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Research Collaboration and License Agreements - Schedule of Contract Balances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Accounts receivable    
Beginning balance $ 5.7 $ 0.0
Additions 21.1 12.4
Payments received (25.8) (6.7)
Ending balance 1.0 5.7
Accounts payable related to collaborations    
Beginning balance 5.3 13.1
Additions 46.4 48.9
Payments made (34.9) (56.7)
Ending balance 16.8 5.3
Contract assets: Collaboration contract asset    
Beginning balance 7.8 9.4
Additions 0.0 3.0
Amortization (4.3) (4.6)
Ending balance 3.5 7.8
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 (242.6) (101.0)
Revenue recognized from balances not held at the beginning of the period 0.0 (130.0)
Ending balance $ 205.6 $ 448.2