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Stockholders' Equity
3 Months Ended
Mar. 31, 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
March 31,
(In millions)20212020
Cost of sales$2.0 $1.9 
Research and development10.4 8.2 
Selling, general and administrative15.6 13.8 
Total share-based compensation expense$28.0 $23.9 
At March 31, 2021, unrecognized estimated compensation costs related to RSUs, PSUs and ESPP totaled $240.9 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 three months ended March 31, 2021 was $183.2 million and $29.5 million, respectively.