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Stockholders' Equity
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Stockholders' Equity
7. Stockholders’ Equity
Share-Based Compensation
Our share-based compensation expense is associated with restricted stock units, or RSUs, performance stock units, or PSUs, and our Employee Stock Purchase Plan, or ESPP. The following table summarizes our share-based compensation expense included in our consolidated statements of operations for the periods shown.
Three Months Ended
September 30,
Nine Months Ended
September 30,
(In millions)2021202020212020
Cost of sales$2.0 $4.8 $6.6 $10.8 
Research and development9.8 9.9 31.3 27.9 
Selling, general and administrative15.7 16.0 49.2 46.6 
Total share-based compensation expense$27.5 $30.7 $87.1 $85.3 
At September 30, 2021, unrecognized estimated compensation costs related to RSUs, PSUs and ESPP totaled $178.2 million and is expected to be recognized through 2024.
Equity Award Activity
The total vest date fair value of RSUs and PSUs that vested during the nine months ended September 30, 2021 was $240.4 million and $29.5 million, respectively.