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Condensed Consolidated Statements of Stockholders’ Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock Issued
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2022   49.6        
Beginning balance at Dec. 31, 2022 $ 1,649.5 $ 0.5 $ 928.0 $ 1,490.5 $ (306.3) $ (463.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock issued under share-based compensation plans (in shares)   0.1        
Stock issued under share-based compensation plans 6.3   6.3      
Share repurchases for tax withholdings (8.8)   (8.8)      
Purchase of shares of treasury stock (92.8)         (92.8)
Stock-based compensation expense 25.3   25.3      
Unrealized (loss) gain on available-for-sale debt securities 22.2       22.2  
Foreign currency translation 0.8       0.8  
Net income 68.0     68.0    
Ending balance (in shares) at Mar. 31, 2023   49.7        
Ending balance at Mar. 31, 2023 1,670.5 $ 0.5 950.8 1,558.5 (283.3) (556.0)
Beginning balance (in shares) at Dec. 31, 2022   49.6        
Beginning balance at Dec. 31, 2022 1,649.5 $ 0.5 928.0 1,490.5 (306.3) (463.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Purchase of shares of treasury stock (96.0)          
Foreign currency translation 6.3          
Net income 163.3          
Ending balance (in shares) at Jun. 30, 2023   49.8        
Ending balance at Jun. 30, 2023 1,768.7 $ 0.5 981.3 1,653.8 (307.7) (559.2)
Beginning balance (in shares) at Mar. 31, 2023   49.7        
Beginning balance at Mar. 31, 2023 1,670.5 $ 0.5 950.8 1,558.5 (283.3) (556.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock issued under share-based compensation plans (in shares)   0.1        
Stock issued under share-based compensation plans 1.2   1.2      
Share repurchases for tax withholdings (6.6)   (6.6)      
Purchase of shares of treasury stock (3.2)         (3.2)
Stock-based compensation expense 35.9   35.9      
Unrealized (loss) gain on available-for-sale debt securities (29.9)       (29.9)  
Foreign currency translation 5.5       5.5  
Net income 95.3     95.3    
Ending balance (in shares) at Jun. 30, 2023   49.8        
Ending balance at Jun. 30, 2023 $ 1,768.7 $ 0.5 981.3 1,653.8 (307.7) (559.2)
Beginning balance (in shares) at Dec. 31, 2023 49.9 49.9        
Beginning balance at Dec. 31, 2023 $ 1,820.6 $ 0.5 1,053.0 1,757.1 (229.2) (760.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock issued under share-based compensation plans (in shares)   0.4        
Stock issued under share-based compensation plans 12.3   12.3      
Share repurchases for tax withholdings (28.2)   (28.2)      
Purchase of shares of treasury stock (73.6)         (73.6)
Stock-based compensation expense 28.1   28.1      
Unrealized (loss) gain on available-for-sale debt securities (25.7)       (25.7)  
Foreign currency translation (21.6)       (21.6)  
Net income 65.8     65.8    
Ending balance (in shares) at Mar. 31, 2024   50.3        
Ending balance at Mar. 31, 2024 $ 1,777.7 $ 0.5 1,065.2 1,822.9 (276.5) (834.4)
Beginning balance (in shares) at Dec. 31, 2023 49.9 49.9        
Beginning balance at Dec. 31, 2023 $ 1,820.6 $ 0.5 1,053.0 1,757.1 (229.2) (760.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Purchase of shares of treasury stock (174.4)          
Foreign currency translation (16.8)          
Net income $ 142.7          
Ending balance (in shares) at Jun. 30, 2024 50.3 50.3        
Ending balance at Jun. 30, 2024 $ 1,783.5 $ 0.5 1,099.6 1,899.9 (281.2) (935.3)
Beginning balance (in shares) at Mar. 31, 2024   50.3        
Beginning balance at Mar. 31, 2024 1,777.7 $ 0.5 1,065.2 1,822.9 (276.5) (834.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock issued under share-based compensation plans 2.6   2.6      
Share repurchases for tax withholdings (1.6)   (1.6)      
Purchase of shares of treasury stock (100.8)         (100.8)
Stock-based compensation expense 33.4   33.4      
Unrealized (loss) gain on available-for-sale debt securities (9.5)       (9.5)  
Foreign currency translation 4.8       4.8  
Net income $ 77.0     77.0    
Ending balance (in shares) at Jun. 30, 2024 50.3 50.3        
Ending balance at Jun. 30, 2024 $ 1,783.5 $ 0.5 $ 1,099.6 $ 1,899.9 $ (281.2) $ (935.3)