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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

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