INCOME TAXES - Schedule of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Taxes [Line Items]
United States	$ (399.8)	$ (263.0)	$ (147.2)
Outside the United States	109.6	172.7	136.1
Loss from continuing operations before income taxes	(290.2)	(90.3)	(11.1)
SB/RH
Income Taxes [Line Items]
United States	(391.0)	(260.6)	(143.8)
Outside the United States	109.6	172.7	136.1
Loss from continuing operations before income taxes	$ (281.4)	$ (87.9)	$ (7.7)