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RECEIVABLES - Schedule of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 5.3 $ 3.5 $ 3.0
Charged to Profit & Loss 1.9 2.3 1.3
Deductions (0.4) (0.5) (1.6)
Other Adjustments (0.1) 0.0 0.8
Ending Balance $ 6.7 $ 5.3 $ 3.5