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Derivative Instruments and Fair Value Measurment (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Derivative Instruments and Fair Value Measurement (Textual) [Abstract]        
Notional values of forward exchange contracts $ 1,011.1      
Notional values of forward exchange contracts designated as cash flow hedges 586.7      
Foreign denominated debt designated as net investment hedges 14.7      
Net unrealized gains (losses) on cash flow hedges to be reclassified into earnings during the next 12 months (0.4)      
Net unrealized gains (losses) on cash flow hedges to be reclassified into earnings during the next 12 months, net of tax (0.1)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 954.3 903.9 884.0 988.9
Cash and Cash Equivalents, Fair Value Disclosure 954.3 903.9    
Investments, Fair Value Disclosure 350.0 350.0    
Short-term Investments 350.0 350.0    
Short-term debt 253.0 157.0    
Short-term Debt, Fair Value 253.0 157.0    
Long-term debt, Carrying Value 905.0 905.0    
Long-term debt, Fair Value 1,181.7 1,187.9    
Fair Value, Inputs, Level 1 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 846.3 779.4    
Investments, Fair Value Disclosure 0 0    
Short-term Debt, Fair Value 0 0    
Long-term debt, Fair Value 0 0    
Fair Value, Inputs, Level 2 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 108.0 124.5    
Investments, Fair Value Disclosure 350.0 350.0    
Short-term Debt, Fair Value 253.0 157.0    
Long-term debt, Fair Value 1,181.7 1,187.9    
Fair Value, Inputs, Level 3 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 0    
Investments, Fair Value Disclosure 0 0    
Short-term Debt, Fair Value 0 0    
Long-term debt, Fair Value $ 0 $ 0