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SEGMENT INFORMATION - Net Sales Relating to Segments (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Revenue from External Customer [Line Items]      
Net sales $ 2,918.8 $ 3,132.5 $ 2,998.1
GPC      
Revenue from External Customer [Line Items]      
Net sales 1,139.0 1,175.3 1,129.9
H&G      
Revenue from External Customer [Line Items]      
Net sales 536.5 587.1 608.1
HPC      
Revenue from External Customer [Line Items]      
Net sales $ 1,243.3 $ 1,370.1 $ 1,260.1