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Stockholders' Equity
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Stockholders' Equity 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)
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
Cost of sales
$
2.4

 
$
2.4

 
$
4.7

 
$
4.6

Research and development
9.2

 
8.2

 
17.7

 
16.7

Selling, general and administrative
18.1

 
15.0

 
32.3

 
28.9

Total share-based compensation expense included in net income (loss)
$
29.7

 
$
25.6

 
$
54.7

 
$
50.2


As of June 30, 2019, unrecognized estimated compensation costs related to unvested restricted stock units, or RSUs, and performance stock units, or PSUs, totaled $161.7 million and is expected to be recognized through 2022.
Restricted Stock Units
A summary of our RSU and PSU activity for the six months ended June 30, 2019 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, 2018
2.7

 
$
69.19

 
$
319.0

Granted
0.6

 
141.76

 
 
Vested
(1.1
)
 
66.81

 
 
Forfeited
(0.1
)
 
82.19

 
 
Nonvested at June 30, 2019
2.1

 
$
91.60

 
$
320.5



The total vest date fair value of RSUs that vested during the six months ended June 30, 2019 was $149.2 million. No PSUs vested during that period.