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EXIT AND DISPOSAL ACTIVITIES - Schedule of Exit and Disposal Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]      
Exit and disposal costs $ 1.0 $ 9.3 $ 10.4
Corporate and shared operations      
Restructuring Cost and Reserve [Line Items]      
Exit and disposal costs 0.3 0.4 0.7
GPC | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Exit and disposal costs 0.1 3.5 3.6
H&G | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Exit and disposal costs 0.0 0.2 0.7
HPC | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Exit and disposal costs $ 0.6 $ 5.2 $ 5.4