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DERIVATIVES - Summary of Gain (Loss) on Derivatives Not Designated as Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Foreign exchange contracts | Other non-operating expense (income)      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivatives not designated as hedges $ 25.6 $ (3.2) $ (10.8)