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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($)
shares in Thousands, $ in Millions
Total
Common Stock
Additional Paid-in Capital
Accumulated Earnings
Accumulated Other Comprehensive (Loss) Income
Treasury Stock
Deferred Compensation
Beginning balance (in shares) at Dec. 31, 2023   69,907          
Balance at beginning of period at Dec. 31, 2023 $ 732.7 $ 0.1 $ 1,102.7 $ (378.0) $ 8.0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 317.6     317.6      
Other comprehensive income (loss), net of tax 11.7       11.7    
Exercise of options to purchase common stock (in shares)   117          
Exercise of options to purchase common stock 7.7   7.7        
Issuance of shares for employee stock purchase plan (in shares)   40          
Issuance of shares for employee stock purchase plan 6.0   6.0        
Stock-based compensation expense 49.3   49.3        
Restricted stock units vested, net of shares withheld for taxes (in shares)   78          
Restricted stock units vested, net of shares withheld for taxes (7.0)   (7.0)        
Ending balance (in shares) at Sep. 30, 2024   70,142          
Balance at the end of period at Sep. 30, 2024 1,118.0 $ 0.1 1,158.7 (60.4) 19.7    
Beginning balance (in shares) at Jun. 30, 2024   70,112          
Balance at beginning of period at Jun. 30, 2024 998.4 $ 0.1 1,140.6 (137.9) (4.4)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 77.5     77.5      
Other comprehensive income (loss), net of tax 24.1       24.1    
Exercise of options to purchase common stock (in shares)   20          
Exercise of options to purchase common stock 0.7   0.7        
Stock-based compensation expense 18.2   18.2        
Restricted stock units vested, net of shares withheld for taxes (in shares)   9          
Restricted stock units vested, net of shares withheld for taxes (0.9)   (0.9)        
Ending balance (in shares) at Sep. 30, 2024   70,142          
Balance at the end of period at Sep. 30, 2024 1,118.0 $ 0.1 1,158.7 (60.4) 19.7    
Beginning balance (in shares) at Dec. 31, 2024   70,196          
Balance at beginning of period at Dec. 31, 2024 1,211.6 $ 0.1 1,184.4 40.3 (13.2) $ 0.0 $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 145.5     145.5      
Other comprehensive income (loss), net of tax 25.3       25.3    
Exercise of options to purchase common stock (in shares)   141          
Exercise of options to purchase common stock 17.2   17.2        
Issuance of shares for employee stock purchase plan (in shares)   31          
Issuance of shares for employee stock purchase plan 7.1   7.1        
Stock-based compensation expense 42.4   42.4        
Restricted stock units vested, net of shares withheld for taxes (in shares)   162          
Restricted stock units vested, net of shares withheld for taxes $ (25.1)   (25.1)        
Repurchase of common stock (in shares) (184) (184)          
Repurchase of common stock $ (59.6)         (59.6)  
Conversion of Convertible Senior Notes (144.8)   (144.8)        
Deferred compensation 0.0         (0.9) 0.9
Settlement of capped call options 164.6   164.6        
Ending balance (in shares) at Sep. 30, 2025   70,346          
Balance at the end of period at Sep. 30, 2025 1,384.1 $ 0.1 1,245.8 185.8 12.2 (60.5) 0.9
Beginning balance (in shares) at Jun. 30, 2025   70,391          
Balance at beginning of period at Jun. 30, 2025 1,462.9 $ 0.1 1,379.4 98.2 15.4 (31.0) 0.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 87.6     87.6      
Other comprehensive income (loss), net of tax (3.2)       (3.2)    
Exercise of options to purchase common stock (in shares)   32          
Exercise of options to purchase common stock 4.6   4.6        
Stock-based compensation expense 16.7   16.7        
Restricted stock units vested, net of shares withheld for taxes (in shares)   14          
Restricted stock units vested, net of shares withheld for taxes $ (2.3)   (2.3)        
Repurchase of common stock (in shares) (91) (91)          
Repurchase of common stock $ (29.6)         (29.6)  
Conversion of Convertible Senior Notes (144.8)   (144.8)        
Settlement of capped call options (7.8)   (7.8)        
Ending balance (in shares) at Sep. 30, 2025   70,346          
Balance at the end of period at Sep. 30, 2025 $ 1,384.1 $ 0.1 $ 1,245.8 $ 185.8 $ 12.2 $ (60.5) $ 0.9