Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income	$ 31.8	$ 28.7
Available-for-sale securities activity:
Change in fair value of available-for-sale securities, net of income tax	0.2	0.5
Reclassification to earnings, net of income tax	(0.1)	(0.4)
Total change in fair value of available-for-sale securities	0.1	0.1
Derivative activity:
Change in derivative fair value, net of income tax	21.5	0.1
Reclassification of earnings, net of income tax	(8.2)	0.6
Total change in fair value of derivatives	13.3	0.7
Pension and postretirement activity:
Reclassification to earnings, net of income tax	0.0	0.1
Total change in unfunded pension obligation	0.0	0.1
Other comprehensive income	13.4	0.9
Net comprehensive income	45.2	29.6
THE DAYTON POWER AND LIGHT COMPANY [Member]
Net income	33.7	36.5
Available-for-sale securities activity:
Change in fair value of available-for-sale securities, net of income tax	0.2	0.5
Reclassification to earnings, net of income tax	(0.1)	(0.4)
Total change in fair value of available-for-sale securities	0.1	0.1
Derivative activity:
Change in derivative fair value, net of income tax	21.5	0.1
Reclassification of earnings, net of income tax	(8.4)	0.5
Total change in fair value of derivatives	13.1	0.6
Pension and postretirement activity:
Reclassification to earnings, net of income tax	0.3	0.9
Total change in unfunded pension obligation	0.3	0.9
Other comprehensive income	13.5	1.6
Net comprehensive income	$ 47.2	$ 38.1