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EMPLOYEE BENEFIT PLANS - Additional Information on Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Changes in benefit obligation:      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income (Expense), Net Interest Income (Expense), Net  
Changes in plan assets:      
Fair value of plan assets, beginning of year $ 217.0    
Fair value of plan assets, end of year 143.4 $ 217.0  
Amounts recognized in statement of financial position      
Deferred charges and other 38.7 38.8  
Other long-term liabilities 57.8 99.0  
Accumulated other comprehensive loss $ (303.1) (235.3)  
Weighted average assumptions      
Defined Benefit Plan, Type [Extensible Enumeration] Pension Plan [Member]    
U.S. Plans      
Changes in benefit obligation:      
Benefit obligation, beginning of year $ 71.4 76.0  
Obligations assumed from acquisition 0.0 0.0  
Service cost 0.5 0.5 $ 0.7
Interest cost 1.9 1.8 2.2
Actuarial (gain) loss (16.1) (2.6)  
Plan Amendments 0.0 0.0  
Benefits paid (4.2) (4.3)  
Foreign currency exchange rate changes 0.0 0.0  
Benefit obligation, end of year 53.5 71.4 76.0
Changes in plan assets:      
Fair value of plan assets, beginning of year 69.6 64.6  
Assets assumed from acquisition 0.0 0.0  
Actual return on plan assets (15.2) 9.0  
Employer contributions 0.1 0.3  
Benefits paid (4.2) (4.3)  
Foreign currency exchange rate changes 0.0 0.0  
Fair value of plan assets, end of year 50.3 69.6 64.6
Funded Status (3.2) (1.8)  
Amounts recognized in statement of financial position      
Deferred charges and other 0.0 0.0  
Other accrued expenses 0.1 0.1  
Other long-term liabilities 3.1 1.7  
Accumulated other comprehensive loss $ 10.9 $ 9.4  
Weighted average assumptions      
Discount rate 5.37% 2.70%  
Non U.S. Plans      
Changes in benefit obligation:      
Benefit obligation, beginning of year $ 176.1 $ 158.7  
Obligations assumed from acquisition 0.0 19.0  
Service cost 1.2 1.5 1.7
Interest cost 2.1 2.1 1.9
Actuarial (gain) loss (45.7) (3.4)  
Plan Amendments 0.0 0.1  
Benefits paid (4.4) (5.0)  
Foreign currency exchange rate changes (28.2) 3.1  
Benefit obligation, end of year 101.1 176.1 158.7
Changes in plan assets:      
Fair value of plan assets, beginning of year 147.4 120.5  
Assets assumed from acquisition 0.0 17.2  
Actual return on plan assets (30.1) 4.6  
Employer contributions 4.8 6.6  
Benefits paid (4.4) (5.0)  
Foreign currency exchange rate changes (24.6) 3.5  
Fair value of plan assets, end of year 93.1 147.4 $ 120.5
Funded Status (8.0) (28.7)  
Amounts recognized in statement of financial position      
Deferred charges and other 4.6 12.4  
Other accrued expenses 0.0 0.0  
Other long-term liabilities 12.6 41.1  
Accumulated other comprehensive loss $ 21.8 $ 43.2  
Weighted average assumptions      
Rate of compensation increase 2.75% 2.50%  
Minimum | Non U.S. Plans      
Weighted average assumptions      
Discount rate 3.70% 1.00%  
Maximum | Non U.S. Plans      
Weighted average assumptions      
Discount rate 5.20% 2.00%