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Acquisitions and Divestiture (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
Feb. 15, 2019
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 3,855.9 $ 1,366.6
Loxo Oncology, Inc.      
Business Acquisition [Line Items]      
Acquired in-process research and development $ 4,670.0    
Deferred income taxes (1,170.2)    
Other assets and liabilities - net (31.4)    
Total identifiable net assets 4,428.4    
Goodwill 2,489.3    
Total consideration transferred - net of cash acquired 6,917.7    
Contract-Based Intangible Assets | Loxo Oncology, Inc.      
Business Acquisition [Line Items]      
Definite-lived intangibles $ 960.0    
Useful life 12 years