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Financial Instruments (Currency Price Risk Management Instruments) (Details) - Forward exchange contracts - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Derivative [Line Items] |  |
US$ Notional | $ 6,107.8 | $ 6,794.6
Years Average Maturity | 1 year | 9 months 18 days
Designated as hedging instrument | Cash flow hedges |  |
Derivative [Line Items] |  |
US$ Notional | $ 3,110.7 | $ 4,003.2
Years Average Maturity | 7 months 6 days | 7 months 6 days
Designated as hedging instrument | Net investment hedges |  |
Derivative [Line Items] |  |
US$ Notional | $ 160.9 | $ 911.4
Years Average Maturity | 1 month 6 days | 2 years 6 months
Not designated as hedging instrument |  |
Derivative [Line Items] |  |
US$ Notional | $ 2,836.2 | $ 1,880.0
Years Average Maturity | 1 year 4 months 24 days | 3 months 18 days

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
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