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Business Combinations (Acquisition of Dyax) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jan. 22, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                        
Revenues   $ 4,144.9 $ 3,697.6 $ 3,745.8 $ 3,572.3 $ 3,806.1 $ 3,452.1 $ 2,429.1 $ 1,709.3 $ 15,160.6 $ 11,396.6 $ 6,416.7
Goodwill   $ 19,831.7       $ 17,888.2       $ 19,831.7 17,888.2 $ 4,147.8
Minimum                        
Business Acquisition [Line Items]                        
Estimated useful life of intangible assets                   1 year    
Maximum                        
Business Acquisition [Line Items]                        
Estimated useful life of intangible assets                   24 years    
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                      
Revenues                     $ 77.1  
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