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Basis of Presentation and Accounting Policies - Property (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Property, Plant and Equipment [Line Items] |  |  |
Capital expenditures in accounts payable or other current liabilities at year end | $ 56.0 | $ 42.0 | $ 43.0
Supplier finance program, obligation, current | $ 68.0 | $ 77.0 |
Supplier finance program, obligation, current, statement of financial position [Extensible Enumeration] | Accounts Payable, Current |  |
Minimum | Building and Building Improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Minimum | Machinery and Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Minimum | Software Development |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Maximum | Building and Building Improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 40 years |  |
Maximum | Machinery and Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 20 years |  |
Maximum | Software Development |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |

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