Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Class of Stock [Line Items]
Shares repurchased	3.0	0.1
Average price per share	$ 31.95	$ 77.12
Purchases of treasury stock	$ 97.8	$ 11.0
Excise Tax Payable, Current	$ 0.9
Excise tax payment		$ 0.8