v3.24.1.u1
Collaborative and Other Relationships - Summary of Activity Related to ADUHELM Collaboration (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Collaborative arrangements and non-collaborative arrangement transactions    
Selling, general and administrative $ 581.5 $ 605.0
LEQEMBI Collaboration    
Collaborative arrangements and non-collaborative arrangement transactions    
Share of non-controling interest recognized 50.00%