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EMPLOYEE BENEFIT PLANS - Schedule of Additional Information on Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Changes in benefit obligation:      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest expense Interest expense  
Changes in plan assets:      
Fair value of plan assets, beginning of year $ 151.7    
Fair value of plan assets, end of year 162.6 $ 151.7  
Amounts recognized in statement of financial position      
Deferred charges and other 39.9 31.8  
Other long-term liabilities 32.8 52.5  
Accumulated other comprehensive loss $ (204.0) (249.4)  
Weighted average assumptions      
Defined Benefit Plan, Type [Extensible Enumeration] Pension Plan [Member]    
U.S. Plans      
Changes in benefit obligation:      
Benefit obligation, beginning of year $ 50.9 53.5  
Service cost 0.7 0.6 $ 0.5
Interest cost 2.8 2.8 1.9
Actuarial gain 4.4 (1.7)  
Settlements and curtailments 0.0 0.0  
Benefits paid (4.8) (4.3)  
Foreign currency exchange rate changes 0.0 0.0  
Benefit obligation, end of year 54.0 50.9 53.5
Changes in plan assets:      
Fair value of plan assets, beginning of year 49.0 50.3  
Actual return on plan assets 8.9 2.9  
Employer contributions 0.1 0.1  
Settlements and curtailments 0.0 0.0  
Benefits paid (4.8) (4.3)  
Foreign currency exchange rate changes 0.0 0.0  
Fair value of plan assets, end of year 53.2 49.0 50.3
Funded status (0.8) (1.9)  
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 0.7 1.8  
Accumulated other comprehensive loss 7.7 $ 9.4  
Weighted average assumptions      
Discount rate   5.72%  
Non U.S. Plans      
Changes in benefit obligation:      
Benefit obligation, beginning of year 106.5 $ 101.1  
Service cost 0.7 0.8 1.2
Interest cost 5.0 4.6 2.1
Actuarial gain 8.0 (4.5)  
Settlements and curtailments (11.1) 0.0  
Benefits paid (4.5) (4.2)  
Foreign currency exchange rate changes 8.1 8.7  
Benefit obligation, end of year 112.7 106.5 101.1
Changes in plan assets:      
Fair value of plan assets, beginning of year 102.7 93.1  
Actual return on plan assets 7.9 (1.1)  
Employer contributions 6.4 6.8  
Settlements and curtailments (11.1) 0.0  
Benefits paid (4.5) (4.2)  
Foreign currency exchange rate changes 8.0 8.1  
Fair value of plan assets, end of year 109.4 102.7 $ 93.1
Funded status (3.3) (3.8)  
Amounts recognized in statement of financial position      
Deferred charges and other 12.4 9.6  
Other accrued expenses 0.0 0.0  
Other long-term liabilities 15.7 13.4  
Accumulated other comprehensive loss $ 29.5 $ 23.8  
Weighted average assumptions      
Rate of compensation increase 2.75% 2.75%  
Minimum | U.S. Plans      
Weighted average assumptions      
Discount rate 4.39%    
Minimum | Non U.S. Plans      
Weighted average assumptions      
Discount rate 3.40% 4.00%  
Maximum | U.S. Plans      
Weighted average assumptions      
Discount rate 4.74%    
Maximum | Non U.S. Plans      
Weighted average assumptions      
Discount rate 5.10% 5.20%