Property, Plant, and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Land	$ 19.3	$ 18.9
Buildings and Improvements, Gross	153.1	147.9
Machinery and Equipment, Gross	1,178.5	1,132.7
Capitalized Computer Software, Gross	69.0	62.5
Construction in Progress, Gross	77.0	62.0
Property, Plant and Equipment, Gross	1,496.9	1,424.0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,127.6	1,074.9
Property, plant and equipment, net	369.3	349.1
Software amortization	3.9	4.3	$ 5.0
Depreciation	$ 53.8	$ 52.7	$ 55.6

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of expense for amortization of capitalized computer software costs.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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