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REVENUE - Summary of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of disaggregation of revenue from contracts with customers [line items]    
License and other revenue - total [1] $ 6.7 $ 9.4
Collaboration revenue 298.4 185.6
Total revenue 305.1 195.0
United States    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
License and other revenue - total 5.1 9.3
Collaboration revenue 216.4 158.9
China    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
License and other revenue - total 1.6 0.1
Outside the United States of America    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Collaboration revenue $ 82.0 $ 26.7
[1] Certain prior year amounts included within other revenue have been combined into the license and other revenue line for comparative purposes.