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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
Accumulated Other Comprehensive Income (Loss)
Shares Outstanding at Dec. 31, 2017   52.2      
Total stockholders’ equity at Dec. 31, 2017 $ 991.4 $ 0.5 $ 566.1 $ 428.4 $ (3.6)
Vesting of restricted stock units, value (2.2)   (2.2)    
Employee stock purchase plan, shares   0.1      
Employee stock purchase plan, value 4.3   4.3    
Exercise of stock options, value 0.1   0.1    
Stock-based compensation expense 13.6   13.6    
Translation adjustments (1.2)       (1.2)
Net income 62.7     62.7  
Shares Outstanding at Jun. 30, 2018   52.3      
Total stockholders’ equity at Jun. 30, 2018 1,068.7 $ 0.5 581.9 491.1 (4.8)
Shares Outstanding at Mar. 31, 2018   52.3      
Total stockholders’ equity at Mar. 31, 2018 1,030.3 $ 0.5 574.4 457.5 (2.1)
Vesting of restricted stock units, value (1.2)   (1.2)    
Stock-based compensation expense 8.7   8.7    
Translation adjustments (2.7)       (2.7)
Net income 33.6     33.6  
Shares Outstanding at Jun. 30, 2018   52.3      
Total stockholders’ equity at Jun. 30, 2018 1,068.7 $ 0.5 581.9 491.1 (4.8)
Shares Outstanding at Dec. 31, 2018   52.5      
Total stockholders’ equity at Dec. 31, 2018 1,182.1 $ 0.5 601.8 586.1 (6.3)
Vesting of restricted stock units, shares   0.2      
Vesting of restricted stock units, value (6.8)   (6.8)    
Employee stock purchase plan, shares   0.1      
Employee stock purchase plan, value 6.9   6.9    
Stock-based compensation expense 23.6   23.6    
Translation adjustments (0.1)       (0.1)
Net income 78.0     78.0  
Shares Outstanding at Jun. 30, 2019   52.8      
Total stockholders’ equity at Jun. 30, 2019 1,283.7 $ 0.5 625.5 664.1 (6.4)
Shares Outstanding at Mar. 31, 2019   52.8      
Total stockholders’ equity at Mar. 31, 2019 1,227.3 $ 0.5 613.2 621.0 (7.4)
Vesting of restricted stock units, value (1.3)   (1.3)    
Stock-based compensation expense 13.6   13.6    
Translation adjustments 1.0       1.0
Net income 43.1     43.1  
Shares Outstanding at Jun. 30, 2019   52.8      
Total stockholders’ equity at Jun. 30, 2019 $ 1,283.7 $ 0.5 $ 625.5 $ 664.1 $ (6.4)