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Acquisitions (Acquisition-Related Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 02, 2020
Jan. 28, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]            
Transaction costs     $ 1.8 $ 0.0 $ 7.4 $ 0.0
Integration costs     4.6 0.0 5.6 0.0
Fair value of equity compensation attributable to the post-combination service period     11.1 0.0 36.8 0.0
Restructuring-related costs     45.5 0.0 55.9 0.0
Acquisition-related costs     63.0 $ 0.0 105.7 $ 0.0
Achillion            
Business Acquisition [Line Items]            
Fair value of equity compensation attributable to the post-combination service period   $ 20.0     25.7  
Acquisition-related costs         38.0  
Portola Pharmaceuticals, Inc.            
Business Acquisition [Line Items]            
Fair value of equity compensation attributable to the post-combination service period $ 11.1          
Acquisition-related costs     $ 63.0   $ 67.7