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Stockholders' Equity (Tables)
9 Months Ended
Sep. 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
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