	19.4
Gain (Loss) on Sale of Assets and Asset Impairment Charges, excluding Discontinued Operations	0.9	0.1
Other, net (Note 2):	(0.9)	(0.6)
Gain (Loss) on Disposition of Business	0.0	(11.7)
Total operating expenses	89.8	86.0
Operating income	41.5	30.9
Other income / (expense), net
Interest expense	(23.7)	(27.8)
Charge for early redemption of debt	0.0	(0.7)
Other income	1.4	0.1
Total other expense, net	(22.3)	(28.4)
Income / (loss) from continuing operations before income tax	19.2	2.5
Income tax expense / (benefit) from continuing operations	2.7	0.2
Net income / (loss) from continuing operations	16.5	2.3
Income / (loss) from discontinued operations before income tax	29.8	20.0
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	0.1	(1.9)
Income tax expense / (benefit) from discontinued operations	4.3	3.5
Net income / (loss) from discontinued operations	25.6	14.6
Net income / (loss)	42.1	16.9
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	201.4	196.0
Cost of revenues:
Net fuel cost	0.9	0.9
Cost of Goods and Services Sold	74.2	84.7
Gross margin	127.2	111.3
Operating expenses:
Operation and maintenance	48.2	32.2
Depreciation and amortization	18.0	18.6
General taxes	19.4	19.3
Gain (Loss) on Disposition of Business	0.0	(12.4)
Total operating expenses	85.6	82.5
Operating income	41.6	28.8
Other income / (expense), net
Interest expense	(7.1)	(8.2)
Charge for early redemption of debt	0.0	(0.5)
Other income	0.6	(0.8)
Total other expense, net	(6.5)	(9.5)
Income / (loss) from continuing operations before income tax	35.1	19.3
Income tax expense / (benefit) from continuing operations	6.1	3.6
Net income / (loss)	29.0	15.7
Electricity, Purchased [Member]
Cost of revenues:
Cost of Goods and Services Sold	74.2	86.0
Electricity, Purchased [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]
Cost of revenues:
Cost of Goods and Services Sold	$ 73.3	$ 83.8