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Supplemental Information (Debt) (Narrative) (Details)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2014
Eurobond 3.875% [Member]
USD ($)
Mar. 31, 2014
Eurobond 3.875% [Member]
EUR (€)
Mar. 31, 2014
Commercial Paper [Member]
USD ($)
Mar. 31, 2014
Revolving Credit Facility [Member]
2013 Credit Agreement [Member]
USD ($)
Line Of Credit Facility [Line Items]        
Maximum borrowing capacity       $ 2,500.0
Expiration date       Apr. 30, 2018
Debt Instrument [Line Items]        
Amount classified as long-term debt based on ability and intent to refinance $ 413.0 € 300.0 $ 400.0  
Interest rate of debt, stated percentage 3.875% 3.875%    
Maturity, month and year March 2015 March 2015