v3.26.1
Research Collaboration and License Agreements - Summary of Sources of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 11, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Research Collaboration And License Agreements [Line Items]          
Revenue   $ 249.7 $ 22.4 $ 265.3 $ 211.2
Vepdegestrant | Collaboration Agreement Revenue          
Research Collaboration And License Agreements [Line Items]          
Revenue   133.7 21.1 148.1 211.0
Vepdegestrant | Milestone Revenue          
Research Collaboration And License Agreements [Line Items]          
Revenue   50.0 0.0 50.0 0.0
Pfizer, Inc. | Collaboration Agreement Revenue          
Research Collaboration And License Agreements [Line Items]          
Revenue   3.5 1.3 4.7 0.2
Rigel Pharmaceuticals, Inc. | License revenue          
Research Collaboration And License Agreements [Line Items]          
Revenue $ 42.5 $ 62.5 $ 0.0 $ 62.5 $ 0.0