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Contractual Obligations, Commercial Commitments And Contingencies (Schedule Of Contractual Obligations And Commercial Commitments) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Contractual Obligations, Commercial Commitments And Contingencies [Line Items]
Total long-term debt	$ 2,614.5	$ 2,628.9
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	902.8	903.0
Long-term debt, Payment Year 2011	0.4
Long-term debt, Payment Year Thereafter	$ 432.4

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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