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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 20, 2020
Mar. 31, 2020
Feb. 28, 2019
Mar. 31, 2020
Mar. 31, 2019
Feb. 29, 2020
Dec. 31, 2019
Feb. 15, 2019
Business Acquisition [Line Items]                
Acquired IPR&D charges       $ 52.3 $ 136.9      
Goodwill   $ 3,779.1   3,779.1     $ 3,679.4  
Repayments of long-term debt       276.3 $ 600.0      
Dermira                
Business Acquisition [Line Items]                
Purchase price $ 849.3              
Goodwill           $ 99.7    
Acquired other intangibles           1,210.0    
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
AbCellera                
Business Acquisition [Line Items]                
Research and development arrangement, upfront fee   $ 25.0   $ 25.0