CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Paid-in Capital | Retained Earnings | Other |
Common Stock, Shares | | 52.9 | | | |
Total stockholders’ equity at Dec. 31, 2019 | $ 1,376.2 | $ 0.5 | $ 638 | $ 744.7 | $ (7) |
Employee stock purchase plan, shares | | 0.4 | | | |
Employee stock purchase plan, value | 5.9 | | 5.9 | | |
Stock-based compensation expense | 17.1 | | 17.1 | | |
Stock Repurchased and Retired During Period, Shares | | (0.8) | | | |
Stock Repurchased and Retired During Period, Value | (27.9) | | (9.2) | (18.7) | |
Foreign currency translation adjustments | (0.9) | | | | (0.9) |
Net income | 92.6 | | | 92.6 | |
Shares Outstanding at Jun. 30, 2020 | | 52.5 | | | |
Total stockholders’ equity at Jun. 30, 2020 | 1,457.1 | $ 0.5 | 645.9 | 818.6 | (7.9) |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (5.9) | | (5.9) | | |
Vesting of restricted stock units, shares | | 0 | | | |
Common Stock, Shares | | 52.4 | | | |
Total stockholders’ equity at Mar. 31, 2020 | 1,399.5 | $ 0.5 | 638.7 | 769.8 | (9.5) |
Employee stock purchase plan, shares | | 0.1 | | | |
Employee stock purchase plan, value | 0 | | 0 | | |
Stock-based compensation expense | 8.2 | | 8.2 | | |
Foreign currency translation adjustments | 1.6 | | | | 1.6 |
Net income | 48.8 | | | 48.8 | |
Shares Outstanding at Jun. 30, 2020 | | 52.5 | | | |
Total stockholders’ equity at Jun. 30, 2020 | 1,457.1 | $ 0.5 | 645.9 | 818.6 | (7.9) |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (1) | | (1) | | |
Vesting of restricted stock units, shares | | 0 | | | |
Total stockholders’ equity at Dec. 31, 2020 | 1,587.1 | $ 0.5 | 661.3 | 926.3 | (1) |
Employee stock purchase plan, shares | | 0.3 | | | |
Employee stock purchase plan, value | 7.7 | | 7.7 | | |
Stock-based compensation expense | 21.1 | | 21.1 | | |
Foreign currency translation adjustments | (1.9) | | | | (1.9) |
Net income | 112.9 | | | 112.9 | |
Shares Outstanding at Jun. 30, 2021 | | 53.2 | | | |
Total stockholders’ equity at Jun. 30, 2021 | 1,719.8 | $ 0.5 | 683 | 1,039.2 | (2.9) |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (7.1) | | (7.1) | | |
Vesting of restricted stock units, shares | | 0 | | | |
Common Stock, Shares | | 53.2 | | | |
Total stockholders’ equity at Mar. 31, 2021 | 1,645.8 | $ 0.5 | 674.5 | 975 | (4.2) |
Stock-based compensation expense | 10.8 | | 10.8 | | |
Foreign currency translation adjustments | 1.3 | | | | 1.3 |
Net income | 64.2 | | | 64.2 | |
Shares Outstanding at Jun. 30, 2021 | | 53.2 | | | |
Total stockholders’ equity at Jun. 30, 2021 | 1,719.8 | $ 0.5 | 683 | $ 1,039.2 | $ (2.9) |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | $ (2.3) | | $ (2.3) | | |
Vesting of restricted stock units, shares | | 0 | | | |