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Collaborative and Other Relationships - ADUHELM Collaboration Agreement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Collaborative arrangements and non-collaborative arrangement transactions
Royalty cost of sales	$ 2,404.2	$ 2,310.4	$ 2,533.4
Eisai
Collaborative arrangements and non-collaborative arrangement transactions
Amounts receivable	90.2	16.7
Amounts payable	$ 95.5	$ 138.0

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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