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Acquisitions (Asset Acquisitions) (Details) - USD ($) $ in Millions	1 Months Ended						12 Months Ended
	Feb. 28, 2022	Dec. 31, 2021	Mar. 31, 2021	Jan. 31, 2021	Oct. 31, 2020	May 31, 2020	Dec. 31, 2022
Business Acquisition [Line Items]
Acquired IPR&D Expense							$ 333.8
BioMarin Pharmaceutical Inc.
Business Acquisition [Line Items]
Acquired IPR&D Expense	$ 110.0
Foghorn Therapeutics Inc.
Business Acquisition [Line Items]
Acquired IPR&D Expense		$ 316.6
Rigel Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Acquired IPR&D Expense			$ 125.0
Precision Biosciences, Inc.
Business Acquisition [Line Items]
Acquired IPR&D Expense				$ 107.8
Innovent Biologics, Inc. (Innovent)
Business Acquisition [Line Items]
Acquired IPR&D Expense					$ 200.0
Petra Pharma Corporation (Petra)
Business Acquisition [Line Items]
Acquired IPR&D Expense						$ 174.8
Disarm Therapeutics, Inc.
Business Acquisition [Line Items]
Acquired IPR&D Expense					$ 126.3

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