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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
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 non-operating expense (income), net Other non-operating expense (income), net Other non-operating expense (income), net
U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0.6 $ 0.5 $ 0.5
Interest cost 2.8 1.9 1.8
Expected return on assets (3.1) (3.2) (3.7)
Recognized net actuarial loss 0.0 0.8 1.4
Net periodic benefit cost $ 0.3 $ 0.0 $ 0.0
Weighted average assumptions      
Discount rate 5.37% 2.70% 2.46%
Expected return on plan assets 5.25% 5.00% 6.00%
Non U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0.8 $ 1.2 $ 1.5
Interest cost 4.6 2.1 2.1
Expected return on assets (3.9) (4.0) (4.0)
Recognized net actuarial loss 0.8 2.8 3.4
Net periodic benefit cost $ 2.3 $ 2.1 $ 3.0
Weighted average assumptions      
Rate of compensation increase 2.75% 2.50%  
Non U.S. Plans | Minimum      
Weighted average assumptions      
Discount rate 3.70% 1.00% 0.70%
Expected return on plan assets 2.54% 0.99% 0.70%
Non U.S. Plans | Maximum      
Weighted average assumptions      
Discount rate 5.20% 2.00% 1.75%
Expected return on plan assets 5.58% 4.06% 3.40%
Rate of compensation increase     2.25%