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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, 2021
Sep. 30, 2020
Sep. 30, 2019
U.S. Plan      
Components of net periodic benefit cost (income):      
Interest cost $ 1.5 $ 2.6 $ 3.5
Expected return on plan assets (3.4) (3.9) (4.0)
Net amortization 2.1 1.8 1.4
Net periodic benefit cost (income) $ 0.2 $ 0.5 $ 0.9
Weighted average assumptions used in development of net periodic benefit cost (income):      
Weighted average discount rate - interest cost 1.43% 2.44% 3.67%
Expected return on plan assets 4.25% 5.00% 5.25%
International Plan      
Components of net periodic benefit cost (income):      
Interest cost $ 2.6 $ 2.7 $ 4.0
Expected return on plan assets (5.5) (6.9) (7.1)
Net amortization 1.3 1.0 0.8
Net periodic benefit cost (income) $ (1.6) $ (3.2) $ (2.3)
Weighted average assumptions used in development of net periodic benefit cost (income):      
Weighted average discount rate - interest cost 1.26% 1.42% 2.34%
Expected return on plan assets 2.45% 3.39% 3.94%