Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Receivables, net
Accounts receivable, trade	$ 205.6	$ 147.3
Accounts receivable, other	15.1	21.2
Total receivables, gross	220.7	168.5
Allowance for doubtful accounts	(0.3)	(0.3)
Receivables, net	220.4	168.2
Inventories
Inventory, raw materials, net	57.3	60.4
Inventory, work in process	0.0	0.1
Inventory, finished goods, net	228.8	133.8
Inventories	286.1	194.3
Accounts Payable
Accounts payable, trade	119.1	85.0
Accounts Payable, Related Party, Name [Extensible Enumeration]	1.5	2.5
Accounts payable, other	0.4	1.5
Accounts payable	121.0	89.0
Other Current Liabilities
Estimated litigation liability, current	21.0	21.0
Accrued salaries, current	23.8	14.8
Accrued advertising and promotion expense	8.1	5.4
Other accrued liabilities, current	29.8	20.0
Other current liabilities	$ 82.7	$ 61.2