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Stockholders’ Equity and Stock-Based Compensation - Stock Appreciation Rights (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense (reduction to expense) | $ 14.2 | $ 19.7 | $ 26.1 | $ 36.2 |
Stock Appreciation Rights (SARs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 4 years |  |
Liability for cash-settled awards | 0.9 |  | $ 0.9 |  | $ 5.8
Unrecognized compensation cost, other awards | 0.3 |  | $ 0.3 |  |
Unamortized compensation costs, weighted average period of recognition |  |  | 1 year 7 months 6 days |  |
Stock-based compensation expense (reduction to expense) | $ 0.1 | $ (3.6) | $ (4.5) | (3.7) |
Amounts paid on cash-settled awards |  |  | $ 0.1 | $ 0.6 |

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