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Derivatives (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2013
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 $ (1.3) $ 1.5 $ (1.5) $ 2.2  
Derivative instruments, gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred         (0.1)
Forward Contracts [Member]
          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount $ 54.8   $ 54.8