Intangible Assets (Summary of Intangible Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross acquired intangible assets	$ 36,306.9	$ 37,806.3
Less: Accumulated amortization	(3,472.8)	(3,108.8)
Intangible assets, net	32,834.1	34,697.5	$ 13,715.6	$ 9,173.3
Currently marketed products
Finite-Lived Intangible Assets [Line Items]
Gross acquired intangible assets	30,337.5	31,217.5
Less: Accumulated amortization	(3,242.8)	(2,908.6)
Intangible assets, net	27,094.7	28,308.9
IPR&D
Finite-Lived Intangible Assets [Line Items]
Gross acquired intangible assets	5,127.2	5,746.6
Less: Accumulated amortization	0.0	0.0
Intangible assets, net	5,127.2	5,746.6
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross acquired intangible assets	842.2	842.2
Less: Accumulated amortization	(230.0)	(200.2)
Intangible assets, net	$ 612.2	$ 642.0