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Financial Assets and Financial Liabilities Measured at Fair Value (Details 2) (Measured on a recurring basis, (Level 2), Interest-rate swap, USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Measured on a recurring basis | (Level 2) | Interest-rate swap
   
Fair values for derivatives    
Derivative Liability $ (20.2)  
Derivative Asset   $ 17.0