Acquisitions and Other Transactions Acquisitions and Other Transactions (Apicore Inc) (Narrative) (Details) - USD ($) $ in Millions	Oct. 03, 2017	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 9,796.6	$ 10,205.7
Contingent consideration		$ 418.8	$ 453.7
Apicore [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 121.0
Acquired intangible assets, weighted average useful life, in years	7 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years
In-process research and development	$ 9.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	9.0
Goodwill	92.2
Amount of goodwill expected to be tax deductible	0.0
Business Acquisition, Goodwill, Expected Tax Deductible Amount	0.0
Contingent consideration	4.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	174.9
Maximum | Apicore [Member]
Business Acquisition [Line Items]
Purchase consideration, contingent consideration arrangements	15.0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset	$ 15.0