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Derivatives (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 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 $ (0.2) $ 0.4 $ (1.7) $ 2.6  
Derivative instruments, gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred         1.9
Forward Contracts [Member]
         
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, notional amount $ 45.7   $ 45.7