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Business Combinations (Acquisition of Dyax) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
Jan. 22, 2016
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Goodwill   $ 19,718.4 $ 17,888.2 $ 14,850.6 $ 4,147.8
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        
Dyax | SHP643          
Business Acquisition [Line Items]          
Discount rate used in determining fair value of acquired in process research and development, high rate 9.00%        
Dyax | KALBITOR          
Business Acquisition [Line Items]          
Estimated useful life of intangible assets 18 years        
Dyax | Currently marketed products          
Business Acquisition [Line Items]          
Intangible assets $ 135.0        
Dyax | In-Process Research and Development (IPR&D)          
Business Acquisition [Line Items]          
Intangible assets 4,100.0        
Dyax | Contract based royalty arrangements          
Business Acquisition [Line Items]          
Intangible assets $ 425.0        
Weighted average amortization period of acquired amortizable intangible assets 8 years        
Dyax | Contract based royalty arrangements | Minimum          
Business Acquisition [Line Items]          
Estimated useful life of intangible assets 7 years        
Dyax | Contract based royalty arrangements | Maximum          
Business Acquisition [Line Items]          
Estimated useful life of intangible assets 9 years