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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance (in shares) at Dec. 31, 2017   52.2      
Balance at Dec. 31, 2017 $ 991.4 $ 0.5 $ 566.1 $ 428.4 $ (3.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Vesting of restricted stock units and restricted stock awards (in shares)   0.1      
Vesting of restricted stock units and restricted stock awards (4.7) $ 0.0 (4.7)    
Employee stock purchase plan (in shares)   0.2      
Employee stock purchase plan 8.8 $ 0.0 8.8    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   0.0      
Exercise of common stock options 0.6 $ 0.0 0.6    
Stock-based compensation expense 31.0   31.0    
Translation adjustments (2.7)       (2.7)
Net income 157.7     157.7  
Balance (in shares) at Dec. 31, 2018   52.5      
Balance at Dec. 31, 2018 1,182.1 $ 0.5 601.8 586.1 (6.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Vesting of restricted stock units and restricted stock awards (in shares)   0.4      
Vesting of restricted stock units and restricted stock awards (12.1) $ 0.0 (12.1)    
Employee stock purchase plan (in shares)   0.2      
Employee stock purchase plan 12.6 $ 0.0 12.6    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   0.1      
Exercise of common stock options 0.1   0.1    
Stock-based compensation expense 39.5   39.5    
Stock Repurchased and Retired During Period, Shares   (0.3)      
Stock Repurchased and Retired During Period, Value (20.0) $ 0.0 (3.9) (16.1)  
Translation adjustments (0.7)       (0.7)
Net income 174.7     174.7  
Balance (in shares) at Dec. 31, 2019   52.9      
Balance at Dec. 31, 2019 1,376.2 $ 0.5 638.0 744.7 (7.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Vesting of restricted stock units and restricted stock awards (in shares)   0.3      
Vesting of restricted stock units and restricted stock awards (12.0) $ 0.0 (12.0)    
Employee stock purchase plan (in shares)   0.4      
Employee stock purchase plan 11.1 $ 0.0 11.1    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   0.1      
Exercise of common stock options 1.0   1.0    
Stock-based compensation expense 32.4   32.4    
Stock Repurchased and Retired During Period, Shares   (0.8)      
Stock Repurchased and Retired During Period, Value (27.9) $ 0.0 (9.2) (18.7)  
Translation adjustments 6.0       6.0
Net income 200.3     200.3  
Balance (in shares) at Dec. 31, 2020   52.9      
Balance at Dec. 31, 2020 $ 1,587.1 $ 0.5 $ 661.3 $ 926.3 $ (1.0)