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v3.22.0.1

Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ 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
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (shares) at Dec. 31, 2018 |  |  | 90.0 |  |  |  |  |
Balance at beginning 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 (in shares) |  |  | 1.4 |  |  |  |  |
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 |  |  |  |
Tax benefit related to Senior Convertible Notes | 0.7 |  |  | 0.7 |  |  |  |
Share-based compensation expense | 102.7 |  |  | 102.7 |  |  |  |
Net income | 101.1 |  |  |  |  | 101.1 |  |
Other comprehensive income (loss), net of tax | 0.8 |  |  |  | 0.8 |  |  |
Balance at end of period (shares) at Dec. 31, 2019 |  |  | 91.6 |  |  |  |  |
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 (in shares) |  |  | 1.1 |  |  |  |  |
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 2025 Notes issuance, net of issuance costs | 289.4 |  |  | 289.4 |  |  |  |
Tax benefit related to Senior Convertible Notes | (62.5) |  |  | (62.5) |  |  |  |
Repurchase and conversions of Notes (in shares) |  |  | 3.4 |  |  |  |  |
Repurchase and conversions of Notes | 87.8 |  |  | 87.8 |  |  |  |
Share-based compensation expense | 119.4 |  |  | 119.4 |  |  |  |
Net income | 493.6 |  |  |  |  | 493.6 |  |
Other comprehensive income (loss), net of tax | 0.9 |  |  |  | 0.9 |  |  |
Balance at end of period (shares) at Dec. 31, 2020 |  |  | 96.1 |  |  |  |  |
Balance at end of period at Dec. 31, 2020 | 1,826.5 |  | $ 0.1 | 2,125.3 | 3.2 | (202.1) |  | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  |  | 0.7 |  |  |  |  |
Issuance of common stock under equity incentive plans | 0.0 |  |  |  |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 20.3 |  |  | 20.3 |  |  |  |
Tax benefit related to Senior Convertible Notes | (1.1) |  |  | (1.1) |  |  |  |
Repurchase and conversions of Notes (in shares) |  |  | 0.4 |  |  |  |  |
Repurchase and conversions of Notes | 53.3 |  |  | 28.7 |  |  |  | 24.6
Benefit of note hedge upon conversions of 2023 Notes (in shares) |  |  | (0.2) |  |  |  |  |
Benefit of note hedge upon conversions of 2023 Notes | 0.0 |  |  | 130.8 |  |  |  | (130.8)
Share-based compensation expense | 113.4 |  |  | 113.4 |  |  |  |
Collaborative research and development fee | 87.1 |  |  | 87.1 |  |  |  |
Net income | 154.7 |  |  |  |  | 154.7 |  |
Other comprehensive income (loss), net of tax | (2.7) |  |  |  | (2.7) |  |  |
Balance at end of period (shares) at Dec. 31, 2021 |  |  | 97.0 |  |  |  |  |
Balance at end of period at Dec. 31, 2021 | $ 2,251.5 |  | $ 0.1 | $ 2,504.5 | $ 0.5 | $ (47.4) |  | $ (206.2)

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