Consolidated Statements of Comprehensive Income/(Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$ 33.8	$ 22.8	$ (215.2)	$ 42.8
Available-for-sale securities activity:
Change in fair value of available-for-sale securities	0.1	(1.9)	(0.2)	(1.6)
Reclassification to earnings of available-for-sale securities, net of income tax expense/(benefit)		1.0	0.2	1.1
Total change in fair value of available-for-sale securities	0.1	(0.9)		(0.5)
Derivative activity:
Change in derivative fair value	(12.1)	11.2	(25.0)	12.4
Reclassification of earnings, net of income tax (expense)/benefit of $0.6 and $(0.3), respectively	5.3	1.6	10.8	1.8
Total change in fair value of derivatives	(6.8)	12.8	(14.2)	14.2
Pension and postretirement activity:
Reclassification to earnings of Pension				0.3
Total change in unfunded pension obligation				0.3
Other comprehensive income / (loss)	(6.7)	11.9	(14.2)	14.0
Net comprehensive income / (loss)	27.1	34.7	(229.4)	56.8
THE DAYTON POWER AND LIGHT COMPANY [Member]
Net income	13.9	30.3	23.3	60.5
Available-for-sale securities activity:
Change in fair value of available-for-sale securities	0.1	(1.9)	(0.2)	(1.6)
Reclassification to earnings of available-for-sale securities, net of income tax expense/(benefit)		1.0	0.2	1.1
Total change in fair value of available-for-sale securities	0.1	(0.9)		(0.5)
Derivative activity:
Change in derivative fair value	(14.8)	3.1	(27.7)	0.5
Reclassification of earnings, net of income tax (expense)/benefit of $0.6 and $(0.3), respectively	6.4	1.3	12.1	1.1
Total change in fair value of derivatives	(8.4)	4.4	(15.6)	1.6
Pension and postretirement activity:
Prior service cost for the period		0.9		1.8
Reclassification to earnings of Pension	0.8		1.4
Total change in unfunded pension obligation	0.8	0.9	1.4	1.8
Other comprehensive income / (loss)	(7.5)	4.4	(14.2)	2.9
Net comprehensive income / (loss)	$ 6.4	$ 34.7	$ 9.1	$ 63.4