Property, Plant, and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Land	$ 18.9	$ 18.5
Buildings and Improvements, Gross	147.9	142.6
Machinery and Equipment, Gross	1,132.7	1,105.3
Capitalized Computer Software, Gross	62.5	60.2
Construction in Progress, Gross	62.0	38.5
Property, Plant and Equipment, Gross	1,424.0	1,365.1
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,074.9	1,027.2
Property, plant and equipment, net	349.1	337.9
Software amortization	4.3	5.0	$ 4.7
Depreciation	$ 52.7	$ 55.6	$ 55.7