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Segment Information (Reconciliation of Segment Information to Total Consolidated Information) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net sales		$ 15,388.4	$ 16,218.1	$ 17,813.6
Segment Profitability		766.2	1,614.9	(34.0)
Intangible asset amortization expense		(2,317.1)	(2,504.6)	(2,702.2)
Impairment of goodwill		(581.0)	(117.0)	0.0
Acquired IPR&D		(105.5)	(36.4)	(70.1)
Litigation settlements & other contingencies		$ (111.6)	(4.4)	(329.2)
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]		Cost of Goods and Services Sold
Disposal Group, Held-for-sale, Not Discontinued Operations \| OTC Business
Segment Reporting Information [Line Items]
Impairment of goodwill	$ (580.1)	$ (580.1)
Operating Segments
Segment Reporting Information [Line Items]
Net sales		15,388.4	16,218.1
Segment Profitability		7,128.1	8,263.2	8,705.0
Segment Reconciling
Segment Reporting Information [Line Items]
Intangible asset amortization expense		(2,317.1)	(2,504.6)	(2,702.2)
Intangible asset disposal & impairment charges		(32.0)	(173.5)	(102.8)
Globally managed research and development costs		(805.2)	(662.2)	(681.0)
Litigation settlements & other contingencies		(111.6)	(4.4)	(329.2)
Transaction related and other special items		(774.4)	(1,026.9)	(2,832.2)
Corporate (Other)
Segment Reporting Information [Line Items]
Corporate and other unallocated		(1,636.0)	(2,123.3)	(2,021.5)
Developed Markets
Segment Reporting Information [Line Items]
Impairment of goodwill		(544.0)
Developed Markets \| Operating Segments
Segment Reporting Information [Line Items]
Net sales		9,251.9	9,768.9	10,428.7
Segment Profitability		4,086.5	4,878.1	5,143.1
Greater China
Segment Reporting Information [Line Items]
Impairment of goodwill		0.0
Greater China \| Operating Segments
Segment Reporting Information [Line Items]
Net sales		2,160.4	2,201.2	2,212.8
Segment Profitability		1,426.8	1,512.5	1,397.1
JANZ
Segment Reporting Information [Line Items]
Impairment of goodwill		(30.0)
JANZ \| Operating Segments
Segment Reporting Information [Line Items]
Net sales		1,424.5	1,632.4	2,027.4
Segment Profitability		522.9	665.5	762.4
Emerging Markets \| Operating Segments
Segment Reporting Information [Line Items]
Net sales		2,551.6	2,615.6	3,144.7
Segment Profitability		$ 1,091.9	$ 1,207.1	$ 1,402.4