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EXIT AND DISPOSAL ACTIVITIES - Schedule of Exit and Disposal Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]      
Total exit and disposal activities $ 8.8 $ 1.0 $ 9.3
Corporate and shared operations      
Restructuring Cost and Reserve [Line Items]      
Total exit and disposal activities 2.3 0.3 0.4
GPC | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Total exit and disposal activities 0.9 0.1 3.5
H&G | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Total exit and disposal activities 0.0 0.0 0.2
HPC | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Total exit and disposal activities $ 5.6 $ 0.6 $ 5.2