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v3.20.1

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
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (shares) at Dec. 31, 2018 |  | 90.0 |  |  |  |
Balance at beginning of period 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 (shares) |  | 0.9 |  |  |  |
Issuance of common stock under equity incentive plans | 0.2 |  | 0.2 |  |  |
Issuance of common stock for Employee Stock Purchase Plan (shares) |  | 0.1 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 4.8 |  | 4.8 |  |  |
Share-based compensation expense | 25.0 |  | 25.0 |  |  |
Net income (loss) | (26.9) |  |  |  | (26.9) |
Other comprehensive income (loss) | 0.1 |  |  | 0.1 |  |
Balance at end of period (shares) at Mar. 31, 2019 |  | 91.0 |  |  |  |
Balance at end of period at Mar. 31, 2019 | 668.6 | $ 0.1 | 1,590.6 | 1.6 | (823.7) | (100.0)
Balance at beginning of period (shares) at Dec. 31, 2019 |  | 91.6 |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | 882.6 | $ 0.1 | 1,675.9 | 2.3 | (695.7) | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (shares) |  | 0.7 |  |  |  |
Issuance of common stock under equity incentive plans | 0.3 |  | 0.3 |  |  |
Issuance of common stock for Employee Stock Purchase Plan (shares) |  | 0.0 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 6.4 |  | 6.4 |  |  |
Share-based compensation expense | 23.9 |  | 23.9 |  |  |
Net income (loss) | 19.9 |  |  |  | 19.9 |
Other comprehensive income (loss) | 1.4 |  |  | 1.4 |  |
Balance at end of period (shares) at Mar. 31, 2020 |  | 92.3 |  |  |  |
Balance at end of period at Mar. 31, 2020 | $ 934.5 | $ 0.1 | $ 1,706.5 | $ 3.7 | $ (675.8) | $ (100.0)

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