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Stockholders' Equity - Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Class of Stock [Line Items]
Total cost	$ 60.3	$ 229.0	$ 1,539.6
Excise tax on share repurchases	$ 16.4
Tender Offer
Class of Stock [Line Items]
Shares repurchased (in shares)			27.0
Total cost			$ 1,024.0
Shares repurchased and retired, fees and expenses			16.4
Excise tax on share repurchases			$ 10.2

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