Income Taxes (Tax or Benefit credited to AOCI) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	11 Months Ended	12 Months Ended
Dec. 31, 2011	Nov. 27, 2011	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2012 DP&L [Member]	Dec. 31, 2011 DP&L [Member]	Dec. 31, 2010 DP&L [Member]
Other Tax Expense (Benefit)	$ (1.2)	$ (33.2)	$ (2.5)	$ 5.8	$ (0.8)	$ (7.2)	$ 0.1

- Definition

The component of income tax expense representing amounts paid or payable (or refundable) which are classified as "income taxes" as determined by applying the provisions of enacted tax law to other than the taxable Income or Loss from continuing operations for the period. Items affecting income taxes and required to be disclosed, but not included elsewhere, would also be designated as "Other".

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