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Financial Instruments (Schedule of Outstanding Currency Price Risk Management Instruments) (Details) (Forward Exchange Contracts [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Derivative [Line Items]    
US$ Notional $ 4,637.1 $ 2,605.7
Years Average Maturity 12 months 12 months
Cash Flow Hedges [Member]
   
Derivative [Line Items]    
US$ Notional 2,653.4 1,348.8
Years Average Maturity 7 months 7 months
Net Investment Hedges [Member]
   
Derivative [Line Items]    
US$ Notional 1,231.8 779.2
Years Average Maturity 2 years 5 months 2 years 6 months
Hedges Not Designated [Member]
   
Derivative [Line Items]    
US$ Notional $ 751.9 $ 477.7
Years Average Maturity 1 month 1 month