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Derivative Financial Instruments and Hedging Activities (Details 3) (USD $)
In Millions
12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Pre-tax gains (losses) on derivative instruments   
Total pre-tax effects of derivative instruments$ (14.6)$ (39.1) 
Interest rate contracts | Cash flow hedges | Interest expense
   
Pre-tax gains (losses) on derivative instruments   
Reclassified from other comprehensive income (effective portion):(16.6)(40.7) 
Foreign exchange contracts | Cash flow hedges | Cost of Sales
   
Pre-tax gains (losses) on derivative instruments   
Reclassified from other comprehensive income (effective portion): (0.3) 
Interest rate contracts
   
Pre-tax gains (losses) on derivative instruments   
Reclassified from other comprehensive income (effective portion):16.6(41.6)(48.3)
Interest rate contracts | Interest expense
   
Pre-tax gains (losses) on derivative instruments   
Not designated as hedges (0.9) 
Foreign exchange contracts | Miscellaneous, net
   
Pre-tax gains (losses) on derivative instruments   
Not designated as hedges$ 2.0$ 2.8