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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 01, 2022
Jan. 22, 2021
Dec. 31, 2022
Jan. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]              
Goodwill     $ 4,073.0   $ 4,073.0 $ 3,892.0  
Cash paid, net of cash acquired         $ 327.2 $ 747.4 $ 849.3
Akouos Acquisition              
Business Acquisition [Line Items]              
Cash $ 153.2            
Acquired IPR&D 184.0            
Goodwill 181.2            
Other assets and liabilities, net 28.9            
Acquisition date fair value of consideration transferred 547.3            
Cash acquired (153.2)            
Fair value of CVR liability $ (66.9)            
Cash paid, net of cash acquired     $ 327.2        
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   $ 747.4