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Financial Instruments and Risk Management - Balance Sheet Offsetting (Details) (Foreign Exchange Contract [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Other Current Assets [Member]
   
Derivative Asset [Abstract]    
Gross amounts of recognized assets $ 15.5 $ 7.3
Gross amounts offset in the Balance Sheet 0 (0.6)
Net amounts of assets presented in the Balance Sheet 15.5 6.7
Other Current Liabilities [Member]
   
Derivative Liability [Abstract]    
Gross amounts of recognized liabilities 5.5 8.6
Gross amounts offset in the Balance Sheet 0 (0.2)
Net amounts of liabilities presented in the Balance Sheet $ 5.5 $ 8.4