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RELATED PARTIES - Summary of Transaction Service Agreements (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
TSA income      
Related Party Transaction [Line Items]      
Related party costs $ 0.9 $ 9.6 $ 19.1
TSA expense      
Related Party Transaction [Line Items]      
Related party costs 2.6 13.5 13.9
Net TSA (loss) income      
Related Party Transaction [Line Items]      
Net TSA (loss) income $ (1.7) $ (3.9) $ 5.2