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Acquisitions (Narrative) (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 01, 2022
USD ($)
Dec. 31, 2022
USD ($)
right
$ / shares
Feb. 28, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Business Acquisition [Line Items]                
Acquired in-process research and development (Note 3)         $ 97.1 $ 440.4 $ 202.1 $ 606.0
Acquired IPR&D           $ 333.8   $ 333.8
BioMarin Pharmaceutical Inc                
Business Acquisition [Line Items]                
Acquired IPR&D     $ 110.0          
Akouos Acquisition                
Business Acquisition [Line Items]                
Business acquisition, share price (in dollars per share) | $ / shares   $ 12.50            
Cash paid, net of cash acquired $ 327.2 $ 327.2            
Consideration transferred, number of contingent value rights | right   1,000,000            
Contingent value right, additional price per share (up to) (in dollars per share) | $ / shares   $ 3,000,000.00            
Contingent value right, additional price per share, aggregate amount   $ 122.0            
DICE Therapeutics, Inc | Forecast                
Business Acquisition [Line Items]                
Business acquisition, share price (in dollars per share) | $ / shares       $ 48        
Payments to acquire businesses       $ 2,400.0        
Other Pending Acquisitions                
Business Acquisition [Line Items]                
Payments to acquire businesses             $ 1,000.0