Intangible Assets (Summary of Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross acquired intangible assets	$ 37,739.6	$ 37,806.3
Less: Accumulated amortization	(4,389.3)	(3,108.8)
Intangible assets, net	33,350.3	34,697.5	$ 38,871.5	$ 9,173.3
Currently marketed products
Finite-Lived Intangible Assets [Line Items]
Gross acquired intangible assets	31,786.3	31,217.5
Less: Accumulated amortization	(4,094.0)	(2,908.6)
Intangible assets, net	27,692.3	28,308.9
IPR&D
Finite-Lived Intangible Assets [Line Items]
Gross acquired intangible assets	5,113.0	5,746.6
Less: Accumulated amortization	0.0	0.0
Intangible assets, net	5,113.0	5,746.6
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross acquired intangible assets	840.3	842.2
Less: Accumulated amortization	(295.3)	(200.2)
Intangible assets, net	$ 545.0	$ 642.0