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Acquisitions Acquisitions (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Feb. 12, 2015
Business Acquisition [Line Items]            
Contingent consideration   $ 36.0 $ 0.0 $ 274.5 $ 0.0  
Convergence Pharmaceuticals            
Business Acquisition [Line Items]            
Cash portion of consideration $ 200.1          
Potential future milestone payments           $ 450.0
Contingent consideration $ 274.5          
Increase in the value of our estimated contingent consideration   36.0        
Increase in goodwill   $ 36.0        
Discount rate 2.00%          
In-process research and development and other intangible assets           424.6
Convergence Pharmaceuticals | CNV1014802            
Business Acquisition [Line Items]            
Potential future milestone payments           350.0
Discount rate 11.00%          
Remaining cost to complete CNV1014802           145.0
In-process research and development and other intangible assets           200.0
Convergence Pharmaceuticals | Neuropathic pain indications            
Business Acquisition [Line Items]            
Remaining cost to complete CNV1014802           415.0
In-process research and development and other intangible assets           $ 220.0