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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [Abstract] |
Stockholders' Equity |
7. Stockholders’ Equity
Share-Based Compensation Expense The following table summarizes share-based compensation expense, net of capitalized amounts, for the periods shown.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Cost of sales | $ | 4.1 |  |  | $ | 2.4 |  |  | $ | 6.0 |  |  | $ | 4.7 |
Research and development | 9.8 |  |  | 9.2 |  |  | 18.0 |  |  | 17.7 |
Selling, general and administrative | 16.8 |  |  | 18.1 |  |  | 30.6 |  |  | 32.3 |
Total share-based compensation expense included in net income | $ | 30.7 |  |  | $ | 29.7 |  |  | $ | 54.6 |  |  | $ | 54.7 |
As of June 30, 2020, unrecognized estimated compensation costs related to unvested restricted stock units, or RSUs, and performance stock units, or PSUs, totaled $190.3 million and is expected to be recognized through 2023. Restricted Stock Units A summary of our RSU and PSU activity for the six months ended June 30, 2020 is as follows:
|  |  | Weighted |  |
|  |  | Average |  | Aggregate
|  |  | Grant Date |  | Intrinsic
(In millions, except weighted average grant date fair values) | Shares |  | Fair Value |  | Value
Nonvested at December 31, 2019 | 1.8 |  |  | $ | 96.63 |  |  | $ | 392.0 |
Granted | 0.4 |  |  | 291.68 |  |  |
Vested | (0.8 | ) |  | 87.53 |  |  |
Forfeited | — |  |  | 107.68 |  |  |
Nonvested at June 30, 2020 | 1.4 |  |  | $ | 161.58 |  |  | $ | 572.2 |
The total vest date fair value of RSUs that vested during the six months ended June 30, 2020 was $224.0 million. No PSUs vested during that period.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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