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Business Combinations (Acquisition of Dyax) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 22, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill   $ 17,888.2 $ 4,147.8 $ 2,474.9
Integration and acquisition costs   883.9 $ 39.8 $ 158.8
Dyax        
Business Acquisition [Line Items]        
Purchase price payment per share in cash $ 37.30      
Additional consideration per share $ 4      
Preliminary fair value of identifiable assets acquired and liabilities assumed $ 6,330.0      
Cash payments to acquire business 5,934.0      
Liabilities incurred 396.0      
Contingent consideration, high outcome 646.0      
Revenue since acquisition   77.1    
Goodwill 2,702.1      
Integration and acquisition costs   $ 67.7    
Currently marketed products | Dyax        
Business Acquisition [Line Items]        
Intangible assets 135.0      
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 useful life 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        
Business Acquisition [Line Items]        
Estimated useful life of intangible assets   2 years    
Minimum | Other intangible assets | Dyax        
Business Acquisition [Line Items]        
Estimated useful life of intangible assets 7 years      
Maximum        
Business Acquisition [Line Items]        
Estimated useful life of intangible assets   25 years    
Maximum | Other intangible assets | Dyax        
Business Acquisition [Line Items]        
Estimated useful life of intangible assets 9 years