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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Feb. 15, 2019
Business Acquisition [Line Items]                
Acquired IPR&D charges     $ 241.8 $ 25.0 $ 294.1 $ 161.9    
Goodwill     $ 3,723.2   3,723.2   $ 3,679.4  
Repayments of long-term debt         276.3 $ 600.2    
Dermira                
Business Acquisition [Line Items]                
Purchase price $ 849.3              
Goodwill 43.7              
Acquired other intangibles 1,240.0              
Deferred income taxes assumed 51.2              
Long-term debt assumed $ 375.5              
Repayments of long-term debt         $ 276.2      
Loxo Oncology, Inc.                
Business Acquisition [Line Items]                
Purchase price   $ 6,920.0            
Goodwill               $ 2,326.9
Deferred income taxes assumed               $ 1,032.8