Consolidated Statements of Results of Operations (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues	$ 374.9	$ 382.0	$ 769.5	$ 816.0
Cost of revenues:
Fuel	85.6	68.9	174.3	166.3
Purchased power	74.2	80.3	169.5	175.1
Amortization of intangibles	1.8	19.2	3.5	47.0
Total cost of revenues	161.6	168.4	347.3	388.4
Gross margin	213.3	213.6	422.2	427.6
Operating expenses:
Operation and maintenance	100.9	103.8	200.1	205.5
Depreciation and amortization	33.3	31.1	65.1	62.5
General taxes	20.5	21.3	41.4	43.0
Total operating expenses	154.7	156.2	306.6	311.0
Operating income	58.6	57.4	115.6	116.6
Other income / (expense), net:
Investment income	1.5	0.2	1.7	0.3
Interest expense	(29.6)	(32.4)	(60.1)	(62.0)
Other expense	(4.2)	(0.9)	(4.9)	(1.2)
Total other income / (expense), net	(32.3)	(33.1)	(63.3)	(62.9)
Earnings before income tax	26.3	24.3	52.3	53.7
Income tax expense	3.5	12.4	9.5	20.1
Net income	22.8	11.9	42.8	33.6
THE DAYTON POWER AND LIGHT COMPANY [Member]
Revenues	351.9	346.6	728.4	746.2
Cost of revenues:
Fuel	84.7	68.6	172.9	164.2
Purchased power	72.3	69.3	166.3	154.2
Total cost of revenues	157.0	137.9	339.2	318.4
Gross margin	194.9	208.7	389.2	427.8
Operating expenses:
Operation and maintenance	91.5	96.0	182.8	195.2
Depreciation and amortization	35.1	36.1	68.7	70.8
General taxes	19.4	19.6	39.2	39.8
Total operating expenses	146.0	151.7	290.7	305.8
Operating income	48.9	57.0	98.5	122.0
Other income / (expense), net:
Investment income	1.5	0.1	1.6	0.2
Interest expense	(10.0)	(9.4)	(19.3)	(19.0)
Other expense	(3.7)	(0.8)	(4.3)	(0.9)
Total other income / (expense), net	(12.2)	(10.1)	(22.0)	(19.7)
Earnings before income tax	36.7	46.9	76.5	102.3
Income tax expense	6.4	15.6	16.0	32.9
Net income	30.3	31.3	60.5	69.4
Dividends on preferred stock	0.2	0.2	0.4	0.4
Earnings on common stock	$ 30.1	$ 31.1	$ 60.1	$ 69.0