Financial Instruments (Fair Value and Balance Sheet Location of Derivatives) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Derivative [Line Items]
Total Derivatives, Assets	$ 85.1	$ 83.4
Total Derivatives, Liabilities	127.8	121.5
Designated as Hedging Instrument
Derivative [Line Items]
Total Derivatives, Assets	82.8	74.7
Total Derivatives, Liabilities	126.2	115.1
Designated as Hedging Instrument | Other Receivables and Current Assets | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Assets	40.4	35.1
Designated as Hedging Instrument | Other Receivables and Current Assets | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Assets	16.5	16.0
Designated as Hedging Instrument | Other Noncurrent Assets | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Assets	4.7	5.5
Designated as Hedging Instrument | Other Noncurrent Assets | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Assets	21.2	18.1
Designated as Hedging Instrument | Accrued Liabilities | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Liabilities	52.0	57.2
Designated as Hedging Instrument | Accrued Liabilities | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	8.6	5.2
Designated as Hedging Instrument | Other Noncurrent Liabilities | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Liabilities	18.2	25.2
Designated as Hedging Instrument | Other Noncurrent Liabilities | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	47.4	27.5
Not Designated as Hedging Instrument
Derivative [Line Items]
Total Derivatives, Assets	2.3	8.7
Total Derivatives, Liabilities	1.6	6.4
Not Designated as Hedging Instrument | Other Receivables and Current Assets | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Assets	2.3	8.7
Not Designated as Hedging Instrument | Accrued Liabilities | Forward exchange contracts
Derivative [Line Items]
Total Derivatives, Liabilities	$ 1.6	$ 6.4