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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Accounting Policies [Abstract]      
Interest paid $ 157.7 $ 173.5 $ 112.5
Income taxes paid (refunded), net $ 9.4 $ (18.2) $ 27.2