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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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