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Fair Value Measurements (Fair Value and Redemption Frequency) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Unfunded Commitments
Total Fair Value	10.8	10.3
DP&L [Member]
Total Fair Value	10.8	10.3
Equity Securities [Member]
Unfunded Commitments
Total Fair Value	4.9	4.4
Equity Securities [Member] \| DP&L [Member]
Redemption Frequency	Immediate
Total Fair Value	4.9	4.4
Debt Securities [Member]
Unfunded Commitments
Total Fair Value	5.5	5.5
Debt Securities [Member] \| DP&L [Member]
Redemption Frequency	Immediate
Total Fair Value	5.5	5.5
Money Market Funds [Member]
Unfunded Commitments
Total Fair Value	0.2	0.2
Money Market Funds [Member] \| DP&L [Member]
Redemption Frequency	Immediate
Total Fair Value	0.2	0.2
Hedge Funds, Multi-strategy [Member]
Unfunded Commitments
Total Fair Value	0.2	0.2
Hedge Funds, Multi-strategy [Member] \| DP&L [Member]
Redemption Frequency	Immediate
Total Fair Value	$ 0.2	$ 0.2

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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