Financial Instruments (Fair Value and Balance Sheet Location of Derivatives) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Total Derivatives, Assets	$ 189.1	$ 83.4
Total Derivatives, Liabilities	$ 366.5	$ 121.5
Other receivables and current assets
Derivative [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current	Other Assets, Current
Other noncurrent assets
Derivative [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other noncurrent assets	Other noncurrent assets
Payables and accrued liabilities
Derivative [Line Items]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current
Other noncurrent liabilities
Derivative [Line Items]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other noncurrent liabilities	Other noncurrent liabilities
Designated as Hedging Instrument
Derivative [Line Items]
Total Derivatives, Assets	$ 181.6	$ 74.7
Total Derivatives, Liabilities	364.3	115.1
Not Designated as Hedging Instrument
Derivative [Line Items]
Total Derivatives, Assets	7.5	8.7
Total Derivatives, Liabilities	2.2	6.4
Forward exchange contracts | Designated as Hedging Instrument | Other receivables and current assets
Derivative [Line Items]
Total Derivatives, Assets	71.6	35.1
Forward exchange contracts | Designated as Hedging Instrument | Other noncurrent assets
Derivative [Line Items]
Total Derivatives, Assets	60.8	5.5
Forward exchange contracts | Designated as Hedging Instrument | Payables and accrued liabilities
Derivative [Line Items]
Total Derivatives, Liabilities	226.2	57.2
Forward exchange contracts | Designated as Hedging Instrument | Other noncurrent liabilities
Derivative [Line Items]
Total Derivatives, Liabilities	46.9	25.2
Forward exchange contracts | Not Designated as Hedging Instrument | Other receivables and current assets
Derivative [Line Items]
Total Derivatives, Assets	6.1	8.7
Forward exchange contracts | Not Designated as Hedging Instrument | Other noncurrent assets
Derivative [Line Items]
Total Derivatives, Assets	0.1	0.0
Forward exchange contracts | Not Designated as Hedging Instrument | Payables and accrued liabilities
Derivative [Line Items]
Total Derivatives, Liabilities	2.1	6.4
Forward exchange contracts | Not Designated as Hedging Instrument | Other noncurrent liabilities
Derivative [Line Items]
Total Derivatives, Liabilities	0.1	0.0
Interest rate management contracts | Designated as Hedging Instrument | Other receivables and current assets
Derivative [Line Items]
Total Derivatives, Assets	36.7	16.0
Interest rate management contracts | Designated as Hedging Instrument | Other noncurrent assets
Derivative [Line Items]
Total Derivatives, Assets	12.5	18.1
Interest rate management contracts | Designated as Hedging Instrument | Payables and accrued liabilities
Derivative [Line Items]
Total Derivatives, Liabilities	0.0	5.2
Interest rate management contracts | Designated as Hedging Instrument | Other noncurrent liabilities
Derivative [Line Items]
Total Derivatives, Liabilities	91.2	27.5
Interest rate management contracts | Not Designated as Hedging Instrument | Other noncurrent assets
Derivative [Line Items]
Total Derivatives, Assets	1.3	0.0
Interest rate management contracts | Not Designated as Hedging Instrument | Other noncurrent liabilities
Derivative [Line Items]
Total Derivatives, Liabilities	$ 0.0	$ 0.0