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share-based compensation - TELUS International (Cda) Inc. share options (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) Y Options | Dec. 31, 2018 CAD ($) Options | Dec. 31, 2017 USD ($) Options | Dec. 31, 2017 CAD ($) Options
Telus International (Cda) Inc. share options, U.S. $ denominated |  |  |  |
share-based compensation |  |  |  |
Number of share options outstanding, beginning of period | 748,626 | 748,626 | 573,354 | 573,354
Weighted average share price of options outstanding, beginning of period | $ 30.12 | $ 30.12 |  | $ 30.86
Granted (in shares) | 111,281 | 111,281 | 175,272 | 175,272
Granted (in dollars per share) | $ 27.81 |  |  | $ 27.70
Forfeited (in shares) | (1,172) | (1,172) |  |
Forfeited (in dollars per share) | $ | $ 27.70 |  |  |
Number of share options outstanding, end of period | 858,735 | 858,735 | 748,626 | 748,626
Weighted average share price of options outstanding, end of period | $ 29.83 |  | $ 30.12 | $ 30.12
Weighted average remaining contractual life (years) | Y | 8.4 |  |  |
TELUS International (Cda) Inc. share options, Canadian $ denominated |  |  |  |
share-based compensation |  |  |  |
Number of share options outstanding, beginning of period | 53,832 | 53,832 | 53,832 | 53,832
Weighted average share price of options outstanding, beginning of period | $ |  | $ 21.36 |  | $ 21.36
Number of share options outstanding, end of period | 53,832 | 53,832 | 53,832 | 53,832
Weighted average share price of options outstanding, end of period | $ |  | $ 21.36 |  | $ 21.36
Weighted average remaining contractual life (years) | Y | 7.5 |  |  |
Minimum | TELUS International (Cda) Inc. share options |  |  |  |
share-based compensation |  |  |  |
Variable payout (as a percent) | 0.00% |  |  |
Minimum | Telus International (Cda) Inc. share options, U.S. $ denominated |  |  |  |
share-based compensation |  |  |  |
Option price | $ | $ 21.90 |  |  |
Maximum | TELUS International (Cda) Inc. share options |  |  |  |
share-based compensation |  |  |  |
Exercise period | 10 years | 10 years |  |
Variable payout (as a percent) | 100.00% |  |  |
Maximum | Telus International (Cda) Inc. share options, U.S. $ denominated |  |  |  |
share-based compensation |  |  |  |
Option price | $ | $ 40.26 |  |  |

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