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Research Collaboration and License Agreements - Summary of Contract Balances (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Accounts receivable related to collaborations    
Beginning balance $ 5.7 $ 0.0
Additions 0.1 1.8
Payments received (5.3) 0.0
Ending balance 0.5 1.8
Accounts payable related to collaborations    
Beginning balance 5.4 13.1
Additions 29.5 29.2
Payments made (24.8) (26.1)
Ending balance 10.1 16.2
Contract assets: Collaboration contract asset    
Beginning balance 7.8 9.4
Additions 0.0 3.0
Amortization (3.7) (1.7)
Ending balance 4.1 10.7
Contract liabilities: Deferred revenue    
Beginning balance 448.2 549.2
Additions to collaboration agreements 0.0 130.0
Revenue recognized from balances held at the beginning of the period (211.2) (56.3)
Revenue recognized from new collaborations 0.0 (23.7)
Ending balance $ 237.0 $ 599.2