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INCOME TAXES - Schedule of Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Current tax expense      
U.S. Federal $ 10.9 $ 27.4 $ 81.8
Foreign 34.2 31.9 44.9
State and local 1.1 1.3 (0.4)
Total current tax expense 46.2 60.6 126.3
Deferred tax (benefit) expense      
U.S. Federal (20.5) 6.2 (197.7)
Foreign (26.4) 1.2 5.0
State and local (12.3) (3.7) 9.9
Total deferred tax (benefit) expense (59.2) 3.7 (182.8)
Income tax (benefit) expense $ (13.0) $ 64.3 $ (56.5)