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Property, Plant and Equipment - Components of Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 774.7 $ 891.7
Less: accumulated depreciation (419.0) (440.7)
Total Property, Plant and Equipment, Net 355.7 451.0
Land    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1.6 3.6
Buildings    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 98.2 120.4
Machinery, equipment and fixtures    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 522.7 570.8
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6.5 6.1
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 145.7 $ 190.8