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Overview and Summary of Significant Accounting Policies (Changes in the Liability for Generation AROs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended	12 Months Ended	11 Months Ended
	Dec. 31, 2012 DP&L [Member]	Dec. 31, 2011 DP&L [Member]	Dec. 31, 2011 Successor [Member]	Dec. 31, 2012 Successor [Member]	Nov. 27, 2011 Predecessor [Member]
Balance at January 1	$ 18.8	$ 17.5		$ 23.6	$ 17.5
Accretion expense	0.9	0.8		0.8	0.8
Settlements	(0.4)	(0.5)	(0.1)	(0.4)	(0.4)
Estimated cash flow revisions	(0.1)	1.0	0.1	(0.1)	0.9
Balance at December 31	$ 19.2	$ 18.8	$ 23.6	$ 23.9	$ 18.8

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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