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share-based compensation - TELUS International (Cda) Inc. share options (Details)
12 Months Ended
Dec. 31, 2019
Options
$ / shares
Dec. 31, 2019
Options
$ / shares
$ / shares
Dec. 31, 2018
Options
$ / shares
Dec. 31, 2018
Options
$ / shares
Dec. 31, 2017
Options
Telus International (Cda) Inc. share options, U.S. $ denominated          
share-based compensation          
Weighted average share price of options outstanding, beginning of period $ 29.83   $ 30.12    
Granted (in shares) | Options 137,885 137,885 111,281 111,281  
Granted (in dollars per share) $ 38.09   $ 27.81    
Forfeited (in shares) | Options     (1,172) (1,172)  
Forfeited (in dollars per share)     $ 27.70    
Number of options outstanding | Options 996,620 996,620 858,735 858,735 748,626
Weighted average share price of options outstanding, end of period $ 31.11   $ 29.83    
Weighted average remaining contractual life (years) 7 years 8 months 12 days 7 years 8 months 12 days      
TELUS International (Cda) Inc. share options, Canadian $ denominated          
share-based compensation          
Weighted average share price of options outstanding, beginning of period   $ 21.36   $ 21.36  
Number of options outstanding | Options 53,832 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) 6 years 6 months 6 years 6 months      
Minimum | TELUS International (Cda) Inc. share options          
share-based compensation          
Variable payout (as a percent) 0.00% 0.00%      
Minimum | Telus International (Cda) Inc. share options, U.S. $ denominated          
share-based compensation          
Option price $ 21.90 $ 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% 100.00%      
Maximum | Telus International (Cda) Inc. share options, U.S. $ denominated          
share-based compensation          
Option price $ 40.26 $ 40.26