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DERIVATIVES - Schedule of Net Investment Hedge (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Net Investment Hedge      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) recognized in other comprehensive income (loss) $ 6.2 $ (33.0) $ 29.8