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Stock-Based Compensation - RSUs to be Settled in Cash (Details) - Restricted Stock Units to be Settled in Cash - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense related to RSUs to be settled in cash | $ 13.7 | $ 5.3 |
Payments to settle liabilities under compensation plan | 13.2 | $ 4.3 |
Accrued liabilities under compensation plan | $ 7.4 |  | $ 8.7

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