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Stock-Based Compensation - Restricted Stock and Restricted Stock Units (Details) - Stock options and RSUs - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-Based Compensation |  |  |  |
Allocated share-based compensation expense | $ 14.3 | $ 11.8 | $ 27.1 | $ 22.3
Research and development |  |  |  |
Stock-Based Compensation |  |  |  |
Allocated share-based compensation expense | 6.7 | 4.4 | 12.3 | 8.1
Selling, general and administrative |  |  |  |
Stock-Based Compensation |  |  |  |
Allocated share-based compensation expense | $ 7.6 | $ 7.4 | $ 14.8 | $ 14.2

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