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Fair Value Measurements (Schedule of the Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including current portion carrying value $ 4,275.1 $ 4,361.6
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including current portion carrying value 4,275.1 4,361.6
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including current portion fair value 4,474.0 4,640.5
Interest rate management contract [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 179.9 171.8
Derivative liabilities 12.7 0.8
Interest rate management contract [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 179.9 171.8
Derivative liabilities 12.7 0.8
Forward Exchange Contracts [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 193.8 146.7
Derivative liabilities 82.6 123.5
Forward Exchange Contracts [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 193.8 146.7
Derivative liabilities $ 82.6 $ 123.5