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Stockholders' Equity
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
(In millions)
2019
 
2018
 
2019
 
2018
Cost of sales
$
2.2

 
$
2.5

 
$
6.9

 
$
7.1

Research and development
8.1

 
8.1

 
25.8

 
24.8

Selling, general and administrative
14.1

 
16.5

 
46.4

 
45.4

Total share-based compensation expense included in net income
$
24.4

 
$
27.1

 
$
79.1

 
$
77.3


As of September 30, 2019, unrecognized estimated compensation costs related to unvested restricted stock units, or RSUs, and performance stock units, or PSUs, totaled $139.8 million and is expected to be recognized through 2022.
Restricted Stock Units
A summary of our RSU and PSU activity for the nine months ended September 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
0.7

 
142.87

 
 
Vested
(1.4
)
 
68.89

 
 
Forfeited
(0.2
)
 
83.09

 
 
Nonvested at September 30, 2019
1.8

 
$
95.06

 
$
276.0



The total vest date fair value of RSUs that vested during the nine months ended September 30, 2019 was $195.9 million. No PSUs vested during that period.