SEGMENT INFORMATION - Schedule of Net Sales Relating to Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer [Line Items]
Net sales	$ 2,963.9	$ 2,918.8	$ 3,132.5
GPC
Revenue from External Customer [Line Items]
Net sales	1,151.5	1,139.0	1,175.3
H&G
Revenue from External Customer [Line Items]
Net sales	578.6	536.5	587.1
HPC
Revenue from External Customer [Line Items]
Net sales	$ 1,233.8	$ 1,243.3	$ 1,370.1