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RESTRUCTURING CHARGES - Rollforward of Restructuring Accrual (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning $ 4.0 $ 10.2
Provisions 8.2 3.7
Cash expenditures (8.4) (7.0)
Non-cash items 0.1 (2.9)
Accrual balance at ending 3.9 4.0
Termination Benefits    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning 3.7 4.6
Provisions 7.6 8.0
Cash expenditures (8.1) (6.3)
Non-cash items 0.2 (2.6)
Accrual balance at ending 3.4 3.7
Other Costs    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning 0.3 5.6
Provisions 0.6 (4.3)
Cash expenditures (0.3) (0.7)
Non-cash items (0.1) (0.3)
Accrual balance at ending $ 0.5 $ 0.3