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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-Based Compensation Expense
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
June 30,
Six Months Ended
June 30,
(In millions)2021202020212020
Cost of sales$2.6 $4.1 $4.6 $6.0 
Research and development11.1 9.8 21.5 18.0 
Selling, general and administrative17.9 16.8 33.5 30.6 
Total share-based compensation expense$31.6 $30.7 $59.6 $54.6