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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, 2024   50.3        
Beginning balance at Dec. 31, 2024 $ 1,488.8 $ 0.5 $ 1,149.7 $ 2,066.8 $ (312.3) $ (1,416.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock issued under share-based compensation plans (in shares)   0.3        
Stock issued under share-based compensation plans 1.2   1.2      
Share repurchases for tax withholdings (25.5)   (25.5)      
Repurchases of common stock (801.6)         (801.6)
Stock-based compensation expense 8.8   8.8      
Unrealized (loss) gain on available-for-sale debt securities 48.7       48.7  
Foreign currency translation 18.4       18.4  
Net income 71.5     71.5    
Ending balance (in shares) at Mar. 31, 2025   50.6        
Ending balance at Mar. 31, 2025 $ 810.4 $ 0.5 1,134.2 2,138.3 (245.1) (2,217.5)
Beginning balance (in shares) at Dec. 31, 2025 50.7 50.7        
Beginning balance at Dec. 31, 2025 $ 1,234.5 $ 0.5 1,208.9 2,370.8 (128.1) (2,217.6)
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 1.4   1.4      
Reclassification of liability-classified awards to equity 14.5   14.5      
Share repurchases for tax withholdings (31.1)   (31.1)      
Repurchases of common stock           0.0
Stock-based compensation expense 27.5   27.5      
Unrealized (loss) gain on available-for-sale debt securities (46.5)       (46.5)  
Foreign currency translation (3.7)       (3.7)  
Net income $ 77.7     77.7    
Ending balance (in shares) at Mar. 31, 2026 51.1 51.1        
Ending balance at Mar. 31, 2026 $ 1,274.4 $ 0.5 $ 1,221.3 $ 2,448.5 $ (178.3) $ (2,217.6)