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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Jan. 22, 2021
Jan. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Business Acquisition [Line Items]          
Goodwill     $ 3,891.6   $ 3,892.0
Cash paid, net of cash acquired     $ 0.0 $ 747.4  
Prevail Therapeutics Inc.          
Business Acquisition [Line Items]          
Cash $ 90.5        
Acquired IPR&D 824.0        
Goodwill 126.8        
Deferred tax liabilities (106.0)        
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