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Financial Instruments (Interest Rate Management Contracts and Cross Currency Interest Rate Swaps) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Interest Rate Swaps Contracts | Designated as hedging instrument | Fair Value Hedges |  |
Derivative [Line Items] |  |
US$ Notional | $ 800.0 | $ 800.0
Average Pay % | Secured Overnight Financing Rate (SOFR) [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Average Receive % | 1.64% | 1.64%
Years Average Maturity | 2 years 2 months 12 days | 3 years
Interest Rate Swaps Contracts | Designated as hedging instrument | Cash flow hedges |  |
Derivative [Line Items] |  |
US$ Notional | $ 2,963.2 | $ 2,159.3
Average Pay % | 2.77% | 2.72%
Average Receive % | SOFR | SOFR
Years Average Maturity | 20 years 6 months | 21 years 2 months 12 days
Interest Rate Swaps Contracts | Not designated as hedging instrument |  |
Derivative [Line Items] |  |
US$ Notional | $ 347.5 | $ 461.4
Average Pay % | 3.26% | 3.27%
Average Receive % | SOFR | SOFR
Years Average Maturity | 19 years 2 months 12 days | 20 years 6 months
Cross currency interest rate swaps | Designated as hedging instrument | Net investment hedges |  |
Derivative [Line Items] |  |
US$ Notional | $ 0.0 | $ 16.7
Average Pay % | 0.00% | 5.39%
Average Receive % | 0.00% | 3.64%
Years Average Maturity | 0 years | 2 months 12 days
Cross currency interest rate swaps | Designated as hedging instrument | Cash flow hedges |  |
Derivative [Line Items] |  |
US$ Notional | $ 308.4 | $ 410.6
Average Pay % | 5.12% | 4.96%
Average Receive % | 3.01% | 2.80%
Years Average Maturity | 1 year 7 months 6 days | 1 year 10 months 24 days
Cross currency interest rate swaps | Not designated as hedging instrument |  |
Derivative [Line Items] |  |
US$ Notional | $ 0.0 | $ 34.7
Average Pay % | 0.00% | 5.39%
Average Receive % | 0.00% | 3.64%
Years Average Maturity | 0 years | 2 months 12 days

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- Definition Average receive interest rate related to group of interest rate derivatives. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the interest rate derivative and the maturity of the reference rate used. + References No definition available. + Details
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- Definition Indicates type of variable interest rate on debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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