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Stock-Based Employee Compensation- Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Restricted Stock Units and Common Stock Option [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Compensation expense related to restricted stock | $ 84.0 |
Weighted average period of recognized term | 2 years 4 months 20 days | 3 years 5 months 26 days
Common Stock [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Common stock, capital shares reserved for future issuance | 12,719,849 |

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