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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]      
Interest paid $ 61.6 $ 75.9 $ 93.5
Income taxes paid $ 179.7 $ 124.2 $ 166.2