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share-based compensation - TELUS International (Cda) Inc. share options (Details)
6 Months Ended
Jun. 30, 2020
Options
$ / shares
Jun. 30, 2020
Options
$ / shares
Mar. 31, 2020
Options
$ / shares
Mar. 31, 2020
Options
$ / shares
Telus International (Cda) Inc. share options, U.S. $ denominated        
share-based compensation        
Number of options outstanding | Options 996,620 996,620 996,620 996,620
Weighted average share price of options outstanding $ 31.11   $ 31.11  
Weighted average remaining contractual life (years) 7 years      
TELUS International (Cda) Inc. share options, Canadian $ denominated        
share-based compensation        
Number of options outstanding | Options 53,832 53,832 53,832 53,832
Weighted average share price of options outstanding   $ 21.36   $ 21.36
Weighted average remaining contractual life (years) 5 years 10 months 24 days      
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      
Maximum | TELUS International (Cda) Inc. share options        
share-based compensation        
Exercise period 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