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Acquisitions (Asset Acquisitions) (Details) - USD ($) $ in Millions	1 Months Ended				3 Months Ended
	Mar. 31, 2021	Jan. 31, 2021	May 31, 2020	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Business Acquisition [Line Items]
Acquired IPR&D Expense					$ 299.3	$ 52.3
Precision Biosciences, Inc.
Business Acquisition [Line Items]
Acquired IPR&D Expense		$ 107.8
Merus N.V.
Business Acquisition [Line Items]
Acquired IPR&D Expense		46.5
Asahi Kasei Pharma Corporation
Business Acquisition [Line Items]
Acquired IPR&D Expense		$ 20.0
Rigel Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Acquired IPR&D Expense	$ 125.0
Sitryx Therapeutics Limited
Business Acquisition [Line Items]
Acquired IPR&D Expense				$ 52.3
AbCellera Biologics Inc.
Business Acquisition [Line Items]
Acquired IPR&D Expense			$ 25.0	$ 25.0

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- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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