Collaboration, License, and Other Agreements - Schedule of Contract Balances, Alnylam Collaboration (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Accrued expenses and other current liabilities	$ 2,392.9	$ 2,357.9
Alnylam Pharmaceuticals, Inc. Collaboration Agreement
Disaggregation of Revenue [Line Items]
Accrued expenses and other current liabilities	$ 18.9	$ 22.6