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Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
11 Months Ended
Nov. 27, 2011
Dec. 31, 2012
Dec. 31, 2012
DP&L [Member]
Sep. 01, 2011
Senior Notes Maturing in September 2011 - 6.875% [Member]
Interest rate hedging relationships notional amount $ 200.0      
Gain (Loss) on Settlement of Derivative Instrument (Before Tax) 48.1      
Gain (Loss) on Settlement of Derivative Instrument (After Tax) 31.3      
Loans Payable to Bank, Noncurrent 425.0      
Senior notes maturing in September 2011 297.4      
Debt instrument interest percentage 6.875%     6.875%
Reclassified from accumulated OCI into income, forecasted transactions 5.1      
Reclassified from accumulated OCI into income, forecasted transactions, net of tax 3.3      
Fair value of commodity derivative instruments   13.2 11.7  
Liability position offset by the asset position of counterparties with master netting agreements   6.3 6.4  
Collateral Already Posted, Aggregate Fair Value   5.1 3.6  
Collateral if debt were to fall below investment grade   $ 1.8 $ 1.7