Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues	$ 323.9	$ 389.3	$ 945.9	$ 1,081.6
Cost of revenues:
Net fuel cost	57.3	78.9	165.4	206.0
Net purchased power cost	84.0	111.7	263.4	330.5
Total cost of revenues	141.3	190.6	428.8	536.5
Gross margin	182.6	198.7	517.1	545.1
Operating expenses:
Operation and maintenance	81.9	91.5	250.3	257.2
Depreciation and amortization	27.3	30.9	81.8	100.3
General taxes	20.1	21.6	68.3	64.2
Impairment of Long-Lived Assets Held-for-use	0.0	0.0	66.4	235.5
Other	(0.3)	0.0	15.9	0.1
Other Operating Income (Expense), Net	(5.2)	(0.7)	(6.1)	(0.7)
Total operating expenses	123.8	143.3	476.6	656.6
Operating income / (loss)	58.8	55.4	40.5	(111.5)
Other income / (expense), net
Investment income	0.1	0.1	0.2	0.3
Interest expense	(27.2)	(27.0)	(81.5)	(79.3)
Charge for early redemption of debt	(3.0)	(0.5)	(3.3)	(3.1)
Other expense	(0.7)	(0.2)	(2.3)	(0.9)
Total other expense, net	(30.8)	(27.6)	(86.9)	(83.0)
Income / (loss) from continuing operations before income tax	28.0	27.8	(46.4)	(194.5)
Income tax expense / (benefit) from continuing operations	6.1	12.7	(17.1)	(75.0)
Net income / (loss) from continuing operations	21.9	15.1	(29.3)	(119.5)
Loss from discontinued operations	0.0	0.0	0.0	(0.7)
Gain from disposal of discontinued operations	0.0	0.0	0.0	49.2
Income tax expense for discontinued operations	0.0	0.0	0.0	18.9
Net income from discontinued operations	0.0	0.0	0.0	29.6
Net income / (loss)	21.9	15.1	(29.3)	(89.9)
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	305.6	368.4	900.8	1,031.3
Cost of revenues:
Net fuel cost	52.8	71.0	152.8	189.5
Net purchased power cost	83.5	110.0	260.7	328.0
Total cost of revenues	136.3	181.0	413.5	517.5
Gross margin	169.3	187.4	487.3	513.8
Operating expenses:
Operation and maintenance	81.7	85.5	245.2	248.0
Depreciation and amortization	22.7	24.1	68.2	95.2
General taxes	19.6	21.2	66.8	62.8
Impairment of Long-Lived Assets Held-for-use	0.0	0.0	66.3	857.1
Gain on termination of contract	0.0	0.0	0.0	(27.7)
Other	(0.3)	0.0	15.9	0.2
Other Operating Income (Expense), Net	(4.4)	0.0	(4.4)	0.0
Total operating expenses	119.3	130.8	458.0	1,235.6
Operating income / (loss)	50.0	56.6	29.3	(721.8)
Other income / (expense), net
Investment income	0.1	0.1	0.2	0.3
Interest expense	(7.7)	(6.5)	(23.1)	(17.2)
Charge for early redemption of debt	(1.0)	(0.5)	(1.1)	(0.5)
Other expense	(0.2)	0.1	(1.5)	(0.2)
Total other expense, net	(8.8)	(6.8)	(25.5)	(17.6)
Income / (loss) from continuing operations before income tax	41.2	49.8	3.8	(739.4)
Income tax expense / (benefit) from continuing operations	11.9	19.7	0.2	(271.6)
Net income / (loss)	29.3	30.1	3.6	(467.8)
Dividends on preferred stock	0.0	0.3	0.0	0.7
Income / (loss) attributable to common stock	$ 29.3	$ 29.8	$ 3.6	$ (468.5)