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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (unaudited) - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Retained Earnings (Accumulated Deficit)
Beginning balance (in shares) at Dec. 31, 2023   98,700,000      
Beginning balance at Dec. 31, 2023 $ 2,232.0 $ 0.1 $ 2,382.0 $ 7.0 $ (157.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 238.2       238.2
Other comprehensive income, net of tax 7.5     7.5  
Stock-based compensation expense 129.1   129.1    
Issuances of common stock under stock plans (in shares)   2,500,000      
Issuances of common stock under stock plans $ 112.1   112.1    
Repurchases of common stock (in shares) 0        
Ending balance (in shares) at Sep. 30, 2024   101,200,000      
Ending balance at Sep. 30, 2024 $ 2,718.9 $ 0.1 2,623.2 14.5 81.1
Beginning balance (in shares) at Jun. 30, 2024   100,900,000      
Beginning balance at Jun. 30, 2024 2,509.2 $ 0.1 2,555.3 2.5 (48.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 129.8       129.8
Other comprehensive income, net of tax 12.0     12.0  
Stock-based compensation expense 41.5   41.5    
Issuances of common stock under stock plans (in shares)   300,000      
Issuances of common stock under stock plans $ 26.4   26.4    
Repurchases of common stock (in shares) 0        
Ending balance (in shares) at Sep. 30, 2024   101,200,000      
Ending balance at Sep. 30, 2024 $ 2,718.9 $ 0.1 2,623.2 14.5 81.1
Beginning balance (in shares) at Dec. 31, 2024   99,400,000      
Beginning balance at Dec. 31, 2024 2,589.7 $ 0.1 2,554.6 5.8 29.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 324.9       324.9
Other comprehensive income, net of tax 7.4     7.4  
Stock-based compensation expense 159.3   159.3    
Issuances of common stock under stock plans (in shares)   2,100,000      
Issuances of common stock under stock plans $ 90.0   90.0    
Repurchases of common stock (in shares) (1,800,000) (1,800,000)      
Repurchases of common stock $ (167.7)   (107.6)   (60.1)
Ending balance (in shares) at Sep. 30, 2025   99,700,000      
Ending balance at Sep. 30, 2025 3,003.6 $ 0.1 2,696.3 13.2 294.0
Beginning balance (in shares) at Jun. 30, 2025   99,000,000.0      
Beginning balance at Jun. 30, 2025 2,694.3 $ 0.1 2,597.2 12.5 84.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 209.5       209.5
Other comprehensive income, net of tax 0.7     0.7  
Stock-based compensation expense 53.7   53.7    
Issuances of common stock under stock plans (in shares)   700,000      
Issuances of common stock under stock plans $ 45.4   45.4    
Repurchases of common stock (in shares) 0        
Ending balance (in shares) at Sep. 30, 2025   99,700,000      
Ending balance at Sep. 30, 2025 $ 3,003.6 $ 0.1 $ 2,696.3 $ 13.2 $ 294.0