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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of service-based share awards activity |
Service-based share awards |  | Number
Outstanding at January 1, 2021 |  | 1,581,152 |
Granted |  | 554,760 |
Vested |  | (531,846) |
Forfeited |  | (144,053) |
Outstanding at December 31, 2021 |  | 1,460,013 |
Performance-based share awards |  | Number
Outstanding at January 1, 2021 |  | 1,201,777 |
Granted |  | 496,323 |
Vested |  | (552,121) |
Forfeited |  | (72,351) |
Outstanding at December 31, 2021 |  | 1,073,628 |
| Year ended December 31,
Service-based share awards | 2021 |  | 2020 |  | 2019
Weighted average per share fair value of service-based share grants | $ | 9.97 |  |  | $ | 7.50 |  |  | $ | 11.34 |
Total intrinsic value of option exercises | — |  |  | — |  |  | 39 |
Summary of share-based compensation expense | The following table summarizes the compensation cost recognized for the years ended December 31, 2021, 2020 and 2019 for all options, 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,
| 2021 |  | 2020 |  | 2019
Share-based compensation expense reported: |  |  |  |  |
Performance-based share expense | $ | 12.5 |  |  | $ | 6.3 |  |  | $ | 3.0 |
Service-based share expense | 8.3 |  |  | 3.3 |  |  | 3.5 |
Total share-based compensation expense before income tax | 20.8 |  |  | 9.6 |  |  | 6.5 |
Income tax | — |  |  | — |  |  | — |
Total share-based compensation expense, net of income tax | $ | 20.8 |  |  | $ | 9.6 |  |  | $ | 6.5 |

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