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share-based compensation - TELUS Corp restricted share units activity (Details) | 12 Months Ended
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Dec. 31, 2020 EquityInstruments $ / shares | Dec. 31, 2020 EquityInstruments $ / shares | Dec. 31, 2019 EquityInstruments $ / shares | Dec. 31, 2019 EquityInstruments $ / shares
Restricted share units without market performance conditions |  |  |  |
Number of restricted share units - Non-vested |  |  |  |
Outstanding, beginning of period | 6,468,954 | 6,468,954 | 6,387,040 | 6,387,040
Granted | 3,199,809 | 3,199,809 | 4,092,094 | 4,092,094
In lieu of dividends | 428,750 | 428,750 | 333,600 | 333,600
Vested during the period | (3,696,539) | (3,696,539) | (4,004,162) | (4,004,162)
Forfeited and cancelled | (383,689) | (383,689) | (339,618) | (339,618)
Outstanding, end of period | 6,017,285 | 6,017,285 | 6,468,954 | 6,468,954
Number of restricted share units - vested |  |  |  |
Outstanding, beginning of period | 30,800 | 30,800 | 126,766 | 126,766
In lieu dividends | 624 | 624 | 578 | 578
Vested | 3,696,539 | 3,696,539 | 4,004,162 | 4,004,162
Settled in cash | (3,053,349) | (3,053,349) | (4,100,706) | (4,100,706)
Settled in equity | (644,744) | (644,744) |  |
Outstanding, end of period | 29,870 | 29,870 | 30,800 | 30,800
Weighted average grant-date fair value |  |  |  |
Outstanding, beginning of period, non-vested | $ / shares |  | $ 23.37 |  | $ 22.42
Outstanding, beginning of period, vested | $ / shares |  | 22.02 |  | 22.45
Issued - initial award | $ / shares |  | 25.36 |  | 23.82
In lieu of dividends | $ / shares |  | 23.08 |  | 23.62
Vested | $ / shares |  | 23.14 |  | 22.28
Settled in cash | $ / shares |  | 22.82 |  | 22.28
Settled in equity | $ / shares |  | 24.17 |  |
Forfeited | $ / shares |  | 23.82 |  | 22.65
Outstanding, end of period, non-vested | $ / shares |  | 24.55 |  | 23.37
Outstanding, end of period, vested | $ / shares |  | $ 24.58 |  | $ 22.02
Number of Rsu's | 29,870 | 29,870 | 30,800 | 30,800
TELUS International (Cda) Inc. Restricted Share Units US Dollar Denominated |  |  |  |
Number of restricted share units - Non-vested |  |  |  |
Outstanding, beginning of period | 2,093,603 | 2,093,603 | 2,527,704 | 2,527,704
Granted | 357,966 | 357,966 | 836,145 | 836,145
Vested during the period | (982,395) | (982,395) |  |
Forfeited and cancelled | (85,532) | (85,532) | (83,722) | (83,722)
Outstanding, end of period | 1,383,642 | 1,383,642 | 2,093,603 | 2,093,603
Number of restricted share units - vested |  |  |  |
Vested | 982,395 | 982,395 | 1,186,524 | 1,186,524
Settled in cash | (982,395) | (982,395) | (1,186,524) | (1,186,524)
Weighted average grant-date fair value |  |  |  |
Issued - initial award | $ / shares | $ 11.11 |  | $ 7.32 |
Vested | $ / shares | 5.95 |  | 5.10 |
Settled in cash | $ / shares | 5.95 |  | 5.10 |
Forfeited | $ / shares | $ 7.00 |  | $ 5.94 |

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