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Organization and Significant Accounting Policies - Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net income $ 146.4 $ 48.6
Add back interest expense, net of tax attributable to assumed conversion of senior convertible notes 2.9 1.6
Net income - diluted $ 149.3 $ 50.2
Net income per common share    
Basic net income per share (in USD per share) $ 0.38 $ 0.13
Diluted net income per share (in USD per share) $ 0.36 $ 0.12
Basic weighted average shares outstanding (in shares) 390.2 386.7
Diluted weighted average shares outstanding (in shares) 416.7 418.5
Collaborative Sales-based Milestone    
Net income per common share    
Dilutive potential common stock outstanding (in shares) 0.7 0.0
RSUs and PSUs    
Net income per common share    
Dilutive potential common stock outstanding (in shares) 1.3 1.3
Senior convertible notes    
Net income per common share    
Dilutive potential common stock outstanding (in shares) 15.7 18.9
Warrants    
Net income per common share    
Dilutive potential common stock outstanding (in shares) 8.8 11.6