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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 2,918.8	$ 3,132.5	$ 2,998.1
Two Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk	33.90%	32.90%	31.40%
HPC
Disaggregation of Revenue [Line Items]
Net sales	$ 1,243.3	$ 1,370.1	$ 1,260.1
HPC brand portfolio transitions | HPC
Disaggregation of Revenue [Line Items]
Net sales	$ 350.4	$ 417.3	$ 400.2

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