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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]      
Deferred revenue $ 1.1    
Net sales $ 3,132.5 $ 2,998.1 $ 2,622.1
Two Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk      
Disaggregation of Revenue [Line Items]      
Concentration risk 32.90% 31.40% 31.80%
HPC      
Disaggregation of Revenue [Line Items]      
Net sales $ 1,370.1 $ 1,260.1 $ 1,107.6
HPC brand portfolio transitions | HPC      
Disaggregation of Revenue [Line Items]      
Net sales $ 417.3 $ 400.2 $ 337.7