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Fair Value Measurements - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Debt Instrument [Line Items]      
Asset impairment charges $ 0 $ 0  
Contingent consideration obligations $ 266,900,000 $ 246,400,000  
Minimum | Human Immunology Biosciences | Measurement Input, Probability Rate      
Debt Instrument [Line Items]      
Discount rate 0.750    
Maximum | Human Immunology Biosciences | Phase 3 Clinical Trial, Felzartamab AMR      
Debt Instrument [Line Items]      
Contingent consideration obligations     $ 150,000,000.0
Maximum | Human Immunology Biosciences | Measurement Input, Probability Rate      
Debt Instrument [Line Items]      
Discount rate 0.950