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Commitments and Contingences (Details) - Fumapharm AG - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2006
Jun. 30, 2013
Business Acquisition, Contingent Consideration [Line Items]      
Cash portion of consideration   $ 220.0  
TECFIDERA      
Business Acquisition, Contingent Consideration [Line Items]      
Maximum contingent consideration in the form of development and approval milestones     $ 15.0
Four billion      
Business Acquisition, Contingent Consideration [Line Items]      
Cash portion of consideration $ 250.0    
Cumulative sales level 4,000.0    
Five billion      
Business Acquisition, Contingent Consideration [Line Items]      
Cash portion of consideration 300.0    
Cumulative sales level 5,000.0    
Each additional one billion up to twenty billion      
Business Acquisition, Contingent Consideration [Line Items]      
Cumulative sales level 20,000.0    
One billion      
Business Acquisition, Contingent Consideration [Line Items]      
Cumulative sales level 1,000.0    
Three billion      
Business Acquisition, Contingent Consideration [Line Items]      
Cumulative sales level $ 3,000.0