Consolidated Statements of Comprehensive Income/(Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income	$ (249.0)	$ 19.9
Available-for-sale securities activity:
Change in fair value of available-for-sale securities	(0.3)	0.2
Reclassification to earnings of available-for-sale securities, net of income tax expense/(benefit)	0.2	0.1
Total change in fair value of available-for-sale securities	(0.1)	0.3
Derivative activity:
Change in derivative fair value	(12.9)	1.2
Reclassification of earnings, net of income tax (expense)/benefit of $0.6 and $(0.3), respectively	5.5	0.2
Total change in fair value of derivatives	(7.4)	1.4
Pension and postretirement activity:
Reclassification to earnings of Pension		0.3
Total change in unfunded pension obligation		0.3
Other comprehensive income / (loss)	(7.5)	2.0
Net comprehensive income / (loss)	(256.5)	21.9
THE DAYTON POWER AND LIGHT COMPANY [Member]
Net income	9.4	30.2
Available-for-sale securities activity:
Change in fair value of available-for-sale securities	(0.3)	0.2
Reclassification to earnings of available-for-sale securities, net of income tax expense/(benefit)	0.2	0.1
Total change in fair value of available-for-sale securities	(0.1)	0.3
Derivative activity:
Change in derivative fair value	(12.9)	(2.6)
Reclassification of earnings, net of income tax (expense)/benefit of $0.6 and $(0.3), respectively	5.7	(0.2)
Total change in fair value of derivatives	(7.2)	(2.8)
Pension and postretirement activity:
Prior service cost for the period		0.9
Reclassification to earnings of Pension	0.6
Total change in unfunded pension obligation	0.6	0.9
Other comprehensive income / (loss)	(6.7)	(1.6)
Net comprehensive income / (loss)	$ 2.7	$ 28.6