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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 Loss
Retained Earnings
Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2021   388.0        
Balance at beginning of period at Dec. 31, 2021 $ 2,042.1 $ 0.4 $ 2,108.7 $ 0.5 $ 138.7 $ (206.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (in shares)   1.5        
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.3        
Issuance of common stock for Employee Stock Purchase Plan 22.5   22.5      
Issuance of common stock in connection with achievement of regulatory approval milestone, net of issuance costs (in shares)   2.9        
Issuance of common stock in connection with achievement of regulatory approval milestone, net of issuance costs (0.1)   (189.3)     189.2
Purchases of treasury stock, including excise tax (in shares)   (6.6)        
Purchases of treasury stock (557.7)         (557.7)
Conversions of 2023 Notes (in shares)   0.4        
Conversions of 2023 Notes 17.4   4.2     13.2
Benefit of note hedge upon conversions of 2023 Notes (in shares)   (0.3)        
Benefit of note hedge upon conversions of 2023 Notes 0.0   33.5     (33.5)
Share-based compensation expense 92.5   92.5      
Net income 249.4       249.4  
Other comprehensive loss, net of tax (41.6)     (41.6)    
Balance at end of period (in shares) at Sep. 30, 2022   386.2        
Balance at end of period at Sep. 30, 2022 1,824.5 $ 0.4 2,072.1 (41.1) 388.1 (595.0)
Balance at beginning of period (in shares) at Dec. 31, 2021   388.0        
Balance at beginning of period at Dec. 31, 2021 $ 2,042.1 $ 0.4 2,108.7 0.5 138.7 (206.2)
Balance at end of period (in shares) at Dec. 31, 2022 386.3 386.3        
Balance at end of period at Dec. 31, 2022 $ 2,131.8 $ 0.4 2,258.1 (11.6) 479.9 (595.0)
Balance at beginning of period (in shares) at Jun. 30, 2022   392.6        
Balance at beginning of period at Jun. 30, 2022 2,255.9 $ 0.4 2,028.9 (23.0) 286.9 (37.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock for Employee Stock Purchase Plan (in shares)   0.2        
Issuance of common stock for Employee Stock Purchase Plan 12.4   12.4      
Purchases of treasury stock, including excise tax (in shares)   (6.6)        
Purchases of treasury stock (557.7)         (557.7)
Share-based compensation expense 30.8   30.8      
Net income 101.2       101.2  
Other comprehensive loss, net of tax (18.1)     (18.1)    
Balance at end of period (in shares) at Sep. 30, 2022   386.2        
Balance at end of period at Sep. 30, 2022 $ 1,824.5 $ 0.4 2,072.1 (41.1) 388.1 (595.0)
Balance at beginning of period (in shares) at Dec. 31, 2022 386.3 386.3        
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)        
Benefit of note hedge upon conversions of 2023 Notes 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 loss, net of tax $ (24.0)     (24.0)    
Balance at end of period (in shares) at Sep. 30, 2023 386.4 386.4        
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 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)        
Benefit of note hedge upon conversions of 2023 Notes 0.0   1,296.1     (1,296.1)
Share-based compensation expense 39.0   39.0      
Net income 120.7       120.7  
Other comprehensive loss, net of tax $ (6.3)     (6.3)    
Balance at end of period (in shares) at Sep. 30, 2023 386.4 386.4        
Balance at end of period at Sep. 30, 2023 $ 2,267.9 $ 0.4 $ 3,618.0 $ (35.6) $ 765.1 $ (2,080.0)