Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues	$ 298.1	$ 328.3	$ 622.0	$ 692.3
Cost of revenues:
Fuel	54.0	60.2	108.1	127.1
Purchased power	77.4	96.9	179.4	218.8
Total cost of revenues	131.4	157.1	287.5	345.9
Gross margin	166.7	171.2	334.5	346.4
Operating expenses:
Operation and maintenance	82.1	77.2	168.4	165.7
Depreciation and amortization	26.5	36.0	54.5	69.4
General taxes	24.0	21.6	48.2	42.6
Impairment of Long-Lived Assets Held-for-use	0.0	235.5	66.4	235.5
Other	(3.2)	0.0	16.2	0.1
Other Operating Income (Expense), Net	0.3		(0.9)	0.0
Total operating expenses	129.7	370.3	352.8	513.3
Operating income / (loss)	37.0	(199.1)	(18.3)	(166.9)
Other income / (expense), net
Investment income	0.1	0.3	0.1	0.2
Interest expense	(27.4)	(26.0)	(54.3)	(52.3)
Charge for early retirement of debt	(0.3)	0.0	(0.3)	(2.6)
Other deductions	(0.6)	(0.3)	(1.6)	(0.7)
Total other expense	(28.2)	(26.0)	(56.1)	(55.4)
Income / (loss) from continuing operations before income tax	8.8	(225.1)	(74.4)	(222.3)
Income tax expense / (benefit) from continuing operations	8.3	(88.3)	(23.2)	(87.7)
Net income / (loss) from continuing operations	0.5	(136.8)	(51.2)	(134.6)
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)	0.5	(136.8)	(51.2)	(105.0)
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	284.1	313.7	595.2	662.9
Cost of revenues:
Fuel	49.9	55.6	100.0	118.5
Purchased power	76.4	96.7	177.2	218.0
Total cost of revenues	126.3	152.3	277.2	336.5
Gross margin	157.8	161.4	318.0	326.4
Operating expenses:
Operation and maintenance	80.9	76.4	163.5	162.5
Depreciation and amortization	22.0	36.8	45.5	71.1
General taxes	23.6	21.1	47.2	41.6
Impairment of Long-Lived Assets Held-for-use	0.0	857.1	66.3	857.1
Gain on termination of contract	0.0	0.0	0.0	(27.7)
Other	(3.2)	0.1	16.2	0.2
Total operating expenses	123.3	991.5	338.7	1,104.8
Operating income / (loss)	34.5	(830.1)	(20.7)	(778.4)
Other income / (expense), net
Investment income	0.1	0.3	0.1	0.2
Interest expense	(7.8)	(5.4)	(15.4)	(10.7)
Charge for early retirement of debt	(0.1)	0.0	(0.1)	0.0
Other deductions	(0.4)	(0.1)	(1.3)	(0.3)
Total other expense	(8.2)	(5.2)	(16.7)	(10.8)
Income / (loss) from continuing operations before income tax	26.3	(835.3)	(37.4)	(789.2)
Income tax expense / (benefit) from continuing operations	10.2	(303.7)	(11.7)	(291.3)
Net income / (loss)	16.1	(531.6)	(25.7)	(497.9)
Dividends on preferred stock	0.0	0.2	0.0	0.4
Income / (loss) attributable to common stock	$ 16.1	$ (531.8)	$ (25.7)	$ (498.3)