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Acquisitions and Divestiture (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
medicine
Feb. 28, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Business Acquisition [Line Items]              
Acquired in-process research and development       $ 25.0 $ 1,624.5 $ 161.9 $ 1,624.5
Loxo Oncology, Inc.              
Business Acquisition [Line Items]              
Purchase price     $ 6,920.0        
Centrexion Therapeutics Corporation | CNTX-0290 | Subsequent Event              
Business Acquisition [Line Items]              
Acquired in-process research and development $ 47.5            
License and research collaboration agreement, upfront fee $ 47.5            
Legacy Antibiotic Medicines and Manufacturing Facility in Suzhou, China | Disposal Group, Held-for-sale, Not Discontinued Operations | Eddingpharm              
Business Acquisition [Line Items]              
Number of medicines, rights to, agreed to be sold | medicine   2          
Disposal group, not discontinued operation, deposit to be received   $ 75.0          
Disposal group, not discontinued operation, payment to be received   $ 300.0