Collaboration, License, and Other Agreements - U.S. Government Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues		$ 13,117.2	$ 12,172.9	$ 16,071.7
Other Transaction Agreement
Disaggregation of Revenue [Line Items]
Percentage of trial costs required to be funded by collaborating party	70.00%
"Next Generation" Covid Antibodies | Other Transaction Agreement | Collaboration revenue
Disaggregation of Revenue [Line Items]
Revenues		50.4
U.S. government | "Next Generation" Covid Antibodies
Disaggregation of Revenue [Line Items]
Maximum transaction agreement payments		$ 326.0