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share-based compensation - TELUS International (Cda) Inc. share options (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Y
Options
Jun. 30, 2018
CAD ($)
Options
Jun. 30, 2018
USD ($)
Y
Options
Jun. 30, 2018
CAD ($)
Options
TELUS International (Cda) Inc. share options        
share-based compensation        
Exercise period     10 years 10 years
Telus International (Cda) Inc. share options, U.S. $ denominated        
share-based compensation        
Number of share options outstanding, beginning of period | Options 747,454 747,454 748,626 748,626
Weighted average share price of options outstanding, beginning of period $ 30.12   $ 30.12  
Forfeited (in shares) | Options     (1,172) (1,172)
Forfeited (in dollars per share)     $ 27.70  
Number of share options outstanding, end of period | Options 747,454 747,454 747,454 747,454
Weighted average share price of options outstanding, end of period $ 30.12   $ 30.12  
Weighted average remaining contractual life (years) | Y 8.7   8.7  
TELUS International (Cda) Inc. share options, Canadian $ denominated        
share-based compensation        
Number of share options outstanding, beginning of period | Options 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 | Options 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 8.0   8.0  
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        
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