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Derivative Instruments and Fair Value Measurments (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Short-term investments $ 350.0 $ 0    
Cash and Cash Equivalents, at Carrying Value 903.9 988.9 813.4 643.8
Cash and Cash Equivalents, Fair Value Disclosure 903.9      
Investments, Fair Value Disclosure 350.0      
Short-term debt 157.0 0    
Short-term Debt, Fair Value 157.0      
Long-term Debt, Carrying Value 905.0 905.0    
Long-term Debt, Fair Value 1,187.9 1,125.4    
Derivative Instruments and Fair Value Measurement (Textuals) [Abstract]        
Notional values of forward exchange contracts 994.6      
Notional values of forward exchange contracts designated as cash flow hedges 614.6      
Foreign denominated debt designated as net investment hedges 14.6 14.1    
Net unrealized gains (losses) on cash flow hedges to be reclassified into earnings during the next 12 months 0.3      
Net unrealized gains (losses) on cash flow hedges to be reclassified into earnings during the next 12 months, net of tax 0.2      
Fair Value, Inputs, Level 3 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0      
Investments, Fair Value Disclosure 0      
Short-term Debt, Fair Value 0      
Long-term Debt, Fair Value 0      
Fair Value, Inputs, Level 1 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 779.4      
Investments, Fair Value Disclosure 0      
Short-term Debt, Fair Value 0      
Long-term Debt, Fair Value 0      
Fair Value, Inputs, Level 2 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 124.5      
Investments, Fair Value Disclosure 350.0      
Short-term Debt, Fair Value 157.0      
Long-term Debt, Fair Value $ 1,187.9