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share-based compensation - TELUS International (Cda) Inc. share options (Details) | 12 Months Ended |  |
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Dec. 31, 2024 Options EquityInstruments $ / shares | Dec. 31, 2024 Options EquityInstruments $ / shares $ / shares | Dec. 31, 2023 EquityInstruments Options $ / shares | Dec. 31, 2023 EquityInstruments Options $ / shares $ / shares | Dec. 31, 2024 Options EquityInstruments $ / shares | Dec. 31, 2023 Options EquityInstruments $ / shares
Telus International (Cda) Inc. share options, U.S. $ denominated |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Number of share options outstanding, beginning of period | Options | 2,536,783 | 2,536,783 | 2,677,297 | 2,677,297 |  |
Weighted average share price of options outstanding, beginning of period |  | $ 10.39 |  | $ 10.27 |  |
Granted (in shares) | Options | 2,909,788 | 2,909,788 |  |  |  |
Granted (in dollars per share |  | $ 3.69 |  |  |  |
Number of share options exercised | Options |  |  | 124,337 | 124,337 |  |
Number of share options forfeited | Options | (93,843) | (93,843) | (16,177) | (16,177) |  |
Weighted average share price of options exercised |  |  |  | $ 8.46 |  |
Weighted average share price of options forfeited |  | $ 22.73 |  | $ 5.77 |  |
Number of share options outstanding, end of period | Options | 5,352,728 | 5,352,728 | 2,536,783 | 2,536,783 |  |
Weighted average share price of options outstanding, end of period |  | $ 6.53 |  | $ 10.39 |  |
Number of options exercisable | Options | 2,363,846 | 2,363,846 | 2,316,683 | 2,316,683 | 2,363,846 | 2,316,683
Weighted average share option price, exercisable |  |  |  |  | $ 9.32 | $ 9
TELUS International (Cda) Inc. subordinated voting share options - priced at $3.69 |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Number of share options outstanding, end of period | Options | 2,899,794 | 2,899,794 |  |  |  |
Option price |  |  |  |  | $ 3.69 |
TELUS International (Cda) Inc. subordinated voting share options - priced between US$4.87 and US$8.95 |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Number of options exercisable | Options | 2,096,582 | 2,096,582 |  |  | 2,096,582 |
TELUS International (Cda) Inc. subordinated voting share options - priced at US$25.00 |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Weighted average share option price, exercisable |  |  |  |  | $ 25 |
Weighted average remaining contractual life (years) | 6 years 2 months 12 days | 6 years 2 months 12 days |  |  |  |
TELUS Corporation share options |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Number of share options outstanding, beginning of period | EquityInstruments | 1,778,901 | 1,778,901 | 2,755,300 | 2,755,300 |  |
Weighted average share price of options outstanding, beginning of period | $ 22.35 |  | $ 22.05 |  |  |
Number of share options exercised | EquityInstruments | 101,700 | 101,700 | 774,899 | 774,899 |  |
Number of share options forfeited | EquityInstruments | (157,700) | (157,700) | (201,500) | (201,500) |  |
Weighted average share price of options exercised | $ 21.29 |  | $ 21.35 |  |  |
Weighted average share price of options forfeited | $ 22.08 |  | $ 22.11 |  |  |
Number of share options outstanding, end of period | EquityInstruments | 1,519,501 | 1,519,501 | 1,778,901 | 1,778,901 |  |
Weighted average share price of options outstanding, end of period | $ 22.45 |  | $ 22.35 |  |  |
Number of options exercisable | EquityInstruments | 1,519,501 | 1,519,501 | 1,518,901 | 1,518,901 | 1,519,501 | 1,518,901
Weighted average share option price, exercisable | $ 22.45 | $ 22.45 | $ 21.73 | $ 21.73 |  |
Weighted average share option price, exercisable | $ 23.24 |  | $ 24.67 |  |  |
Weighted average remaining contractual life (years) | 2 years 6 months | 2 years 6 months |  |  |  |
Minimum | TELUS International (Cda) Inc. share options |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Variable payout (as a percent) | 0.00% | 0.00% |  |  | 0.00% |
Minimum | TELUS International (Cda) Inc. subordinated voting share options - priced between US$4.87 and US$8.95 |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Option price |  |  |  |  | $ 4.87 |
Weighted average remaining contractual life (years) | 2 years | 2 years |  |  |  |
Maximum | TELUS International (Cda) Inc. share options |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Exercise period | 10 years | 10 years |  |  |  |
Variable payout (as a percent) | 100.00% | 100.00% |  |  | 100.00% |
Maximum | TELUS International (Cda) Inc. subordinated voting share options - priced at $3.69 |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Weighted average remaining contractual life (years) | 9 years 8 months 12 days | 9 years 8 months 12 days |  |  |  |
Maximum | TELUS International (Cda) Inc. subordinated voting share options - priced between US$4.87 and US$8.95 |  |  |  |  |  |
share-based compensation |  |  |  |  |  |
Option price |  |  |  |  | $ 8.95 |

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