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PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 704.7 $ 664.3
Accumulated depreciation (429.6) (400.5)
Property, plant and equipment, net 275.1 263.8
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 83.4 75.7
Machinery, tooling and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 330.1 312.4
Computer software    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 136.2 81.7
Finance leases    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 136.9 139.8
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 18.1 $ 54.7