Discontinued Operations - Sales from Global Products (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	$ 1,443.5	$ 1,236.1	$ 1,037.2
Discontinued Operations, Held-for-sale | Global Products
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	$ 89.7	$ 218.1	$ 143.1