Property, Plant, and Equipment (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Land	$ 19,300,000	$ 18,900,000
Buildings and Improvements, Gross	153,100,000	147,900,000
Machinery and Equipment, Gross	1,178,500,000	1,132,700,000
Capitalized Computer Software, Gross	69,000,000.0	62,500,000
Construction in Progress, Gross	77,000,000.0	62,000,000.0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,127,600,000	1,074,900,000
Property, Plant and Equipment, Gross	1,496,900,000	1,424,000,000
Property, plant and equipment, net	369,300,000	349,100,000
Non-Cash Investing Activity - Acqusition of PP&E	1,000,000.0	5.8
Non-Cash Investing Activity - Acqusition of PP&E	$ 1,000,000.0	$ 5.8