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Fair Value Measurements and Financial Instruments - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Gain (losses) on equity securities still held $ (20.5) $ (45.9)  
Financial Royalty Assets, Current      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Financial royalty asset, percentage of non-controlling interest 10.00%   7.00%
Financial Royalty Assets, Non-current      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Financial royalty asset, percentage of non-controlling interest 6.00%   7.00%
Level 3 | Estimate of Fair Value Measurement      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Financing receivables, fair value disclosure, current $ 800.0   $ 900.0
Financing receivables, fair value disclosure, non-current $ 23,900.0   $ 23,400.0
Level 3 | Measurement Input, Option Volatility      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Measurement input 0.425   0.425
Level 3 | Measurement Input, Discount Rate | Cytokinetics      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Measurement input 0.118   0.109