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Financial Instruments (Fair Value and Balance Sheet Location of Derivatives) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Derivative [Line Items]    
Total Derivatives, Assets $ 96.0 $ 143.3
Total Derivatives, Liabilities 142.7 85.6
Designated as Hedging Instrument    
Derivative [Line Items]    
Total Derivatives, Assets 76.2 110.9
Total Derivatives, Liabilities 125.6 57.6
Designated as Hedging Instrument | Other Receivables and Current Assets | Forward exchange contracts    
Derivative [Line Items]    
Total Derivatives, Assets 45.4 51.1
Designated as Hedging Instrument | Other Receivables and Current Assets | Interest Rate Management Contracts    
Derivative [Line Items]    
Total Derivatives, Assets 10.3 14.7
Designated as Hedging Instrument | Other Noncurrent Assets | Forward exchange contracts    
Derivative [Line Items]    
Total Derivatives, Assets 2.0 0.8
Designated as Hedging Instrument | Other Noncurrent Assets | Interest Rate Management Contracts    
Derivative [Line Items]    
Total Derivatives, Assets 18.5 44.3
Designated as Hedging Instrument | Accrued Liabilities | Forward exchange contracts    
Derivative [Line Items]    
Total Derivatives, Liabilities 55.5 22.5
Designated as Hedging Instrument | Accrued Liabilities | Interest Rate Management Contracts    
Derivative [Line Items]    
Total Derivatives, Liabilities 6.5 0.4
Designated as Hedging Instrument | Other Noncurrent Liabilities | Forward exchange contracts    
Derivative [Line Items]    
Total Derivatives, Liabilities 37.2 33.0
Designated as Hedging Instrument | Other Noncurrent Liabilities | Interest Rate Management Contracts    
Derivative [Line Items]    
Total Derivatives, Liabilities 26.4 1.7
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Total Derivatives, Assets 19.8 32.4
Total Derivatives, Liabilities 17.1 28.0
Not Designated as Hedging Instrument | Other Receivables and Current Assets | Forward exchange contracts    
Derivative [Line Items]    
Total Derivatives, Assets 19.6 31.7
Not Designated as Hedging Instrument | Other Noncurrent Assets | Forward exchange contracts    
Derivative [Line Items]    
Total Derivatives, Assets 0.1 0.0
Not Designated as Hedging Instrument | Other Noncurrent Assets | Interest Rate Management Contracts    
Derivative [Line Items]    
Total Derivatives, Assets 0.1 0.7
Not Designated as Hedging Instrument | Accrued Liabilities | Forward exchange contracts    
Derivative [Line Items]    
Total Derivatives, Liabilities 17.1 28.0
Not Designated as Hedging Instrument | Other Noncurrent Liabilities | Forward exchange contracts    
Derivative [Line Items]    
Total Derivatives, Liabilities 0.0 0.0
Not Designated as Hedging Instrument | Other Noncurrent Liabilities | Interest Rate Management Contracts    
Derivative [Line Items]    
Total Derivatives, Liabilities $ 0.0 $ 0.0