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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)

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