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Financial Instruments (Fair Value and Balance Sheet Location of Derivatives) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Derivative [Line Items] |  |
Total Derivatives, Assets | $ 317.4 | $ 142.6
Total Derivatives, Liabilities | 140.1 | 100.6
Designated as hedging instrument |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 270.3 | 119.6
Total Derivatives, Liabilities | 79.1 | 78.6
Designated as hedging instrument | Other Receivables and Current Assets | Forward exchange contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 98.4 | 74.5
Designated as hedging instrument | Other Receivables and Current Assets | Interest Rate Management Contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 6.8 | 1.2
Designated as hedging instrument | Other Noncurrent Assets | Forward exchange contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 10.3 | 9.6
Designated as hedging instrument | Other Noncurrent Assets | Interest Rate Management Contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 154.8 | 34.3
Designated as hedging instrument | Payables and Accrued Liabilities | Forward exchange contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Liabilities | 44.1 | 21.6
Designated as hedging instrument | Payables and Accrued Liabilities | Interest Rate Management Contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Liabilities | 2.0 | 1.2
Designated as hedging instrument | Other Noncurrent Liabilities | Forward exchange contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Liabilities | 5.6 | 15.6
Designated as hedging instrument | Other Noncurrent Liabilities | Interest Rate Management Contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Liabilities | 27.4 | 40.2
Not designated as hedging instrument |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 47.1 | 23.0
Total Derivatives, Liabilities | 61.0 | 22.0
Not designated as hedging instrument | Other Receivables and Current Assets | Forward exchange contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 22.6 | 16.5
Not designated as hedging instrument | Other Receivables and Current Assets | Interest Rate Management Contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 0.0 | 1.7
Not designated as hedging instrument | Other Noncurrent Assets | Forward exchange contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 8.8 | 0.2
Not designated as hedging instrument | Other Noncurrent Assets | Interest Rate Management Contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Assets | 15.7 | 4.6
Not designated as hedging instrument | Payables and Accrued Liabilities | Forward exchange contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Liabilities | 25.1 | 21.8
Not designated as hedging instrument | Payables and Accrued Liabilities | Interest Rate Management Contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Liabilities | 0.0 | 0.0
Not designated as hedging instrument | Other Noncurrent Liabilities | Forward exchange contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Liabilities | 35.9 | 0.2
Not designated as hedging instrument | Other Noncurrent Liabilities | Interest Rate Management Contracts |  |
Derivative [Line Items] |  |
Total Derivatives, Liabilities | $ 0.0 | $ 0.0

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