Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 42.1	$ 16.9
Derivative activity:
Change in derivative fair value, net of income tax	(0.3)	0.9
Reclassification of earnings, net of income tax	(0.2)	(0.4)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives Related to Discontinued Operations, Net of Tax	0.0	2.7
Total change in fair value of derivatives	(0.5)	3.2
Pension and postretirement activity:
Reclassification to earnings, net of income tax	0.1	0.1
Total change in unfunded pension obligation	0.1	0.1
Other comprehensive income / (loss)	(0.4)
Net comprehensive income / (loss)	41.7	20.2
THE DAYTON POWER AND LIGHT COMPANY [Member]
Net income	29.0	15.7
Derivative activity:
Change in derivative fair value, net of income tax	(0.2)	0.5
Reclassification of earnings, net of income tax	(0.1)	(0.3)
Total change in fair value of derivatives	(0.3)	0.2
Pension and postretirement activity:
Reclassification to earnings, net of income tax	0.7	0.9
Total change in unfunded pension obligation	0.7	0.9
Other comprehensive income / (loss)	0.4	1.1
Net comprehensive income / (loss)	$ 29.4	$ 16.8