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Research Collaboration and License Agreements - Summary of Contract Balances (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Accounts receivable
Beginning balance	$ 15.0	$ 0.0
Additions	1.4	0.0
Payments received	(15.0)	0.0
Ending balance	1.4	0.0
Contract assets: Collaboration contract asset
Beginning balance	12.5	0.0
Amortization	(0.8)	0.0
Ending balance	11.7	0.0
Contract liabilities: Deferred revenue
Beginning balance	740.5	45.1
Revenue recognized from balances held at the beginning of the period	(55.5)	(11.1)
Additions to collaboration agreements	3.0	3.0
Ending balance	$ 688.0	$ 37.0

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