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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of 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)2020201920202019
Cost of sales$4.8 $2.2 $10.8 $6.9 
Research and development9.9 8.1 27.9 25.8 
Selling, general and administrative16.0 14.1 46.6 46.4 
Total share-based compensation expense included in net income$30.7 $24.4 $85.3 $79.1 
Schedule of Restricted Stock Units
A summary of our RSU and PSU activity for the nine months ended September 30, 2020 is as follows:
Weighted
AverageAggregate
Grant DateIntrinsic
(In millions, except weighted average grant date fair values)SharesFair ValueValue
Nonvested at December 31, 20191.8 $96.63 $392.0 
Granted0.4 296.24 
Vested(1.0)88.57 
Forfeited— 119.25 
Nonvested at September 30, 20201.2 $176.10 $500.8