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RESTRUCTURING CHARGES - Summary of Costs Incurred and Cumulative Costs by Cost Type (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
Termination Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 8.3 12.0 7.7
Other Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 1.6 $ 47.8 $ 32.6