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Collaborations and Other Arrangements (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired IPR&D charges		$ 874.9	$ 660.4	$ 239.6
Revenues		28,318.4	24,539.8	22,319.5
Shanghai Junshi Biosciences Co., Ltd. (Junshi Biosciences)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired IPR&D charges	$ 20.0
Petra Pharma Corporation (Petra)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired IPR&D charges	$ 174.8
China
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues		1,661.4	1,116.9	939.4
Milestone Payments, Capitalized As Intangible Assets | Shanghai Junshi Biosciences Co., Ltd. (Junshi Biosciences)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		195.0
Milestone Payments, Success-based Regulatory And Sales-based | Shanghai Junshi Biosciences Co., Ltd. (Junshi Biosciences)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired IPR&D charges			50.0
Milestone Payments, Contingent Upon Initiation Of Phase I Trial | Petra Pharma Corporation (Petra)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		205.0
Milestone Payments, Contingent Upon Achieving Clinical Proof Of Concept | Petra Pharma Corporation (Petra)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		164.0
Olumiant®
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues		$ 1,115.1	638.9	426.9
Olumiant® | Royalty Payments Received
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborative arrangement, rights and obligations percent (up to)		20.00%
Olumiant® | Milestone Payments, Development and Regulatory, Capitalized (Deferred), Cumulative
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		$ 260.0	210.0
Olumiant® | Milestone Payments, Development and Regulatory
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		100.0
Olumiant® | Milestone Payments, Sales-based
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		100.0
COVID-19 Antibodies
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues		2,240.0	871.2
Tyvyt®
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues		418.1	$ 308.7	$ 134.0
Tyvyt® | Milestone Payments, Capitalized As Intangible Assets
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments					$ 40.0
Tyvyt® | Milestone Payments, Success-based Regulatory And Sales-based | Outside of China | Innovent Biologics, Inc. (Innovent)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		825.0
Tyvyt® | Milestone Payments, Success-based Regulatory And Sales-based | China | Innovent Biologics, Inc. (Innovent)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		195.0
Lebrikizumab | Milestone Payments, Development and Regulatory
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		85.0
Lebrikizumab | Milestone Payments, Development and Regulatory | Roche
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		180.0
Lebrikizumab | Milestone Payments, Sales-based
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		1,250.0
Lebrikizumab | Milestone Payments, Sales-based | Roche
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestones payments		$ 1,030.0

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