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INCOME TAXES - Domestic and Foreign Components of Income From Continuing Operations Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
Domestic $ (376.2) $ (427.3) $ 670.2
Foreign (77.1) (130.8) 6.9
Income (loss) from continuing operations before income taxes $ (453.3) $ (558.1) $ 677.1