Document and Entity Information	3 Months Ended
	Mar. 31, 2015
Entity Registrant Name	DPL INC
Entity Central Index Key	0000787250
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Voluntary Filers	Yes
Entity Well-known Seasoned Issuer	No
DPL [Member]
Entity Common Stock, Shares Outstanding	1
THE DAYTON POWER AND LIGHT COMPANY [Member]
Entity Common Stock, Shares Outstanding	41,172,173