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Description of the Business and Summary of Significant Accounting Policies - Reduction in Workforce (Narrative) (Details) - 2024 Global Workforce Reduction Plan - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2024	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]
Expected reduction of workforce	20.00%
Costs incurred to date		$ 65.2	$ 65.2	$ 65.2
Payments for restructuring, including pro rata amount		0.7	13.2
Charges		$ 0.2	$ 3.7	$ 50.9

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