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Financial Instruments (Currency Price Risk Management Instruments) (Details) - Forward Exchange Contracts - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Derivative [Line Items]    
US$ Notional $ 6,089.8 $ 4,302.5
Years Average Maturity 9 months 18 days 7 months 6 days
Designated as Hedging Instrument | Cash Flow Hedges    
Derivative [Line Items]    
US$ Notional $ 3,699.9 $ 2,418.2
Years Average Maturity 4 months 24 days 6 months
Designated as Hedging Instrument | Net Investment Hedges    
Derivative [Line Items]    
US$ Notional $ 615.6 $ 830.8
Years Average Maturity 3 years 10 months 24 days 10 months 24 days
Not Designated as Hedging Instrument    
Derivative [Line Items]    
US$ Notional $ 1,774.3 $ 1,053.5
Years Average Maturity 4 months 24 days 7 months 6 days