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Acquisitions (narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 03, 2017
Mar. 31, 2017
Jan. 31, 2017
Jan. 31, 2015
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
Jan. 01, 2015
Dec. 31, 2014
Business Acquisition [Line Items]                                  
Acquired in-process research and development         $ 50.0 $ 205.0 $ 0.0 $ 857.6 $ 30.0 $ 0.0 $ 0.0 $ 0.0 $ 1,112.6 $ 30.0 $ 535.0    
Restricted cash                                 $ 5,410.0
Boehringer                                  
Business Acquisition [Line Items]                                  
Consideration transferred $ 882.1                                
Intangibles acquired, weighted average useful life (in years)     10 years                            
Revenue                         216.7        
Novartis Animal Health                                  
Business Acquisition [Line Items]                                  
Consideration transferred       $ 5,280.0                          
Intangibles acquired, weighted average useful life (in years)       19 years                          
Goodwill recognized                               $ 1,000.0  
CoLucid Pharmaceuticals, Inc. (CoLucid)                                  
Business Acquisition [Line Items]                                  
Purchased in-process research and development   $ 831.8                              
Acquired in-process research and development                         857.6        
Accrued liabilities acquired   $ 25.8                              
KeyBioscience AG (KeyBioscience)                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                         55.0        
Nektar Therapeutics (Nektar)                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                         150.0        
CureVac AG (CureVac)                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                         $ 50.0        
AstraZeneca                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                           $ 30.0      
Innovent Biologics, Inc. (Innovent)                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                             56.0    
Hanmi Pharmaceutical Co., Ltd. (Hanmi)                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                             50.0    
BioNTech AG (BioNTech)                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                             30.0    
Locemia Solutions                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                             149.0    
Undisclosed                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                             25.0    
Halozyme Therapeutics, Inc. (Halozyme)                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                             25.0    
Tanezumab                                  
Business Acquisition [Line Items]                                  
Acquired in-process research and development                             $ 200.0    
United States | U.S. Sentinel Product Line                                  
Business Acquisition [Line Items]                                  
Proceeds from divestiture of businesses       $ 410.0