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Acquisitions and Other Transactions (Other Transactions) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 02, 2016
USD ($)
Jan. 08, 2016
USD ($)
drugs
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]              
Research and development     $ 199.1   $ 174.8 $ 632.2 $ 512.9
Momenta              
Business Acquisition [Line Items]              
Number of drugs | drugs   6          
Collaborative agreement payment   $ 45.0          
Research and development     $ 9.0     $ 22.3  
Momenta | Subsequent Event              
Business Acquisition [Line Items]              
Development and sales milestone payments $ 25.0            
Momenta | Maximum              
Business Acquisition [Line Items]              
Development and sales milestone payments   $ 200.0          
Other company | Product rights and licenses              
Business Acquisition [Line Items]              
Cash consideration       $ 57.9      
Acquired intangible assets, weighted average useful life, in years       5 years