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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of service-based share awards activity |
Service-based share awards |  | Number
Outstanding at January 1, 2023 |  | 739,356 |
Granted |  | 766,929 |
Vested |  | (293,404) |
Forfeited |  | (56,107) |
Outstanding at December 31, 2023 |  | 1,156,774 |
Performance-based share awards |  | Number
Outstanding at January 1, 2023 |  | 444,056 |
Granted |  | 407,808 |
Vested |  | (45,605) |
Forfeited |  | (203,695) |
Outstanding at December 31, 2023 |  | 602,564 |
| Year ended December 31,
Service-based share awards | 2023 |  | 2022 |  | 2021
Weighted average per share fair value of service-based share grants | $ | 12.58 |  |  | $ | 17.30 |  |  | $ | 9.97 |
Summary of share-based compensation expense | The following table summarizes the compensation cost recognized for the years ended December 31, 2023, 2022 and 2021 for all service-based and performance-based share awards. The compensation cost is included as part of selling, general and administrative expenses in our Consolidated Statements of Operations.
| Year ended December 31,
| 2023 |  | 2022 |  | 2021
Share-based compensation (benefit) expense reported: |  |  |  |  |
Performance-based share (benefit) expense | $ | 2.0 |  |  | $ | (5.0) |  |  | $ | 12.5 |
Service-based share expense | 4.6 |  |  | 4.4 |  |  | 8.3 |
Total share-based compensation (benefit) expense before income tax | 6.6 |  |  | (0.6) |  |  | 20.8 |
Income tax | — |  |  | — |  |  | — |
Total share-based compensation (benefit) expense, net of income tax | $ | 6.6 |  |  | $ | (0.6) |  |  | $ | 20.8 |

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