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Fair Value Measurements (Schedule of the Carrying Values and Fair Values of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2012
Carrying Value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, including current portion carrying value $ 5,105.6 $ 5,563.7 $ 4,658.5
Fair Value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, including current portion fair value 5,302.8 5,804.1 5,005.9
Interest rate management contract [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative assets 49.3 35.4  
Derivative liabilities 7.8 9.6  
Interest rate management contract [Member] | Carrying Value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative assets 49.3 35.4 49.7
Derivative liabilities 7.8 9.6 25.1
Interest rate management contract [Member] | Fair Value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative assets 49.3 35.4 49.7
Derivative liabilities 7.8 9.6 25.1
Forward Exchange Contracts [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative assets 68.0 90.5  
Derivative liabilities 54.6 31.7  
Forward Exchange Contracts [Member] | Carrying Value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative assets 68.0 90.5 77.9
Derivative liabilities 54.6 31.7 21.7
Forward Exchange Contracts [Member] | Fair Value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative assets 68.0 90.5 77.9
Derivative liabilities $ 54.6 $ 31.7 $ 21.7