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REVENUE RECOGNITION AND RECEIVABLES - Schedule of Rollforward of Allowance for Product Returns (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 8.1 $ 7.7 $ 7.3
Charged to Profit & Loss 0.9 2.6 5.0
Deductions (2.5) (2.2) (1.4)
Foreign Currency and Other (0.2) 0.0 (3.2)
Ending Balance 6.3 8.1 7.7
Allowance For Product Returns [Roll Forward]      
Beginning Balance 14.4 12.8 15.5
Charged to Profit & Loss 16.4 28.6 8.7
Deductions (21.1) (27.3) (11.2)
Foreign Currency and Other 0.1 0.3 (0.2)
Ending Balance $ 9.8 $ 14.4 $ 12.8