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Derivative Financial Instruments (Details 2) (Interest rate swaps [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Interest rate swaps [Member]
   
Fair values of derivative instruments    
Cash Flow Hedges, Fair value of derivative assets $ (2.7) [1] $ (4.0) [1]
Fair value of collateral posted $ 4.0  
[1] Presented within Other long-term liabilities.