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Derivatives (Details) (Cost of Sales [Member], Cash Flow Hedging [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cost of Sales [Member] | Cash Flow Hedging [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Income Statement Location of Gain (Loss) Reclassified from Accumulated OCI   Cost of Goods Sold  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   $ 1.9 $ 0.8
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred $ (5.5)