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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, 2024
Sep. 30, 2023
Sep. 30, 2022
International Plan      
Components of net periodic benefit cost (income):      
Interest cost $ 5.9 $ 6.2 $ 3.0
Expected return on plan assets (5.7) (5.5) (5.1)
Net amortization 2.3 2.0 1.3
Net periodic benefit cost (income) $ 2.5 $ 2.7 $ (0.8)
Weighted average assumptions used in development of net periodic benefit cost (income):      
Weighted average discount rate - interest cost 5.38% 5.29% 1.64%
Expected return on plan assets 4.42% 3.91% 2.37%
U.S. Plan      
Components of net periodic benefit cost (income):      
Interest cost $ 3.7 $ 3.6 $ 1.7
Expected return on plan assets (2.2) (2.5) (2.8)
Net amortization 1.7 1.8 1.7
Net periodic benefit cost (income) $ 3.2 $ 2.9 $ 0.6
Weighted average assumptions used in development of net periodic benefit cost (income):      
Weighted average discount rate - interest cost 5.46% 4.87% 1.74%
Expected return on plan assets 4.25% 4.50% 3.50%