Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
In-process research and development	$ 115.0		$ 115.0		$ 120.3
Contingent consideration	223.2		223.2		250.7
Business Combination Contingent Consideration Liability Payments			(52.3)
IPR&D intangible asset impairment charges	0.0	$ 0.0	0.0	$ 29.5
Goodwill	9,523.3		9,523.3		9,590.6
Europe Segment
Finite-Lived Intangible Assets [Line Items]
Goodwill	4,553.2		4,553.2		4,548.6
Rest of World Segment
Finite-Lived Intangible Assets [Line Items]
Goodwill	1,685.7		1,685.7		1,718.6
Prepaid expenses and other current assets
Finite-Lived Intangible Assets [Line Items]
Contingent consideration	119.8		119.8		$ 120.4
Business Combination Contingent Consideration Liability Payments			(52.3)
Other revenue
Finite-Lived Intangible Assets [Line Items]
IPR&D intangible asset impairment charges		$ (40.4)		$ (69.9)
Rest of World Segment
Finite-Lived Intangible Assets [Line Items]
Goodwill	1,650.0		1,650.0
Europe Segment
Finite-Lived Intangible Assets [Line Items]
Goodwill	4,430.0		4,430.0
North America Brands
Finite-Lived Intangible Assets [Line Items]
Goodwill	650.0		650.0
North America Generics
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,600.0		$ 2,600.0