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share-based compensation - TELUS International (Cda) Inc. restricted share units (Details)
12 Months Ended
Dec. 31, 2019
EquityInstruments
$ / shares
Dec. 31, 2019
EquityInstruments
$ / shares
Dec. 31, 2018
EquityInstruments
$ / shares
Dec. 31, 2018
EquityInstruments
$ / shares
TELUS International (Cda) Inc. restricted share units | Maximum        
share-based compensation        
Variable payout (as a percent) 150.00% 150.00%    
TELUS International (Cda) Inc. restricted share units | Minimum        
share-based compensation        
Variable payout (as a percent) 0.00% 0.00%    
TELUS International (Cda) Inc. Restricted Share Units US Dollar Denominated        
Number of restricted share units - Non-vested        
Outstanding, beginning of period 561,712 561,712 374,786 374,786
Issued - initial award 185,810 185,810 197,495 197,495
Vested during the period (263,672) (263,672)    
Forfeited and cancelled (18,605) (18,605) (10,569) (10,569)
Outstanding, end of period 465,245 465,245 561,712 561,712
Number of restricted share units - vested        
Vested 263,672 263,672    
Settled in cash (263,672) (263,672)    
Weighted average grant-date fair value        
Outstanding, beginning of period, non-vested | $ / shares $ 25.68   $ 24.45  
Vested | $ / shares 22.94      
Issued | $ / shares 32.96   28.07  
Settled in cash | $ / shares 22.94      
Forfeited and cancelled | $ / shares 26.75   26.28  
Outstanding, end of period, non-vested | $ / shares $ 27.49   $ 25.68  
TELUS International (Cda) Inc. Restricted Share Units Canadian Dollar Denominated        
Number of restricted share units - vested        
Outstanding, beginning of period 32,299 32,299 32,299 32,299
Settled in cash (32,299) (32,299)    
Outstanding, end of period     32,299 32,299
Weighted average grant-date fair value        
Outstanding, beginning of period, vested | $ / shares   $ 21.36   $ 21.36
Settled in cash | $ / shares   $ 21.36    
Outstanding, end of period, vested | $ / shares       $ 21.36