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INCOME TAXES - Schedule of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]      
United States $ (53.1) $ 8.0 $ (399.8)
Outside the United States 140.3 155.6 109.6
Income (loss) from continuing operations before income taxes $ 87.2 $ 163.6 $ (290.2)