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Contractual Obligations, Commercial Commitments And Contingencies (Schedule Of Contractual Obligations And Commercial Commitments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Contractual Obligations, Commercial Commitments And Contingencies [Line Items]
Total long-term debt	$ 929.3	$ 934.0
Long-term debt, Payment Year 2011	0.4
Long-term debt, Payment Year Thereafter	1,252.9
DP&L [Member]
Contractual Obligations, Commercial Commitments And Contingencies [Line Items]
Total long-term debt	902.9	903.0
Long-term debt, Payment Year 2011	0.4
Long-term debt, Payment Year Thereafter	$ 432.4

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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