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Business Combinations (Acquisition of Dyax) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jan. 22, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]              
Goodwill   $ 19,482.1 $ 12,962.4 $ 19,482.1 $ 12,962.4 $ 17,888.2 $ 4,147.8
Integration and acquisition costs   $ 343.7 $ 363.0 $ 459.7 $ 454.1    
Dyax              
Business Acquisition [Line Items]              
Purchase price paid per share of acquiree, in cash (in USD per share) $ 37.30            
Contingent consideration payable (in usd per share) $ 4.00            
Preliminary fair value of identifiable assets acquired and liabilities assumed $ 6,330.0            
Cash paid on closing 5,934.0            
Contingent consideration payable 396.0            
Maximum amount of contingent cash consideration 646.0            
Goodwill 2,702.1            
Currently marketed products | Dyax              
Business Acquisition [Line Items]              
Intangible assets 135.0            
In-Process Research and Development (IPR&D) | Dyax              
Business Acquisition [Line Items]              
Intangible assets 4,100.0            
Other intangible assets | Dyax              
Business Acquisition [Line Items]              
Intangible assets $ 425.0            
Weighted average amortization period of acquired amortizable intangible assets 8 years            
KALBITOR | Dyax              
Business Acquisition [Line Items]              
Estimated useful life of intangible assets 18 years            
SHP643 | Dyax              
Business Acquisition [Line Items]              
Discount rate used in determining fair value of acquired in process research and development, high rate 9.00%            
Minimum | Other intangible assets | Dyax              
Business Acquisition [Line Items]              
Estimated useful life of intangible assets 7 years            
Maximum | Other intangible assets | Dyax              
Business Acquisition [Line Items]              
Estimated useful life of intangible assets 9 years