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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Business Acquisition [Line Items]        
Goodwill   $ 3,877.4   $ 3,766.5
Cash paid, net of cash acquired   $ 747.4 $ 849.3  
Prevail Therapeutics Inc.        
Business Acquisition [Line Items]        
Cash $ 90.5      
Acquired IPR&D 834.0      
Goodwill 111.0      
Deferred tax liabilities (100.2)      
Other assets and liabilities, net (31.5)      
Acquisition date fair value of consideration transferred 903.8      
Cash acquired (90.5)      
Fair value of CVR liability (65.9)      
Cash paid, net of cash acquired $ 747.4