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share-based compensation - TELUS International (Cda) Inc. restricted stock units (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) EquityInstruments | Dec. 31, 2018 CAD ($) EquityInstruments | Dec. 31, 2017 USD ($) EquityInstruments | Dec. 31, 2017 CAD ($) EquityInstruments | Dec. 31, 2016 CAD ($) EquityInstruments
TELUS International (Cda) Inc. Restricted Stock Units US Dollar Denominated |  |  |  |  |
Number of restricted stock units - Non-vested |  |  |  |  |
Outstanding, beginning of period | 374,786 | 374,786 | 163,785 | 163,785 |
Issued - initial award | 197,495 | 197,495 | 213,768 | 213,768 |
Vested |  |  | (208) | (208) |
Forfeited and cancelled | (10,569) | (10,569) |  |  |
Outstanding, end of period | 561,712 | 561,712 | 374,786 | 374,786 | 163,785
Number of restricted stock units - vested |  |  |  |  |
Vested |  |  | 208 | 208 |
Exercised |  |  | (208) | (208) |
Forfeited and cancelled |  |  | (2,559) | (2,559) |
Weighted average grant-date fair value |  |  |  |  |
Outstanding, beginning of period, non-vested | $ 24.45 | $ 24.45 |  | $ 21.90 |
Issued - initial award | 28.07 |  |  | 26.40 |
Vested | $ |  |  |  | 24.10 |
Exercised | $ |  |  |  | 24.10 |
Forfeited and cancelled | 26.28 |  |  | 24.10 |
Outstanding, end of period, non-vested | $ 25.68 |  | $ 24.45 | $ 24.45 | $ 21.90
TELUS International (Cda) Inc. Restricted Stock Units Canadian Dollar Denominated |  |  |  |  |
Number of restricted stock units - Non-vested |  |  |  |  |
Vested |  |  |  |  | 32,299
Number of restricted stock units - vested |  |  |  |  |
Outstanding, beginning of period | 32,299 | 32,299 |  |  |
Vested |  |  |  |  | (32,299)
Outstanding, end of period | 32,299 | 32,299 | 32,299 | 32,299 |
Weighted average grant-date fair value |  |  |  |  |
Outstanding, beginning of period, vested | $ |  | $ 21.36 |  | $ 21.36 |
Outstanding, end of period, vested | $ |  | $ 21.36 |  | $ 21.36 | $ 21.36
Maximum | TELUS International (Cda) Inc. restricted stock units |  |  |  |  |
share-based compensation |  |  |  |  |
Variable payout (as a percent) | 150.00% | 150.00% |  |  |
Minimum | TELUS International (Cda) Inc. restricted stock units |  |  |  |  |
share-based compensation |  |  |  |  |
Variable payout (as a percent) | 0.00% | 0.00% |  |  |

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