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Stockholders' Equity
 6 Months Ended
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.