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Collaborative and Other Relationships Collaborative and Other Relationships - Equity Method Investments (Details)
$ in Millions, ₩ in Billions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2012
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Feb. 29, 2012
KRW (₩)
Schedule of Equity Method Investments [Line Items]              
Recognized loss   $ 0.0 $ (6.8)   $ 0.0 $ (12.5)  
Research and development   529.0 519.9   1,439.4 1,471.1  
Collaboration profit (loss) sharing   4.7 0.0   (0.9) 0.0  
Revenue related to technical development and technology transfer services   $ 98.6 49.0   $ 265.5 156.6  
Samsung Biosimilar Agreement [Member]              
Schedule of Equity Method Investments [Line Items]              
Contribution from Samsung to develop, manufacture and market biosimilar pharmaceuticals $ 250.0           ₩ 280.5
Variable interest entity, qualitative or quantitative information, ownership percentage 85.00%            
Contribution from Biogen to develop, manufacture and market biosimilar pharmaceuticals $ 45.0           ₩ 49.5
Percentage of stake in entity minimum 15.00% 9.00%     9.00%   15.00%
Percentage of stake in entity maximum 49.90%            
Recognized loss     (6.8)     (12.5)  
Research and development       $ 46.0      
Expected profit share with Samsung Bioepis         50.00%    
Revenue related to technical development and technology transfer services   $ 0.4 $ 10.9   $ 17.3 $ 47.0  
Acquired and in-licensed rights and patents | Biosimilars              
Schedule of Equity Method Investments [Line Items]              
Increase in acquired and in-licensed rights and patents   25.0     50.0    
Samsung Biosimilar Agreement [Member]              
Schedule of Equity Method Investments [Line Items]              
Collaboration profit (loss) sharing   $ 7.4     $ 1.8