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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of Allocation of Employee Stock-Based Compensation
The following table summarizes the aggregate stock-based compensation expense recorded in the consolidated statements of comprehensive loss related to stock options and RSUs during the three and six months ended June 30, 2022 and 2021, respectively (in millions): 
 Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Research and development$6.7 $4.4 $12.3 $8.1 
Selling, general and administrative7.6 7.4 14.8 14.2 
Total$14.3 $11.8 $27.1 $22.3