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share-based compensation - TELUS International (Cda) Inc. restricted share units (Details)
12 Months Ended
Feb. 04, 2021
EquityInstruments
Mar. 17, 2020
EquityInstruments
Dec. 31, 2020
EquityInstruments
$ / shares
Dec. 31, 2019
EquityInstruments
$ / shares
Dec. 31, 2019
EquityInstruments
$ / shares
Dec. 31, 2018
EquityInstruments
$ / shares
Dec. 31, 2018
EquityInstruments
$ / shares
share-based compensation              
Share split ratio   2          
TELUS International (Cda) Inc. restricted share units | Shares issued and stock subdivision              
share-based compensation              
Share split ratio 4.5            
TELUS International (Cda) Inc. restricted share units | Maximum              
share-based compensation              
Variable payout (as a percent)     150.00%        
TELUS International (Cda) Inc. restricted share units | Minimum              
share-based compensation              
Variable payout (as a percent)     0.00%        
TELUS International (Cda) Inc. Restricted Share Units US Dollar Denominated              
Number of restricted share units - Non-vested              
Outstanding, beginning of period     2,093,603 2,527,704 2,527,704    
Non-vested       1,186,524 1,186,524    
Vested during the period     (982,395)        
Forfeited and cancelled     (85,532) (83,722) (83,722)    
Outstanding, end of period     1,383,642 2,093,603 2,093,603 2,527,704 2,527,704
Number of restricted share units - vested              
Vested     982,395 1,186,524 1,186,524    
Settled in cash     (982,395) (1,186,524) (1,186,524)    
Weighted average grant-date fair value              
Outstanding, beginning of period, non-vested | $ / shares     $ 6.11 $ 5.71      
Vested | $ / shares     5.95 5.10      
Granted | $ / shares     11.11 7.32      
Settled in cash | $ / shares     5.95 5.10      
Forfeited | $ / shares     7.00 5.94      
Outstanding, end of period, non-vested | $ / shares     $ 7.94 $ 6.11   $ 5.71  
TELUS International (Cda) Inc. Restricted Share Units Canadian Dollar Denominated              
Number of restricted share units - vested              
Vested           145,346 145,346
Settled in cash       (145,346) (145,346)    
Weighted average grant-date fair value              
Vested | $ / shares             $ 4.75
Settled in cash | $ / shares         $ 4.75