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share-based compensation - TELUS International (Cda) Inc. restricted share units (Details) |  |  | 12 Months Ended
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Feb. 04, 2021 EquityInstruments | Mar. 17, 2020 EquityInstruments | Dec. 31, 2020 EquityInstruments $ / shares | Dec. 31, 2019 EquityInstruments $ / shares | Dec. 31, 2019 EquityInstruments $ / shares | Dec. 31, 2018 EquityInstruments $ / shares | Dec. 31, 2018 EquityInstruments $ / shares
share-based compensation |  |  |  |  |  |  |
Share split ratio |  | 2 |  |  |  |  |
TELUS International (Cda) Inc. restricted share units | Shares issued and stock subdivision |  |  |  |  |  |  |
share-based compensation |  |  |  |  |  |  |
Share split ratio | 4.5 |  |  |  |  |  |
TELUS International (Cda) Inc. restricted share units | Maximum |  |  |  |  |  |  |
share-based compensation |  |  |  |  |  |  |
Variable payout (as a percent) |  |  | 150.00% |  |  |  |
TELUS International (Cda) Inc. restricted share units | Minimum |  |  |  |  |  |  |
share-based compensation |  |  |  |  |  |  |
Variable payout (as a percent) |  |  | 0.00% |  |  |  |
TELUS International (Cda) Inc. Restricted Share Units US Dollar Denominated |  |  |  |  |  |  |
Number of restricted share units - Non-vested |  |  |  |  |  |  |
Outstanding, beginning of period |  |  | 2,093,603 | 2,527,704 | 2,527,704 |  |
Non-vested |  |  |  | 1,186,524 | 1,186,524 |  |
Vested during the period |  |  | (982,395) |  |  |  |
Forfeited and cancelled |  |  | (85,532) | (83,722) | (83,722) |  |
Outstanding, end of period |  |  | 1,383,642 | 2,093,603 | 2,093,603 | 2,527,704 | 2,527,704
Number of restricted share units - vested |  |  |  |  |  |  |
Vested |  |  | 982,395 | 1,186,524 | 1,186,524 |  |
Settled in cash |  |  | (982,395) | (1,186,524) | (1,186,524) |  |
Weighted average grant-date fair value |  |  |  |  |  |  |
Outstanding, beginning of period, non-vested | $ / shares |  |  | $ 6.11 | $ 5.71 |  |  |
Vested | $ / shares |  |  | 5.95 | 5.10 |  |  |
Granted | $ / shares |  |  | 11.11 | 7.32 |  |  |
Settled in cash | $ / shares |  |  | 5.95 | 5.10 |  |  |
Forfeited | $ / shares |  |  | 7.00 | 5.94 |  |  |
Outstanding, end of period, non-vested | $ / shares |  |  | $ 7.94 | $ 6.11 |  | $ 5.71 |
TELUS International (Cda) Inc. Restricted Share Units Canadian Dollar Denominated |  |  |  |  |  |  |
Number of restricted share units - vested |  |  |  |  |  |  |
Vested |  |  |  |  |  | 145,346 | 145,346
Settled in cash |  |  |  | (145,346) | (145,346) |  |
Weighted average grant-date fair value |  |  |  |  |  |  |
Vested | $ / shares |  |  |  |  |  |  | $ 4.75
Settled in cash | $ / shares |  |  |  |  | $ 4.75 |  |

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