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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
Common Stock, Shares   52.9      
Total stockholders’ equity at Dec. 31, 2019 $ 1,376.2 $ 0.5 $ 638.0 $ 744.7 $ (7.0)
Employee stock purchase plan, shares   0.4      
Employee stock purchase plan, value 5.9   5.9    
Stock-based compensation expense 17.1   17.1    
Stock Repurchased and Retired During Period, Shares   (0.8)      
Stock Repurchased and Retired During Period, Value (27.9)   (9.2) (18.7)  
Foreign currency translation adjustments (0.9)       (0.9)
Net income 92.6     92.6  
Shares Outstanding at Jun. 30, 2020   52.5      
Total stockholders’ equity at Jun. 30, 2020 1,457.1 $ 0.5 645.9 818.6 (7.9)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation (5.9)   (5.9)    
Vesting of restricted stock units, shares   0.0      
Common Stock, Shares   52.4      
Total stockholders’ equity at Mar. 31, 2020 1,399.5 $ 0.5 638.7 769.8 (9.5)
Employee stock purchase plan, shares   0.1      
Employee stock purchase plan, value 0.0   0.0    
Stock-based compensation expense 8.2   8.2    
Foreign currency translation adjustments 1.6       1.6
Net income 48.8     48.8  
Shares Outstanding at Jun. 30, 2020   52.5      
Total stockholders’ equity at Jun. 30, 2020 1,457.1 $ 0.5 645.9 818.6 (7.9)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation (1.0)   (1.0)    
Vesting of restricted stock units, shares   0.0      
Total stockholders’ equity at Dec. 31, 2020 1,587.1 $ 0.5 661.3 926.3 (1.0)
Employee stock purchase plan, shares   0.3      
Employee stock purchase plan, value 7.7   7.7    
Stock-based compensation expense 21.1   21.1    
Foreign currency translation adjustments (1.9)       (1.9)
Net income 112.9     112.9  
Shares Outstanding at Jun. 30, 2021   53.2      
Total stockholders’ equity at Jun. 30, 2021 1,719.8 $ 0.5 683.0 1,039.2 (2.9)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation (7.1)   (7.1)    
Vesting of restricted stock units, shares   0.0      
Common Stock, Shares   53.2      
Total stockholders’ equity at Mar. 31, 2021 1,645.8 $ 0.5 674.5 975.0 (4.2)
Stock-based compensation expense 10.8   10.8    
Foreign currency translation adjustments 1.3       1.3
Net income 64.2     64.2  
Shares Outstanding at Jun. 30, 2021   53.2      
Total stockholders’ equity at Jun. 30, 2021 1,719.8 $ 0.5 683.0 $ 1,039.2 $ (2.9)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation $ (2.3)   $ (2.3)    
Vesting of restricted stock units, shares   0.0