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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2023   385.4        
Balance at beginning of period at Dec. 31, 2023 $ 2,068.6 $ 0.4 $ 3,514.6 $ (16.7) $ 1,021.4 $ (2,451.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   1.2        
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 13.4   13.4      
Issuance of common stock in connection with achievement of regulatory approval milestone, net of issuance costs (in shares)   1.5        
Issuance of common stock in connection with achievement of sales-based milestone, net of issuance costs 0.0   (188.1)     188.1
Exercise and settlement of warrants (in shares)   7.9        
Exercise and settlement of warrants 0.0   (868.3)     868.3
Share-based compensation expense 39.0   39.0      
Net income 146.4       146.4  
Other comprehensive income (loss), net of tax (20.6)     (20.6)    
Balance at end of period (in shares) at Mar. 31, 2024   396.1        
Balance at end of period at Mar. 31, 2024 $ 2,246.8 $ 0.4 2,510.6 (37.3) 1,167.8 (1,394.7)
Balance at beginning of period (in shares) at Dec. 31, 2024 390.7 390.7        
Balance at beginning of period at Dec. 31, 2024 $ 2,102.6 $ 0.4 2,093.8 (8.0) 1,597.6 (1,581.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   1.2        
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.2        
Issuance of common stock for Employee Stock Purchase Plan 14.2   14.2      
Share-based compensation expense 34.2   34.2      
Net income 105.4       105.4  
Other comprehensive income (loss), net of tax $ 10.2     10.2    
Balance at end of period (in shares) at Mar. 31, 2025 392.1 392.1        
Balance at end of period at Mar. 31, 2025 $ 2,266.6 $ 0.4 $ 2,142.2 $ 2.2 $ 1,703.0 $ (1,581.2)