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Financial Instruments (Currency Price Risk Management Instruments) (Details) - Forward exchange contracts - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Derivative [Line Items]    
US$ Notional $ 5,601.5 $ 4,795.8
Years Average Maturity 9 months 18 days 9 months 18 days
Designated as Hedging Instrument | Cash flow hedges    
Derivative [Line Items]    
US$ Notional $ 4,525.0 $ 3,465.2
Years Average Maturity 8 months 12 days 7 months 6 days
Designated as Hedging Instrument | Net investment hedges    
Derivative [Line Items]    
US$ Notional $ 542.2 $ 638.0
Years Average Maturity 2 years 2 months 12 days 3 years
Not Designated as Hedging Instrument    
Derivative [Line Items]    
US$ Notional $ 534.3 $ 692.6
Years Average Maturity 3 months 18 days 1 month 6 days