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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 22.7   22.7    
Issuances under equity plans (in shares)   0.4      
Issuances under equity plans 9.5   9.5    
Tax withholding on restricted stock vesting (10.0)   (10.0)    
Stock repurchase and retirement of shares (in shares)   (2.0)      
Stock repurchase and retirement of shares (189.4)   (31.0) (158.4)  
Other (2.3)       (2.3)
Net income 85.3     85.3  
Ending balance (in shares) at Jun. 30, 2024   45.1      
Ending balance at Jun. 30, 2024 1,807.9 $ 0.5 687.2 1,122.5 (2.3)
Beginning balance (in shares) at Mar. 31, 2024   46.2      
Beginning balance at Mar. 31, 2024 1,861.4 $ 0.5 695.7 1,165.4 (0.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 11.0   11.0    
Tax withholding on restricted stock vesting (1.5)   (1.5)    
Stock repurchase and retirement of shares (in shares)   (1.1)      
Stock repurchase and retirement of shares (108.1)   (18.0) (90.1)  
Other (2.1)       (2.1)
Net income 47.2     47.2  
Ending balance (in shares) at Jun. 30, 2024   45.1      
Ending balance at Jun. 30, 2024 1,807.9 $ 0.5 687.2 1,122.5 (2.3)
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 25.7   25.7    
Issuances under equity plans (in shares)   0.2      
Issuances under equity plans 8.7   8.7    
Tax withholding on restricted stock vesting (7.0)   (7.0)    
Stock repurchase and retirement of shares (in shares)   (0.7)      
Stock repurchase and retirement of shares (59.6)   (13.2) (46.4)  
Acquisition (Note 3) (in shares)   0.5      
Acquisition (Note 3) 28.7   28.7    
Other 3.4       3.4
Net income 50.2     50.2  
Ending balance (in shares) at Jun. 30, 2025   43.8      
Ending balance at Jun. 30, 2025 1,826.8 $ 0.4 727.1 1,100.9 (1.6)
Beginning balance (in shares) at Mar. 31, 2025   43.9      
Beginning balance at Mar. 31, 2025 1,793.3 $ 0.4 719.0 1,078.1 (4.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 11.9   11.9    
Tax withholding on restricted stock vesting (1.2)   (1.2)    
Stock repurchase and retirement of shares (in shares)   (0.1)      
Stock repurchase and retirement of shares (9.1)   (2.6) (6.5)  
Other 2.6       2.6
Net income 29.3     29.3  
Ending balance (in shares) at Jun. 30, 2025   43.8      
Ending balance at Jun. 30, 2025 $ 1,826.8 $ 0.4 $ 727.1 $ 1,100.9 $ (1.6)