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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, 2025
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net income $ 105.4 $ 146.4
Add back interest expense, net of tax attributable to assumed conversion of senior convertible notes 2.9 2.9
Net income - diluted $ 108.3 $ 149.3
Net income per common share    
Basic (in USD per share) $ 0.27 $ 0.38
Diluted (in USD per share) $ 0.27 $ 0.36
Basic weighted average shares outstanding (in shares) 391.1 390.2
Diluted weighted average shares outstanding (in shares) 407.5 416.7
Collaborative sales-based milestones    
Net income per common share    
Dilutive potential securities (in shares) 0.0 0.7
RSUs and PSUs    
Net income per common share    
Dilutive potential securities (in shares) 0.7 1.3
Senior convertible notes    
Net income per common share    
Dilutive potential securities (in shares) 15.7 15.7
Warrants    
Net income per common share    
Dilutive potential securities (in shares) 0.0 8.8