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Stockholders' Equity
 3 Months Ended
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.