Financial Instruments (Fair Value and Balance Sheet Location of Derivatives) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Total Derivatives, Assets	$ 137.6	$ 83.4
Total Derivatives, Liabilities	215.1	121.5
Designated as Hedging Instrument
Derivative [Line Items]
Total Derivatives, Assets	132.0	74.7
Total Derivatives, Liabilities	211.6	115.1
Designated as Hedging Instrument | Other Receivables and Current Assets | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Assets	55.2	35.1
Designated as Hedging Instrument | Other Receivables and Current Assets | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Assets	20.9	16.0
Designated as Hedging Instrument | Other Noncurrent Assets | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Assets	26.3	5.5
Designated as Hedging Instrument | Other Noncurrent Assets | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Assets	29.6	18.1
Designated as Hedging Instrument | Accrued Liabilities | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Liabilities	117.8	57.2
Designated as Hedging Instrument | Accrued Liabilities | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	7.8	5.2
Designated as Hedging Instrument | Other Noncurrent Liabilities | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Liabilities	12.3	25.2
Designated as Hedging Instrument | Other Noncurrent Liabilities | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	73.7	27.5
Not Designated as Hedging Instrument
Derivative [Line Items]
Total Derivatives, Assets	5.6	8.7
Total Derivatives, Liabilities	3.5	6.4
Not Designated as Hedging Instrument | Other Receivables and Current Assets | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Assets	5.6	8.7
Not Designated as Hedging Instrument | Accrued Liabilities | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Liabilities	$ 3.5	$ 6.4