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share-based compensation - TELUS International (Cda) Inc. restricted share units (Details) | 12 Months Ended
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Dec. 31, 2024 EquityInstruments $ / shares | Dec. 31, 2023 EquityInstruments $ / shares
TELUS International (Cda) Inc. restricted share units | Subset one, variable pay out depending on financial performance and shareholder return |  |
share-based compensation |  |
Total customer connection payout weight (as a percent) | 50.00% |
Relative total shareholder return payout weight (as a percent) | 50.00% |
TELUS International (Cda) Inc. restricted share units | Maximum | Subset one, variable pay out depending on financial performance and shareholder return |  |
share-based compensation |  |
Variable payout (as a percent) | 200.00% |
TELUS International (Cda) Inc. restricted share units | Maximum | Subset two, variable pay out depending on financial performance and shareholder return |  |
share-based compensation |  |
Variable payout (as a percent) | 0.00% |
TELUS International (Cda) Inc. restricted share units | Minimum | Subset one, variable pay out depending on financial performance and shareholder return |  |
share-based compensation |  |
Variable payout (as a percent) | 0.00% |
TELUS International (Cda) Inc. restricted share units | Minimum | Subset two, variable pay out depending on financial performance and shareholder return |  |
share-based compensation |  |
Variable payout (as a percent) | 300.00% |
TELUS International (Cda) Inc. Restricted Share Units US Dollar Denominated |  |
Number of restricted share units - Non-vested |  |
Outstanding, beginning of period - Non-vested | 2,615,746 | 1,605,821
Granted - Initial award | 19,933,019 | 1,567,809
Vested | (1,187,336) | (423,501)
Forfeited | (1,180,493) | (134,383)
Outstanding, end of period - Non-vested | 20,180,936 | 2,615,746
Number of restricted share units - Vested |  |
Outstanding, beginning of period - Vested |  | 0
Granted - Initial award | (528,234) | 770,043
Vested | 1,187,336 | 423,501
Settled in equity | (1,715,570) | (1,193,544)
Outstanding, end of period - Vested | 0 |
Weighted average grant-date fair value |  |
Outstanding, beginning of period, non-vested | $ / shares | $ 21.36 | $ 27.1
Granted - Initial award | $ / shares | 5.3 | 15.34
Vested | $ / shares | 16.85 | 26.49
Settled in equity | $ / shares | 12.72 | 17.01
Forfeited | $ / shares | 12.51 | (23.8)
Outstanding, end of period, non-vested | $ / shares | $ 6.33 | $ 21.36
Restricted share units with total customer connections performance condition |  |
share-based compensation |  |
Total customer connection payout weight (as a percent) | 25.00% |
Restricted share units with total customer connections performance condition | Maximum |  |
share-based compensation |  |
Variable payout (as a percent) | 200.00% |
Restricted share units with total customer connections performance condition | Minimum |  |
share-based compensation |  |
Variable payout (as a percent) | 0.00% |

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