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PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 641.4 $ 590.5
Accumulated depreciation (381.2) (334.9)
Property, plant and equipment, net 260.2 255.6
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 83.5 80.2
Machinery, equipment and other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 383.0 344.4
Finance leases    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 146.1 145.4
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 28.8 $ 20.5