Collaborative and Other Relationships - Alkermes (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Collaborative arrangements and non-collaborative arrangement transactions
Inventory and purchase commitment charges		$ 2,278.3	$ 2,109.7	$ 1,805.2
Potential future milestone payments commitment to third party approximately		9,300.0
Research and development		$ 2,231.1	2,501.2	3,990.9
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		$ 83.0	$ 61.6	$ 12.9