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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Share-Based Compensation Expense | Our share-based compensation expense is associated with restricted stock units, or RSUs, performance stock units, or PSUs, and our Employee Stock Purchase Plan, or ESPP. The following table summarizes our share-based compensation expense included in our consolidated statements of operations for the periods shown.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of sales | $ | 2.6 |  |  | $ | 4.1 |  |  | $ | 4.6 |  |  | $ | 6.0 |
Research and development | 11.1 |  |  | 9.8 |  |  | 21.5 |  |  | 18.0 |
Selling, general and administrative | 17.9 |  |  | 16.8 |  |  | 33.5 |  |  | 30.6 |
Total share-based compensation expense | $ | 31.6 |  |  | $ | 30.7 |  |  | $ | 59.6 |  |  | $ | 54.6 |

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