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PENSION PLANS AND OTHER BENEFITS - Schedule of Components of Net Periodic Pension Cost (Benefit) (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Interest cost on projected benefit obligation $ 2.2 $ 2.1 $ 1.2
Prior service cost (0.1) (0.1) (0.1)
Expected return on plan assets (2.2) (2.3) (2.0)
Net amortization 1.4 0.3 0.5
Net periodic pension cost (benefit) $ 1.3 $ 0.0 $ (0.4)