EMPLOYEE BENEFIT PLANS - Schedule of Components of Net Periodic Benefit Cost (Details) - 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]
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.7	$ 0.6	$ 0.5
Interest cost	2.8	2.8	1.9
Expected return on assets	(2.9)	(3.1)	(3.2)
Unrecognized prior service cost	0.0	0.0	0.0
Recognized net actuarial loss	0.0	0.0	0.8
Net periodic benefit cost	$ 0.6	$ 0.3	$ 0.0
Weighted average assumptions
Discount rate		5.37%	2.70%
Expected return on plan assets	5.50%	5.25%	5.00%
U.S. Plans | Minimum
Weighted average assumptions
Discount rate	556.00%
U.S. Plans | Maximum
Weighted average assumptions
Discount rate	5.72%
Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.7	$ 0.8	$ 1.2
Interest cost	5.0	4.6	2.1
Expected return on assets	(4.5)	(3.9)	(4.0)
Unrecognized prior service cost	0.1	0.0	0.0
Recognized net actuarial loss	0.9	0.8	2.8
Net periodic benefit cost	$ 2.2	$ 2.3	$ 2.1
Weighted average assumptions
Rate of compensation increase	275.00%	2.75%
Non U.S. Plans | Minimum
Weighted average assumptions
Discount rate	4.00%	3.70%	1.00%
Expected return on plan assets	2.54%	2.54%	0.99%
Non U.S. Plans | Maximum
Weighted average assumptions
Discount rate	5.60%	5.20%	2.00%
Expected return on plan assets	5.00%	5.58%	4.06%
Rate of compensation increase			2.50%