Goodwill and Other Intangible Assets (Components of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, original cost	$ 20,338.7	$ 17,550.9
Finite-lived intangible assets, accumulated amortization	5,906.1	4,024.2
Finite-lived intangible assets, net book value	14,432.6	13,526.7
In-process research and development	813.2	921.1
Intangible assets, gross, excluding goodwill	21,151.9	18,472.0
Intangible assets, net book value, excluding goodwill	$ 15,245.8	$ 14,447.8
Product rights and licenses
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible asset, estimated useful life, in years	15 years	15 years
Finite-lived intangible assets, original cost	$ 19,762.9	$ 16,968.4
Finite-lived intangible assets, accumulated amortization	5,373.7	3,585.7
Finite-lived intangible assets, net book value	$ 14,389.2	$ 13,382.7
Patents and technologies
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible asset, estimated useful life, in years	20 years	20 years
Finite-lived intangible assets, original cost	$ 116.6	$ 116.6
Finite-lived intangible assets, accumulated amortization	113.1	108.5
Finite-lived intangible assets, net book value	$ 3.5	$ 8.1
Other
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible asset, estimated useful life, in years	6 years	6 years
Finite-lived intangible assets, original cost	$ 459.2	$ 465.9
Finite-lived intangible assets, accumulated amortization	419.3	330.0
Finite-lived intangible assets, net book value	$ 39.9	$ 135.9
Respiratory delivery platform
Intangible Assets Excluding Goodwill [Line Items]
In-process research and development			$ 347.2