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Stockholders' Equity | 3 Months Ended
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Mar. 31, 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 March 31,
(In millions) | 2020 |  | 2019
Cost of sales | $ | 1.9 |  |  | $ | 2.3 |
Research and development | 8.2 |  |  | 8.5 |
Selling, general and administrative | 13.8 |  |  | 14.2 |
Total share-based compensation expense included in net income | $ | 23.9 |  |  | $ | 25.0 |
As of March 31, 2020, unrecognized estimated compensation costs related to unvested restricted stock units, or RSUs, and performance stock units, or PSUs, totaled $211.7 million and is expected to be recognized through 2023. Restricted Stock Units A summary of our RSU and PSU activity for the three months ended March 31, 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 |  |  | 286.45 |  |  |
Vested | (0.7 | ) |  | 87.22 |  |  |
Forfeited | — |  |  | 105.48 |  |  |
Nonvested at March 31, 2020 | 1.5 |  |  | $ | 153.08 |  |  | $ | 401.3 |
The total vest date fair value of RSUs that vested during the three months ended March 31, 2020 was $192.8 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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