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RETIREMENT PLANS - Components of Net Periodic Benefit Cost and Weighted Average Assumptions (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
International Plan      
Components of net periodic benefit cost:      
Interest cost $ 5.5 $ 5.9 $ 6.2
Expected return on plan assets (5.8) (5.7) (5.5)
Net amortization 2.5 2.3 2.0
Net periodic benefit cost $ 2.2 $ 2.5 $ 2.7
Weighted average assumptions used in development of net periodic benefit cost:      
Weighted average discount rate - interest cost 4.70% 5.38% 5.29%
Expected return on plan assets 4.25% 4.42% 3.91%
U.S. Plan      
Components of net periodic benefit cost:      
Interest cost $ 3.1 $ 3.7 $ 3.6
Expected return on plan assets (2.3) (2.2) (2.5)
Net amortization 1.7 1.7 1.8
Net periodic benefit cost $ 2.5 $ 3.2 $ 2.9
Weighted average assumptions used in development of net periodic benefit cost:      
Weighted average discount rate - interest cost 4.37% 5.46% 4.87%
Expected return on plan assets 4.25% 4.25% 4.50%