Consolidated Statements of Comprehensive Income/(Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net loss	$ (239.0)	$ (74.6)	$ (222.0)
Available-for-sale securities activity:
Change in fair value of available-for-sale securities, net of income tax benefit/(expense)	(0.1)	(0.3)	(1.2)
Reclassification to earnings of available-for-sale securities, net of income tax expense/(benefit)	0.0	0.2	1.4
Total change in fair value of available-for-sale securities	(0.1)	(0.1)	0.2
Derivative activity:
Change in derivative fair value, net of income tax benefit/(expense)	18.2	(19.0)	19.7
Reclassification of earnings, net of income tax benefit/(expense)	(10.0)	16.9	3.4
Total change in fair value of derivatives	8.2	(2.1)	23.1
Pension and postretirement activity:
Prior service cost for the period, net of income tax benefit/(expense)	0.0	(2.2)	0.0
Net loss for the period, net of income tax benefit/(expense)	1.6	(12.7)	4.9
Reclassification to earnings, net of income tax benefit/(expense)	0.2	0.0	0.3
Total change in unfunded pension obligation	1.8	(14.9)	5.2
Other comprehensive income / (loss)	9.9	(17.1)	28.5
Net comprehensive income / (loss)	(229.1)	(91.7)	(193.5)
THE DAYTON POWER AND LIGHT COMPANY [Member]
Net loss	106.4	115.0	83.6
Available-for-sale securities activity:
Change in fair value of available-for-sale securities, net of income tax benefit/(expense)	(0.2)	(0.3)	(1.6)
Reclassification to earnings of available-for-sale securities, net of income tax expense/(benefit)	0.0	0.2	1.4
Total change in fair value of available-for-sale securities	(0.2)	(0.1)	(0.2)
Derivative activity:
Change in derivative fair value, net of income tax benefit/(expense)	18.2	(18.8)	1.0
Reclassification of earnings, net of income tax benefit/(expense)	(9.8)	15.4	2.6
Total change in fair value of derivatives	8.4	(3.4)	3.6
Pension and postretirement activity:
Prior service cost for the period, net of income tax benefit/(expense)	0.0	(2.3)	0.5
Net loss for the period, net of income tax benefit/(expense)	1.7	(12.5)	4.3
Reclassification to earnings, net of income tax benefit/(expense)	3.7	2.7	3.8
Total change in unfunded pension obligation	5.4	(12.1)	8.6
Other comprehensive income / (loss)	13.6	(15.6)	12.0
Net comprehensive income / (loss)	$ 120.0	$ 99.4	$ 95.6