Consolidated Statements of Results of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended		11 Months Ended
	Dec. 31, 2013 THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2012 THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2011 THE DAYTON POWER AND LIGHT COMPANY [Member]	Dec. 31, 2011 Successor [Member]	Dec. 31, 2013 Successor [Member]	Dec. 31, 2012 Successor [Member]	Nov. 27, 2011 Predecessor [Member]
Revenues	$ 1,551.5	$ 1,531.8	$ 1,677.7	$ 156.9	$ 1,636.9	$ 1,668.4	$ 1,670.9
Cost of revenues:
Fuel	362.5	354.9	380.6	35.8	366.7	361.9	355.8
Purchased power	381.9	309.5	401.6	36.7	389.0	342.1	404.6
Amortization of intangibles				11.6	7.1	95.1
Total cost of revenues	744.4	664.4	782.2	84.1	762.8	799.1	760.4
Gross margin	807.1	867.4	895.5	72.8	874.1	869.3	910.5
Operating expenses:
Operation and maintenance	362.1	385.9	364.8	47.5	396.7	406.4	377.8
Depreciation and amortization	140.2	141.3	134.9	11.6	132.9	125.4	129.4
General taxes	76.4	74.4	75.9	7.6	80.9	79.5	75.5
Goodwill Impairment					306.3	1,817.2
Fixed asset impairment	86.0	80.8			26.2
Total operating expenses	664.7	682.4	575.6	66.7	943.0	2,428.5	582.7
Operating income	142.4	185.0	319.9	6.1	(68.9)	(1,559.2)	327.8
Other income / (expense), net:
Investment income	2.0	2.3	17.3	0.1	1.4	2.5	0.4
Interest expense	(37.2)	(39.1)	(38.2)	(11.5)	(124.0)	(122.9)	(58.7)
Charge for early redemption of debt					(2.8)		(15.3)
Other deductions	(5.0)	(1.9)	(1.6)	(0.3)	(5.4)	(2.5)	(1.7)
Total other income / (expense), net	(40.2)	(38.7)	(22.5)	(11.7)	(130.8)	(122.9)	(75.3)
Earnings before income tax	102.2	146.3	297.4	(5.6)	(199.7)	(1,682.1)	252.5
Income tax expense	18.6	55.1	104.2	0.6	22.3	47.7	102.0
Net income	83.6	91.2	193.2	(6.2)	(222.0)	(1,729.8)	150.5
Dividends on preferred stock	0.9	0.9	0.9
Earnings on common stock	$ 82.7	$ 90.3	$ 192.3
Average number of common shares outstanding (millions):
Basic							114.5
Diluted							115.1
Earnings per share of common stock:
Basic							$ 1.31
Diluted							$ 1.31
Dividends paid per share of common stock							$ 1.54