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v3.19.1

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) |  | 1.0 |  |  |  |
Issuance of common stock under equity incentive plans | 0.1 |  | 0.1 |  |  |
Issuance of common stock for Employee Stock Purchase Plan (in shares) |  | 0.1 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 4.1 |  | 4.1 |  |  |
Share-based compensation expense | 24.6 |  | 24.6 |  |  |
Net loss | (24.2) |  |  |  | (24.2) |
Net loss | (2.3) |  |  | (2.3) |  |
Ending Balance (in shares) at Mar. 31, 2018 |  | 88.1 |  |  |  |
Ending Balance at Mar. 31, 2018 | 421.7 | $ 0.1 | 1,122.5 | (4.9) | (696.0) | 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] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  | 0.9 |  |  |  |
Issuance of common stock under equity incentive plans | 0.2 |  | 0.2 |  |  |
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 | 25.0 |  | 25.0 |  |  |
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 |
Net loss | (26.9) |  |  |  | (26.9) |
Net loss | 0.1 |  |  | 0.1 |  |
Ending Balance (in shares) at Mar. 31, 2019 |  | 91.0 |  |  |  |
Ending Balance at Mar. 31, 2019 | $ 668.6 | $ 0.1 | $ 1,590.6 | $ 1.6 | $ (823.7) | $ (100.0)

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