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LEASES - Cash Flow Activity for Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
Operating cash flow from operating leases $ 20.7 $ 16.1
Operating cash flows from finance leases 5.4 5.7
Financing cash flows from finance leases 12.0 10.6
Supplemental non-cash flow disclosure    
Acquisition of operating lease asset through lease obligations $ 15.3 $ 23.6