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RESTRUCTURING CHARGES - Rollforward of Restructuring Accrual (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning $ 10.2 $ 10.2
Provisions 3.7 10.3
Cash expenditures (7.0) (10.1)
Non-cash items (2.9) (0.2)
Accrual balance at ending 4.0 10.2
Termination Benefits    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning 4.6 3.9
Provisions 8.0 5.7
Cash expenditures (6.3) (4.7)
Non-cash items (2.6) (0.3)
Accrual balance at ending 3.7 4.6
Other Costs    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning 5.6 6.3
Provisions (4.3) 4.6
Cash expenditures (0.7) (5.4)
Non-cash items (0.3) 0.1
Accrual balance at ending $ 0.3 $ 5.6