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RESTRUCTURING CHARGES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 9.9 $ 59.8 $ 40.3
Fiscal 2023 restructuring      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 7.4 0.0 0.0
Tristar      
Restructuring Cost and Reserve [Line Items]      
Costs incurred to-date   10.2  
Russia dissolution      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.8 0.6 0.0
Costs incurred to-date   1.4  
GPC distribution center transition      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.0 30.4 11.5
Costs incurred to-date   41.9  
Global productivity improvement program      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 0.0 5.1 $ 21.2
Costs incurred to-date   $ 157.3