Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues	$ 372.9	$ 390.1	$ 867.4	$ 850.4
Cost of revenues:
Fuel	54.4	60.8	130.8	150.8
Purchased power	120.6	138.4	314.8	312.5
Amortization of intangibles	0.0	0.3	0.0	0.6
Total cost of revenues	175.0	199.5	445.6	463.9
Gross margin	197.9	190.6	421.8	386.5
Operating expenses:
Operation and maintenance	88.4	96.0	180.1	200.7
Depreciation and amortization	34.3	33.9	69.3	69.2
General taxes	22.9	21.5	47.0	49.1
Goodwill impairment	0.0	0.0	0.0	135.8
Fixed-asset impairment	0.0	0.0	0.0	11.5
Other	(0.8)	(0.3)	(0.3)	1.4
Total operating expenses	144.8	151.1	296.1	467.7
Operating income / (loss)	53.1	39.5	125.7	(81.2)
Other income / (expense), net
Investment income / (loss)	0.2	0.0	0.0	0.4
Interest expense	(30.9)	(31.9)	(61.4)	(62.7)
Other expense	(0.2)	(1.9)	(0.7)	(1.0)
Total other expense, net	(30.9)	(33.8)	(62.1)	(63.3)
Earnings / (loss) before income taxes	22.2	5.7	63.6	(144.5)
Income tax expense / (benefit)	0.5	(28.1)	13.2	70.7
Net income / (loss)	21.7	33.8	50.4	(215.2)
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	352.1	365.5	813.4	797.6
Cost of revenues:
Fuel	50.6	58.6	119.9	142.9
Purchased power	120.1	136.9	309.8	304.9
Total cost of revenues	170.7	195.5	429.7	447.8
Gross margin	181.4	170.0	383.7	349.8
Operating expenses:
Operation and maintenance	83.2	84.6	167.1	180.0
Depreciation and amortization	34.2	35.3	68.9	71.8
General taxes	21.9	20.5	44.9	46.9
Other	0.0	1.1	0.4	1.4
Total operating expenses	139.3	141.5	281.3	300.1
Operating income / (loss)	42.1	28.5	102.4	49.7
Other income / (expense), net
Investment income / (loss)	0.3	0.1	0.2	0.4
Interest expense	(9.0)	(8.3)	(17.7)	(16.1)
Other expense	(0.1)	(0.4)	(0.3)	(0.7)
Total other expense, net	(8.8)	(8.6)	(17.8)	(16.4)
Earnings / (loss) before income taxes	33.3	19.9	84.6	33.3
Income tax expense / (benefit)	9.4	6.0	24.2	10.0
Net income / (loss)	23.9	13.9	60.4	23.3
Dividends on preferred stock	0.2	0.2	0.4	0.4
Income attributable to common stock	$ 23.7	$ 13.7	$ 60.0	$ 22.9