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EMPLOYEE BENEFIT PLANS - Schedule of Additional Information on Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Changes in plan assets      
Fair value of plan assets, beginning of year $ 162.6    
Fair value of plan assets, end of year 161.5 $ 162.6  
Amounts recognized in statement of financial position      
Deferred charges and other 62.5 39.9  
Other long-term liabilities 19.1 32.8  
Accumulated other comprehensive loss $ (171.9) (204.0)  
Weighted average assumptions      
Defined Benefit Plan, Type [Extensible Enumeration] Pension Plan [Member]    
U.S. Plans      
Changes in benefit obligation      
Benefit obligation, beginning of year $ 54.0 50.9  
Service cost 0.4 0.7 $ 0.6
Interest cost $ 2.4 $ 2.8 2.8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest expense Interest expense  
Actuarial loss $ (2.2) $ 4.4  
Curtailments 0.0 0.0  
Benefits paid (4.5) (4.8)  
Foreign currency exchange rate changes 0.0 0.0  
Benefit obligation, end of year 50.1 54.0 50.9
Changes in plan assets      
Fair value of plan assets, beginning of year 53.2 49.0  
Actual return on plan assets 2.3 8.9  
Employer contributions 0.1 0.1  
Curtailments 0.0 0.0  
Benefits paid (4.5) (4.8)  
Foreign currency exchange rate changes 0.0 0.0  
Fair value of plan assets, end of year 51.1 53.2 49.0
Funded Status 1.0 (0.8)  
Amounts recognized in statement of financial position      
Deferred charges and other 1.2 0.0  
Other accrued expenses 0.0 0.1  
Other long-term liabilities 0.2 0.7  
Accumulated other comprehensive loss 4.5 7.7  
Non U.S. Plans      
Changes in benefit obligation      
Benefit obligation, beginning of year 112.7 106.5  
Service cost 0.8 0.7 0.8
Interest cost $ 4.4 $ 5.0 4.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest expense Interest expense  
Actuarial loss $ (8.5) $ 8.0  
Curtailments 0.0 (11.1)  
Benefits paid (4.4) (4.5)  
Foreign currency exchange rate changes 3.2 8.1  
Benefit obligation, end of year 108.2 112.7 106.5
Changes in plan assets      
Fair value of plan assets, beginning of year 109.4 102.7  
Actual return on plan assets (0.1) 7.9  
Employer contributions 2.7 6.4  
Curtailments 0.0 (11.1)  
Benefits paid (4.4) (4.5)  
Foreign currency exchange rate changes 2.8 8.0  
Fair value of plan assets, end of year 110.4 109.4 $ 102.7
Funded Status 2.2 (3.3)  
Amounts recognized in statement of financial position      
Deferred charges and other 13.0 12.4  
Other accrued expenses 0.0 0.0  
Other long-term liabilities 10.8 15.7  
Accumulated other comprehensive loss $ 24.8 $ 29.5  
Weighted average assumptions      
Rate of compensation increase 2.75% 2.75%  
Minimum | U.S. Plans      
Weighted average assumptions      
Discount rate 4.79% 4.39%  
Minimum | Non U.S. Plans      
Weighted average assumptions      
Discount rate 3.90% 3.40%  
Maximum | U.S. Plans      
Weighted average assumptions      
Discount rate 5.10% 4.74%  
Maximum | Non U.S. Plans      
Weighted average assumptions      
Discount rate 5.90% 5.10%