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Derivative Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair values of derivative instruments    
Cash Flow Hedges, Fair value of derivative assets $ (4.0) $ (2.9)
Expense recognized 1.2  
Notional amount 150.0  
Interest rate swaps
   
Fair values of derivative instruments    
Cash Flow Hedges, Fair value of derivative assets $ (4.0) $ (2.9)