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v3.20.4

Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | --- | ---
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |  |
Balance at beginning of period (shares) at Dec. 31, 2017 |  |  | 87,000,000.0 |  |  |  |  |
Balance at beginning of period 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 (shares) |  |  | 1,800,000 |  |  |  |  |
Issuance of common stock under equity incentive plans | 1.9 |  |  | 1.9 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan (shares) |  |  | 200,000 |  |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 8.9 |  |  | 8.9 |  |  |  |
Issuance of common stock for collaborative research and development fee (shares) |  |  | 1,800,000 |  |  |  |  |
Issuance of common stock for collaborative research and development fee | 217.7 |  |  | 217.7 |  |  |  |
Convertible note hedge | (218.9) |  |  | (218.9) |  |  |  |
Equity component of convertible note issuance, net of issuance costs | $ 171.6 |  |  | 171.6 |  |  |  |
Purchases of treasury stock (shares) | (800,000) |  | (800,000) |  |  |  |  |
Purchases of treasury stock | $ (100.0) |  |  |  |  |  |  | (100.0)
Sale of warrants | 183.8 |  |  | 183.8 |  |  |  |
Share-based compensation expense | 101.9 |  |  | 101.9 |  |  |  |
Net income (loss) | (127.1) |  |  |  |  | (127.1) |  |
Other comprehensive income, net of tax | 4.1 |  |  |  | 4.1 |  |  |
Balance at end of period (shares) at Dec. 31, 2018 |  |  | 90,000,000.0 |  |  |  |  |
Balance at end of period at Dec. 31, 2018 | 663.3 | $ 2.1 | $ 0.1 | 1,560.6 | 1.5 | (798.9) | $ 2.1 | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock under equity incentive plans (shares) |  |  | 1,400,000 |  |  |  |  |
Issuance of common stock under equity incentive plans | 0.3 |  |  | 0.3 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan (shares) |  |  | 200,000 |  |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 11.6 |  |  | 11.6 |  |  |  |
Tax benefit from Notes | $ 0.7 |  |  | 0.7 |  |  |  |
Purchases of treasury stock (shares) | 0 |  |  |  |  |  |  |
Share-based compensation expense | $ 102.7 |  |  | 102.7 |  |  |  |
Net income (loss) | 101.1 |  |  |  |  | 101.1 |  |
Other comprehensive income, net of tax | 0.8 |  |  |  | 0.8 |  |  |
Balance at end of period (shares) at Dec. 31, 2019 |  |  | 91,600,000 |  |  |  |  |
Balance at end 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) |  |  | 1,100,000 |  |  |  |  |
Issuance of common stock under equity incentive plans | 0.3 |  |  | 0.3 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 15.0 |  |  | 15.0 |  |  |  |
Equity component of convertible note issuance, net of issuance costs | 289.4 |  |  | 289.4 |  |  |  |
Tax benefit from Notes | (62.5) |  |  | (62.5) |  |  |  |
Repurchase and conversions of 2022 notes (in shares) |  |  | 3,400,000 |  |  |  |  |
Repurchase and conversions of 2022 Notes | $ 87.8 |  |  | 87.8 |  |  |  |
Purchases of treasury stock (shares) | 0 |  |  |  |  |  |  |
Share-based compensation expense | $ 119.4 |  |  | 119.4 |  |  |  |
Net income (loss) | 493.6 |  |  |  |  | 493.6 |  |
Other comprehensive income, net of tax | 0.9 |  |  |  | 0.9 |  |  |
Balance at end of period (shares) at Dec. 31, 2020 |  |  | 96,100,000 |  |  |  |  |
Balance at end of period at Dec. 31, 2020 | $ 1,826.5 |  | $ 0.1 | $ 2,125.3 | $ 3.2 | $ (202.1) |  | $ (100.0)

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