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Collaborative and Other Relationships - Alkermes (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Collaborative arrangements and non-collaborative arrangement transactions        
Inventory and purchase commitment charges   $ 2,109.7 $ 1,805.2 $ 1,955.4
Potential future milestone payments commitment to third party approximately   10,000.0    
Research and development   2,501.2 3,990.9 2,280.6
Alkermes        
Collaborative arrangements and non-collaborative arrangement transactions        
Potential future milestone payments commitment to third party approximately       155.0
Research and development   $ 26.5 32.4 53.5
VUMERITY | Alkermes        
Collaborative arrangements and non-collaborative arrangement transactions        
Percentage of royalties as per collaboration 15.00% 15.00%    
Royalties payable period, post FDA approval 5 years      
Inventory and purchase commitment charges   $ 61.6 $ 12.9 $ 1.6