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Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]    
Total Derivatives, Assets $ 227.8 $ 373.7
Total Derivatives, Liabilities 131.9 95.3
Designated as Hedging Instrument    
Derivative [Line Items]    
Total Derivatives, Assets 222.5 296.6
Total Derivatives, Liabilities 128.7 65.1
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Total Derivatives, Assets 5.3 77.1
Total Derivatives, Liabilities 3.2 30.2
Forward Exchange Contracts | Designated as Hedging Instrument | Other Receivables    
Derivative [Line Items]    
Total Derivatives, Assets 81.7 72.3
Forward Exchange Contracts | Designated as Hedging Instrument | Other Noncurrent Assets    
Derivative [Line Items]    
Total Derivatives, Assets 27.1 44.4
Forward Exchange Contracts | Designated as Hedging Instrument | Accrued Liabilities    
Derivative [Line Items]    
Total Derivatives, Liabilities 82.0 44.0
Forward Exchange Contracts | Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivative [Line Items]    
Total Derivatives, Liabilities 13.8 9.1
Forward Exchange Contracts | Not Designated as Hedging Instrument | Other Receivables    
Derivative [Line Items]    
Total Derivatives, Assets 1.1 77.1
Forward Exchange Contracts | Not Designated as Hedging Instrument | Accrued Liabilities    
Derivative [Line Items]    
Total Derivatives, Liabilities 2.2 29.5
Interest Rate Management Contract | Designated as Hedging Instrument | Other Receivables    
Derivative [Line Items]    
Total Derivatives, Assets 11.1 19.9
Interest Rate Management Contract | Designated as Hedging Instrument | Other Noncurrent Assets    
Derivative [Line Items]    
Total Derivatives, Assets 102.6 160.0
Interest Rate Management Contract | Designated as Hedging Instrument | Accrued Liabilities    
Derivative [Line Items]    
Total Derivatives, Liabilities 10.7 0.0
Interest Rate Management Contract | Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivative [Line Items]    
Total Derivatives, Liabilities 22.2 12.0
Interest Rate Management Contract | Not Designated as Hedging Instrument | Other Receivables    
Derivative [Line Items]    
Total Derivatives, Assets 0.0 0.0
Interest Rate Management Contract | Not Designated as Hedging Instrument | Other Noncurrent Assets    
Derivative [Line Items]    
Total Derivatives, Assets 4.2 0.0
Interest Rate Management Contract | Not Designated as Hedging Instrument | Accrued Liabilities    
Derivative [Line Items]    
Total Derivatives, Liabilities 1.0 0.0
Interest Rate Management Contract | Not Designated as Hedging Instrument | Other Noncurrent Liabilities    
Derivative [Line Items]    
Total Derivatives, Liabilities $ 0.0 $ 0.7