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Share-Based Compensation Plan - Shares Outstanding (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Total number of share awards |  |
Beginning balance (in shares) | 6,936 | 6,516
Granted (in shares) | 5,492 | 6,429
Vested and converted to common shares (in shares) | (2,922) | (4,245)
Forfeited (in shares) | (1,296) | (1,764)
Ending balance (in shares) | 8,210 | 6,936
Minimum |  |
Total number of share awards |  |
Payout multiplier | 0.00% |
Maximum |  |
Total number of share awards |  |
Payout multiplier | 200.00% |
Restricted awards |  |
Total number of share awards |  |
Beginning balance (in shares) | 3,801 | 3,243
Granted (in shares) | 2,239 | 3,184
Vested and converted to common shares (in shares) | (1,730) | (2,081)
Forfeited (in shares) | (188) | (545)
Ending balance (in shares) | 4,122 | 3,801
Performance awards |  |
Total number of share awards |  |
Beginning balance (in shares) | 3,135 | 3,273
Granted (in shares) | 3,253 | 3,245
Vested and converted to common shares (in shares) | (1,192) | (2,164)
Forfeited (in shares) | (1,108) | (1,219)
Ending balance (in shares) | 4,088 | 3,135

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