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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, 2022   386.3        
Balance at beginning of period at Dec. 31, 2022 $ 2,131.8 $ 0.4 $ 2,258.1 $ (11.6) $ 479.9 $ (595.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   1.3        
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.3        
Issuance of common stock for Employee Stock Purchase Plan 26.6   26.6      
Purchases of treasury stock, including excise tax (in shares)   (1.6)        
Purchases of treasury stock, including excise tax (188.9)         (188.9)
Conversions of 2023 Notes (in shares)   10.6        
Conversions of 2023 Notes (0.4)   (0.4)      
Benefit of note hedge upon conversions of 2023 Notes (in shares)   (10.5)        
Exercise and settlement of warrants 0.0   1,296.1     (1,296.1)
Purchase of capped call transactions, net of tax (76.3)   (76.3)      
Share-based compensation expense 113.9   113.9      
Net income 285.2       285.2  
Other comprehensive income (loss), net of tax (24.0)     (24.0)    
Balance at end of period (in shares) at Sep. 30, 2023   386.4        
Balance at end of period at Sep. 30, 2023 2,267.9 $ 0.4 3,618.0 (35.6) 765.1 (2,080.0)
Balance at beginning of period (in shares) at Dec. 31, 2022   386.3        
Balance at beginning of period at Dec. 31, 2022 $ 2,131.8 $ 0.4 2,258.1 (11.6) 479.9 (595.0)
Balance at end of period (in shares) at Dec. 31, 2023 385.4 385.4        
Balance at end of period at Dec. 31, 2023 $ 2,068.6 $ 0.4 3,514.6 (16.7) 1,021.4 (2,451.1)
Balance at beginning of period (in shares) at Jun. 30, 2023   386.1        
Balance at beginning of period at Jun. 30, 2023 2,100.4 $ 0.4 2,269.0 (29.3) 644.4 (784.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.1        
Issuance of common stock for Employee Stock Purchase Plan 14.3   14.3      
Purchases of treasury stock, including excise tax 0.2         0.2
Conversions of 2023 Notes (in shares)   10.6        
Conversions of 2023 Notes (0.4)   (0.4)      
Benefit of note hedge upon conversions of 2023 Notes (in shares)   (10.5)        
Exercise and settlement of warrants 0.0   1,296.1     (1,296.1)
Share-based compensation expense 39.0   39.0      
Net income 120.7       120.7  
Other comprehensive income (loss), net of tax (6.3)     (6.3)    
Balance at end of period (in shares) at Sep. 30, 2023   386.4        
Balance at end of period at Sep. 30, 2023 $ 2,267.9 $ 0.4 3,618.0 (35.6) 765.1 (2,080.0)
Balance at end of period (in shares) at Dec. 31, 2023 385.4 385.4        
Balance at end 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)   0.4        
Issuance of common stock for Employee Stock Purchase Plan 28.2   28.2      
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)   12.5        
Exercise and settlement of warrants 0.0   (1,431.3)     1,431.3
Purchases of treasury stock, including excise tax (in shares)   (10.4)        
Purchases of treasury stock, including excise tax (749.5)         (749.5)
Share-based compensation expense 127.1   127.1      
Net income 424.5       424.5  
Other comprehensive income (loss), net of tax $ 80.1     80.1    
Balance at end of period (in shares) at Sep. 30, 2024 390.6 390.6        
Balance at end of period at Sep. 30, 2024 $ 1,979.0 $ 0.4 2,050.5 63.4 1,445.9 (1,581.2)
Balance at beginning of period (in shares) at Jun. 30, 2024   400.7        
Balance at beginning of period at Jun. 30, 2024 2,434.3 $ 0.4 1,992.3 (38.0) 1,311.3 (831.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.3        
Issuance of common stock for Employee Stock Purchase Plan 14.8   14.8      
Purchases of treasury stock, including excise tax (in shares)   (10.4)        
Purchases of treasury stock, including excise tax (749.5)         (749.5)
Share-based compensation expense 43.4   43.4      
Net income 134.6       134.6  
Other comprehensive income (loss), net of tax $ 101.4     101.4    
Balance at end of period (in shares) at Sep. 30, 2024 390.6 390.6        
Balance at end of period at Sep. 30, 2024 $ 1,979.0 $ 0.4 $ 2,050.5 $ 63.4 $ 1,445.9 $ (1,581.2)