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Certain Transactions - Other Transactions - Additional Information (Detail) $ in Millions				1 Months Ended				3 Months Ended				12 Months Ended
	Jan. 08, 2018 USD ($)	May 12, 2017 USD ($)	Mar. 03, 2016 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) Lawsuit	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)
Noncash or Part Noncash Acquisitions [Line Items]
Other asset impairments, restructuring and other items												$ 423.0	$ 987.0	$ 1,836.0
Net (gain) loss from sale of long-lived assets and investments												$ (18.0)	$ (19.0)	(1,090.0)
PGT Healthcare Partnership [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Other asset impairments, restructuring and other items									$ 64.0
Write-down of investment									94.0
Net (gain) loss from sale of long-lived assets and investments				$ 50.0
Rimsa [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Cash consideration			$ 2.3
Number of lawsuits filed | Lawsuit							2
Alder [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment	$ 25.0
Collaborative agreement milestone payments	$ 175.0
Otsuka [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment		$ 50.0
Attenukine [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment					$ 30.0
Milestone payment														$ 20.0
Additional considerations					$ 260.0
Ninlaro [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment						$ 150.0
Payment						150.0
Upfornt payments received						$ 150.0
Celltrion [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Refundable payment															$ 60.0
Total associated cost															$ 160.0
Regeneron [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment											$ 250.0
Collaborative agreement milestone payments								$ 60.0	$ 35.0	$ 25.0
Research and development costs							$ 1,000.0

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