INCOME TAXES - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Deferred tax assets
Employee benefits	$ 27.4	$ 22.9
Inventories and receivables	28.0	31.9
Marketing and promotional accruals	5.1	5.3
Property, plant and equipment	2.3	2.8
Unrealized losses	22.2	30.5
Intangibles	9.6	9.3
Operating lease liabilities	27.7	27.6
Net operating loss and other carry forwards	322.2	331.6
Other	21.1	17.0
Total deferred tax assets	465.6	478.9
Deferred tax liabilities
Property, plant and equipment	4.4	7.9
Unrealized gains	6.8	11.1
Intangibles	171.8	167.2
Operating lease assets	23.4	24.6
Investment in partnership	78.3	80.3
Taxes on unremitted foreign earnings	1.7	1.2
Other	13.7	13.0
Total deferred tax liabilities	300.1	305.3
Net deferred tax liabilities	165.5	173.6
Valuation allowance	(321.4)	(333.4)	$ (337.4)
Net deferred tax liabilities, net valuation allowance	(155.9)	(159.8)
Reported as:
Deferred charges and other	14.9	15.0
Deferred income taxes (noncurrent liability)	$ 170.8	$ 174.8