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SEGMENT INFORMATION - Net Sales Relating to Segments (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Revenue from External Customer [Line Items]      
Net sales $ 3,132.5 $ 2,998.1 $ 2,622.1
HPC      
Revenue from External Customer [Line Items]      
Net sales 1,370.1 1,260.1 1,107.6
GPC      
Revenue from External Customer [Line Items]      
Net sales 1,175.3 1,129.9 962.6
H&G      
Revenue from External Customer [Line Items]      
Net sales $ 587.1 $ 608.1 $ 551.9