Collaboration, License, and Other Agreements - Schedule of Accounts Receivable and Deferred Revenue Information, IO Collaboration (Details) - Sanofi Collaboration Agreement, Immuno-oncology - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Accounts receivable, net	$ (6.5)	$ (16.7)
Deferred revenue	10.7	9.4
Other liabilities	$ 280.9	$ 558.6