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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 789.0 $ 779.1
Less: accumulated depreciation (526.3) (488.7)
Total Property, Plant and Equipment, Net 262.7 290.4
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 3.1 3.1
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 121.6 121.7
Machinery, equipment and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 593.5 607.3
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 12.9 11.9
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 57.9 $ 35.1