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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 (3.4)   (3.4)    
Employee stock purchase plan, shares   0.2      
Employee stock purchase plan, value 8.8   8.8    
Exercise of stock options, value 0.5   0.5    
Stock-based compensation expense 22.1   22.1    
Translation adjustments (1.5)       (1.5)
Net income 111.8     111.8  
Shares Outstanding at Sep. 30, 2018   52.4      
Total stockholders’ equity at Sep. 30, 2018 1,129.7 $ 0.5 594.1 540.2 (5.1)
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)
Vesting of restricted stock units, value (1.2)   (1.2)    
Employee stock purchase plan, shares   0.1      
Employee stock purchase plan, value 4.5   4.5    
Exercise of stock options, value 0.4   0.4    
Stock-based compensation expense 8.5   8.5    
Translation adjustments (0.3)       (0.3)
Net income 49.1     49.1  
Shares Outstanding at Sep. 30, 2018   52.4      
Total stockholders’ equity at Sep. 30, 2018 1,129.7 $ 0.5 594.1 540.2 (5.1)
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   0.3      
Vesting of restricted stock units, value (7.6)   (7.6)    
Employee stock purchase plan, shares   0.2      
Employee stock purchase plan, value 12.6   12.6    
Exercise of stock options, value 0.1   0.1    
Stock-based compensation expense $ 31.4   31.4    
Stock Repurchased and Retired During Period, Shares (0.3)        
Stock Repurchased and Retired During Period, Value $ (20.0)   (3.9) (16.1)  
Translation adjustments (2.5)       (2.5)
Net income 135.4     135.4  
Shares Outstanding at Sep. 30, 2019   52.7      
Total stockholders’ equity at Sep. 30, 2019 1,331.5 $ 0.5 634.4 705.4 (8.8)
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)
Vesting of restricted stock units, shares   0.1      
Vesting of restricted stock units, value (0.8)   (0.8)    
Employee stock purchase plan, shares   0.1      
Employee stock purchase plan, value 5.7   5.7    
Exercise of stock options, value 0.1   0.1    
Stock-based compensation expense $ 7.8   7.8    
Stock Repurchased and Retired During Period, Shares (0.3)        
Stock Repurchased and Retired During Period, Value $ (20.0)   (3.9) (16.1)  
Translation adjustments (2.4)       (2.4)
Net income 57.4     57.4  
Shares Outstanding at Sep. 30, 2019   52.7      
Total stockholders’ equity at Sep. 30, 2019 $ 1,331.5 $ 0.5 $ 634.4 $ 705.4 $ (8.8)