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Subsequent Events
12 Months Ended
Dec. 31, 2022
Subsequent Events [Abstract]  
Subsequent Events Subsequent EventsIn January 2023, we acquired an interest in Ionis Pharmaceuticals, Inc.’s royalty in Biogen’s Spinraza (nusinersen) and Novartis’ pelacarsen, a development-stage product, for up to $1.125 billion, including an upfront payment of $500 million and up to $625 million in additional pelacarsen milestone payments.