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Discontinued Operations - Narrative (Details) - Discontinued Operations, Held-for-sale - USD ($) $ in Millions		12 Months Ended
	Mar. 01, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of discontinued operations		$ 1,571.6	$ 0.0	$ 0.0
Global Products
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses	$ 2,650.0
Employee benefit obligations		17.1
Former Global Products Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of discontinued operations		$ (8.1)