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v3.19.3

Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2017 |  | 87.0 |  |  |  |
Beginning Balance at Dec. 31, 2017 | $ 419.4 | $ 0.1 | $ 1,093.7 | $ (2.6) | $ (671.8) | $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  | 1.6 |  |  |  |
Issuance of common stock under equity incentive plans | 1.7 |  | 1.7 |  |  |
Issuance of common stock for Employee Stock Purchase Plan (in shares) |  | 0.2 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 8.9 |  | 8.9 |  |  |
Share-based compensation expense | 77.3 |  | 77.3 |  |  |
Net income | 52.6 |  |  |  | 52.6 |
Other comprehensive loss | 2.3 |  |  | 2.3 |  |
Ending Balance (in shares) at Sep. 30, 2018 |  | 88.8 |  |  |  |
Ending Balance at Sep. 30, 2018 | 562.2 | $ 0.1 | 1,181.6 | (0.3) | (619.2) | 0.0
Beginning Balance (in shares) at Jun. 30, 2018 |  | 88.4 |  |  |  |
Beginning Balance at Jun. 30, 2018 | 482.1 | $ 0.1 | 1,149.1 | (1.3) | (665.8) | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  | 0.3 |  |  |  |
Issuance of common stock under equity incentive plans | 0.6 |  | 0.6 |  |  |
Issuance of common stock for Employee Stock Purchase Plan (in shares) |  | 0.1 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 4.8 |  | 4.8 |  |  |
Share-based compensation expense | 27.1 |  | 27.1 |  |  |
Net income | 46.6 |  |  |  | 46.6 |
Other comprehensive loss | 1.0 |  |  | 1.0 |  |
Ending Balance (in shares) at Sep. 30, 2018 |  | 88.8 |  |  |  |
Ending Balance at Sep. 30, 2018 | 562.2 | $ 0.1 | 1,181.6 | (0.3) | (619.2) | 0.0
Beginning Balance (in shares) at Dec. 31, 2018 |  | 90.0 |  |  |  |
Beginning Balance at Dec. 31, 2018 | 663.3 | $ 0.1 | 1,560.6 | 1.5 | (798.9) | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative-effect adjustment from adoption of new lease accounting standard (Note 2) | 2.1 |  |  |  |  |
Cumulative-effect adjustment from adoption of new lease accounting standard (Note 2) | Accounting Standards Update 2016-02 |  |  |  |  | 2.1 |
Issuance of common stock under equity incentive plans (in shares) |  | 1.3 |  |  |  |
Issuance of common stock under equity incentive plans | 0.3 |  | 0.3 |  |  |
Issuance of common stock for Employee Stock Purchase Plan (in shares) |  | 0.2 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 11.6 |  | 11.6 |  |  |
Share-based compensation expense | 79.1 |  | 79.1 |  |  |
Net income | 8.4 |  |  |  | 8.4 |
Other comprehensive loss | (0.5) |  |  | (0.5) |  |
Ending Balance (in shares) at Sep. 30, 2019 |  | 91.5 |  |  |  |
Ending Balance at Sep. 30, 2019 | 764.3 | $ 0.1 | 1,651.6 | 1.0 | (788.4) | (100.0)
Beginning Balance (in shares) at Jun. 30, 2019 |  | 91.2 |  |  |  |
Beginning Balance at Jun. 30, 2019 | 688.3 | $ 0.1 | 1,620.4 | 2.0 | (834.2) | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  | 0.2 |  |  |  |
Issuance of common stock under equity incentive plans | 0.0 |  | 0.0 |  |  |
Issuance of common stock for Employee Stock Purchase Plan (in shares) |  | 0.1 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 6.8 |  | 6.8 |  |  |
Share-based compensation expense | 24.4 |  | 24.4 |  |  |
Net income | 45.8 |  |  |  | 45.8 |
Other comprehensive loss | (1.0) |  |  | (1.0) |  |
Ending Balance (in shares) at Sep. 30, 2019 |  | 91.5 |  |  |  |
Ending Balance at Sep. 30, 2019 | $ 764.3 | $ 0.1 | $ 1,651.6 | $ 1.0 | $ (788.4) | $ (100.0)

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