Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues	$ 1,427.3	$ 1,612.8	$ 1,716.5
Cost of revenues:
Fuel	268.8	259.8	304.5
Purchased power	417.4	562.6	587.9
Total cost of revenues	686.2	822.4	892.4
Gross margin	741.1	790.4	824.1
Operating expenses:
Operation and maintenance	348.1	361.3	362.4
Depreciation and amortization	132.3	134.6	135.6
General taxes	85.7	87.0	87.8
Goodwill impairment (Note 7)	0.0	317.0	0.0
Fixed-asset impairment (Note 15)	859.0	0.0	11.5
Gain (Loss) on Sale of Assets and Asset Impairment Charges, excluding Discontinued Operations	0.1
Other	(49.2)	0.4	(3.9)
Total operating expenses	1,425.0	900.3	593.4
Operating income / (loss)	(683.9)	(109.9)	230.7
Other income / (expense), net
Investment income	0.4	0.2	0.9
Interest expense	(106.1)	(118.3)	(126.6)
Charge for early redemption of debt	(3.1)	(2.1)	(30.9)
Other deductions	(0.6)	(1.3)	(1.5)
Other expense, net	(109.4)	(121.5)	(158.1)
Income / (loss) from continuing operations before income tax	(793.3)	(231.4)	72.6
Income tax expense / (benefit) from continuing operations	(278.8)	20.0	15.4
Net income / (loss) from continuing operations	(514.5)	(251.4)	57.2
Income / (loss) from discontinued operations	(0.7)	11.4	(129.2)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	49.2	0.0	0.0
Income tax expense / (benefit)	19.2	(1.0)	2.6
Net income / (loss) from discontinued operations	29.3	12.4	(131.8)
Net loss	(485.2)	(239.0)	(74.6)
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	1,365.9	1,552.3	1,668.3
Cost of revenues:
Fuel	248.9	244.7	314.9
Purchased power	414.1	555.7	582.4
Total cost of revenues	663.0	800.4	897.3
Gross margin	702.9	751.9	771.0
Operating expenses:
Operation and maintenance	343.2	350.5	355.2
Depreciation and amortization	120.3	138.2	144.8
General taxes	83.8	85.0	85.7
Gain (Loss) on Contract Termination	(27.7)	0.0	0.0
Fixed-asset impairment (Note 15)	1,353.5	0.0	0.0
Gain (Loss) on Sale of Assets and Asset Impairment Charges, excluding Discontinued Operations	0.1
Other	0.0	0.4	(3.5)
Total operating expenses	1,873.0	574.1	582.2
Operating income / (loss)	(1,170.1)	177.8	188.8
Other income / (expense), net
Investment income	0.4	0.3	0.9
Interest expense	(24.5)	(30.9)	(33.9)
Charge for early redemption of debt	(0.5)	(5.0)	0.0
Other deductions	(0.4)	(0.7)	(1.1)
Other expense, net	(25.0)	(36.3)	(34.1)
Income / (loss) from continuing operations before income tax	(1,195.1)	141.5	154.7
Income tax expense / (benefit) from continuing operations	(422.4)	35.1	39.7
Dividends on preferred stock	0.7	0.9	0.9
Income / (loss) attributable to common stock	(773.4)	105.5	114.1
Net loss	$ (772.7)	$ 106.4	$ 115.0