Financial Instruments and Risk Management (Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Sep. 30, 2025 |
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| Derivative [Line Items] | ||
| Total long-term debt, including current maturities | $ 1,250.0 | $ 1,390.0 |
| Fixed rate debt | ||
| Derivative [Line Items] | ||
| Total long-term debt, including current maturities | 1,250.0 | 1,250.0 |
| Level 2 | Recurring fair value measurement | ||
| Derivative [Line Items] | ||
| Deferred compensation | (21.2) | (20.7) |
| Net liabilities at estimated fair value | (17.1) | (22.1) |
| Level 2 | Recurring fair value measurement | FX contract | ||
| Derivative [Line Items] | ||
| Estimated fair value of derivatives | $ 4.1 | $ (1.4) |
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- Definition Assets (Liabilities), at Fair Value, Net No definition available.
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- Definition Deferred Compensation Asset (Liability), at Fair Value, Net No definition available.
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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