Consolidated Statements of Results of Operations (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues	$ 460.3	$ 394.6
Cost of revenues:
Fuel	90.0	88.6
Purchased power	174.1	95.3
Amortization of intangibles	0.3	1.8
Total cost of revenues	264.4	185.7
Gross margin	195.9	208.9
Operating expenses:
Operation and maintenance	104.7	99.2
Depreciation and amortization	35.3	31.8
General taxes	27.6	21.0
Goodwill Impairment	135.8
Fixed asset impairment	11.5
Total operating expenses	314.9	152.0
Operating income	(119.0)	56.9
Other income / (expense), net:
Investment income	0.4	0.1
Interest expense	(30.8)	(30.5)
Other deductions	(0.8)	(0.6)
Total other income / (expense), net	(31.2)	(31.0)
Earnings before income tax	(150.2)	25.9
Income tax expense	98.8	6.0
Net income	(249.0)	19.9
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	432.1	376.5
Cost of revenues:
Fuel	84.3	88.1
Purchased power	168.0	94.1
Total cost of revenues	252.3	182.2
Gross margin	179.8	194.3
Operating expenses:
Operation and maintenance	95.4	91.3
Depreciation and amortization	36.5	33.6
General taxes	26.4	19.8
Total operating expenses	158.3	144.7
Operating income	21.5	49.6
Other income / (expense), net:
Investment income	0.3	0.1
Interest expense	(7.8)	(9.3)
Other deductions	(0.6)	(0.6)
Total other income / (expense), net	(8.1)	(9.8)
Earnings before income tax	13.4	39.8
Income tax expense	4.0	9.6
Net income	9.4	30.2
Dividends on preferred stock	0.2	0.2
Earnings on common stock	$ 9.2	$ 30.0