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, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Interest Cost	$ 2.1	$ 2.2	$ 2.1
Prior service cost	(0.1)	(0.1)	(0.1)
Expected return on plan assets	(2.2)	(2.2)	(2.3)
Net amortization	1.1	1.4	0.3
Net periodic pension cost	$ 0.9	$ 1.3	$ 0.0