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Financial Instruments (Carrying Amount and Cumulative Hedging Adjustment) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Sep. 30, 2025
Current portion of long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amounts of hedged item	$ 644.5	$ 549.7
Cumulative hedging adjustment, included in carrying amount	(5.0)	(0.3)
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amounts of hedged item	879.7	1,522.5
Cumulative hedging adjustment, included in carrying amount	$ (17.4)	$ (23.1)

- 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.

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