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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of service-based share awards activity |
Service-based share awards |  | Number
Outstanding at January 1, 2020 |  | 921,418 |
Granted |  | 949,431 |
Vested |  | (249,700) |
Forfeited |  | (39,997) |
Outstanding at December 31, 2020 |  | 1,581,152 |
Performance-based share awards |  | Number
Outstanding at January 1, 2020 |  | 844,063 |
Granted |  | 646,565 |
Vested |  | (288,851) |
Forfeited |  | — |
Outstanding at December 31, 2020 |  | 1,201,777 |
| Year ended December 31,
Service-based share awards | 2020 |  | 2019 |  | 2018
Weighted average per share fair value of service-based share grants | $ | 7.50 |  |  | $ | 11.34 |  |  | $ | 20.21 |
Total intrinsic value of option exercises | — |  |  | 39 |  |  | 444 |
Summary of share-based compensation expense | The following table summarizes the compensation cost recognized for the years ended December 31, 2020, 2019 and 2018 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,
| 2020 |  | 2019 |  | 2018
Share-based compensation expense reported: |  |  |  |  |
Performance-based share expense | $ | 6.3 |  |  | $ | 3.0 |  |  | $ | (0.1) |
Service-based share expense | 3.3 |  |  | 3.5 |  |  | 3.8 |
Total share-based compensation expense before income tax | 9.6 |  |  | 6.5 |  |  | 3.7 |
Income tax | — |  |  | — |  |  | — |
Total share-based compensation expense, net of income tax | $ | 9.6 |  |  | $ | 6.5 |  |  | $ | 3.7 |

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