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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Paid-in Capital
Retained Earnings
Other
Beginning balance (in shares) at Dec. 31, 2023   46.7      
Beginning balance at Dec. 31, 2023 $ 1,892.1 $ 0.5 $ 696.0 $ 1,195.6 $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 32.6   32.6    
Issuances under equity plans (in shares)   0.5      
Issuances under equity plans 17.2   17.2    
Tax withholding on restricted stock vesting (13.7)   (13.7)    
Stock repurchase and retirement of shares (in shares)   (3.0)      
Stock repurchase and retirement of shares (284.5)   (47.5) (237.0)  
Other (2.1)       (2.1)
Net income 132.8     132.8  
Ending balance (in shares) at Sep. 30, 2024   44.2      
Ending balance at Sep. 30, 2024 1,774.4 $ 0.5 684.6 1,091.4 (2.1)
Beginning balance (in shares) at Jun. 30, 2024   45.1      
Beginning balance at Jun. 30, 2024 1,807.9 $ 0.5 687.2 1,122.5 (2.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 9.9   9.9    
Issuances under equity plans (in shares)   0.1      
Issuances under equity plans 7.7   7.7    
Tax withholding on restricted stock vesting (3.7)   (3.7)    
Stock repurchase and retirement of shares (in shares)   (1.0)      
Stock repurchase and retirement of shares (95.1)   (16.5) (78.6)  
Other 0.2       0.2
Net income 47.5     47.5  
Ending balance (in shares) at Sep. 30, 2024   44.2      
Ending balance at Sep. 30, 2024 1,774.4 $ 0.5 684.6 1,091.4 (2.1)
Beginning balance (in shares) at Dec. 31, 2024   43.8      
Beginning balance at Dec. 31, 2024 1,776.7 $ 0.4 684.2 1,097.1 (5.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 36.8   36.8    
Issuances under equity plans (in shares)   0.5      
Issuances under equity plans 14.2   14.2    
Tax withholding on restricted stock vesting (7.8)   (7.8)    
Stock repurchase and retirement of shares (in shares)   (1.7)      
Stock repurchase and retirement of shares (106.8)   (28.6) (78.2)  
Acquisition (Note 3) (in shares)   0.5      
Acquisition (Note 4) 28.7   28.7    
Other 3.0       3.0
Net income 88.3     88.3  
Ending balance (in shares) at Sep. 30, 2025   43.1      
Ending balance at Sep. 30, 2025 1,833.1 $ 0.4 727.5 1,107.2 (2.0)
Beginning balance (in shares) at Jun. 30, 2025   43.8      
Beginning balance at Jun. 30, 2025 1,826.8 $ 0.4 727.1 1,100.9 (1.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 11.1   11.1    
Issuances under equity plans (in shares)   0.3      
Issuances under equity plans 5.5   5.5    
Tax withholding on restricted stock vesting (0.8)   (0.8)    
Stock repurchase and retirement of shares (in shares)   (1.0)      
Stock repurchase and retirement of shares (47.2)   (15.4) (31.8)  
Other (0.4)       (0.4)
Net income 38.1     38.1  
Ending balance (in shares) at Sep. 30, 2025   43.1      
Ending balance at Sep. 30, 2025 $ 1,833.1 $ 0.4 $ 727.5 $ 1,107.2 $ (2.0)