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Derivative Instruments and Hedging Activities (Fair Values of Derivative Instruments Designated as Hedging Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Sep. 30, 2013
DP&L [Member]
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Short-term Derivative Positions [Member]
Other Prepayments and Current Assets [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Short-term Derivative Positions [Member]
Other Prepayments and Current Assets [Member]
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Short-term Derivative Positions [Member]
Other Prepayments and Current Assets [Member]
DP&L [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Short-term Derivative Positions [Member]
Other Prepayments and Current Assets [Member]
DP&L [Member]
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Short-term Derivative Positions [Member]
Other Current Liabilities [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Short-term Derivative Positions [Member]
Other Current Liabilities [Member]
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Short-term Derivative Positions [Member]
Other Current Liabilities [Member]
DP&L [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Short-term Derivative Positions [Member]
Other Current Liabilities [Member]
DP&L [Member]
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Long-term Derivative Positions [Member]
Other Deferred Credit [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Long-term Derivative Positions [Member]
Other Deferred Credit [Member]
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Long-term Derivative Positions [Member]
Other Deferred Credit [Member]
DP&L [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Long-term Derivative Positions [Member]
Other Deferred Credit [Member]
DP&L [Member]
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Long-term Derivative Positions [Member]
Other Deferred Asset [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Long-term Derivative Positions [Member]
Other Deferred Asset [Member]
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Long-term Derivative Positions [Member]
Other Deferred Asset [Member]
DP&L [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contract Power [Member]
Long-term Derivative Positions [Member]
Other Deferred Asset [Member]
DP&L [Member]
Derivative Asset, Fair Value     $ 12.1 $ 4.9 $ 12.3 $ 4.9                 $ 3.6 $ 5.0 $ 3.8 $ 5.0
Derivative Liability, Fair Value (33.3) (33.6)         (16.7) (6.6) (16.7) (6.6) (2.5) (1.3) (2.8) (1.3)        
Derivative, Fair Value, Net     2.0 0.7 2.2 0.7 1.4 0.1 1.5 0.1     0.2   1.3 4.7 1.5 4.7
Derivative, Collateral, net             (5.2) (2.3) (5.1) (2.3) (0.2) (1.0) (0.3) (1.0)        
Derivative, Fair Value, Offset, Net     $ (10.1) $ (4.2) $ (10.1) $ (4.2) $ (10.1) $ (4.2) $ (10.1) $ (4.2) $ (2.3) $ (0.3) $ (2.3) $ (0.3) $ (2.3) $ (0.3) $ (2.3) $ (0.3)