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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)

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