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DERIVATIVES - Summary of Impact of Designated Hedges and Gain (Loss) (Details) - Cash Flow Hedge - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]      
Effective Portion, Gain (Loss) in OCI $ (1.9) $ (7.1) $ 14.3
Effective Portion, Reclassified to Continuing Operations (9.2) 4.6 10.4
Foreign exchange contracts | Net sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Effective Portion, Gain (Loss) in OCI 0.1 0.1 (0.4)
Effective Portion, Reclassified to Continuing Operations 0.1 (0.1) (0.2)
Foreign exchange contracts | Cost of goods sold      
Derivative Instruments, Gain (Loss) [Line Items]      
Effective Portion, Gain (Loss) in OCI (2.0) (7.2) 14.7
Effective Portion, Reclassified to Continuing Operations $ (9.3) $ 4.7 $ 10.6