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Acquisitions (Asset Acquisitions) (Details) - USD ($) $ in Millions	1 Months Ended						3 Months Ended		6 Months Ended
	May 31, 2021	Mar. 31, 2021	Jan. 31, 2021	Jun. 30, 2020	May 31, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Acquired IPR&D Expense							$ 25.0	$ 241.8	$ 324.3	$ 294.1
Acquired in-process research and development (Note 3)							$ 25.0	$ 241.8	$ 324.3	$ 294.1
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
MiNA Therapeutics Limited
Business Acquisition [Line Items]
Acquired IPR&D Expense	$ 25.0
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
Shanghai Junshi Biosciences Co., Ltd. (Junshi Biosciences)
Business Acquisition [Line Items]
Acquired IPR&D Expense					20.0
Undisclosed
Business Acquisition [Line Items]
Acquired IPR&D Expense					$ 174.8
Evox Therapeutics Limited
Business Acquisition [Line Items]
Acquired IPR&D Expense				$ 22.0

X

- Definition

The amount of EXPENSE related to research and development assets that are acquired in a business combination (pre-141R) and/or licensing arrangement that have no alternative future use and are therefore written off in the period of acquisition (INCOME STATEMENT)

+ References

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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=123570139&loc=d3e3213-108585

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