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share-based compensation - TELUS International (Cda) Inc. share options (Details)
12 Months Ended
Feb. 04, 2021
EquityInstruments
Mar. 17, 2020
EquityInstruments
Dec. 31, 2020
Options
$ / shares
Dec. 31, 2020
Options
$ / shares
$ / shares
Dec. 31, 2019
Options
$ / shares
Dec. 31, 2020
Options
$ / shares
Dec. 31, 2019
Options
$ / shares
[1]
Dec. 31, 2018
Options
$ / shares
[1]
Dec. 31, 2018
Options
$ / shares
[1]
share-based compensation                  
Share split ratio | EquityInstruments   2              
Telus International (Cda) Inc. share options, U.S. $ denominated                  
share-based compensation                  
Number of options outstanding | Options     3,922,056 3,922,056 4,484,790 [1] 3,922,056 4,484,790 3,864,308 3,864,308
Weighted average share price of options outstanding [2]     $ 6.94 $ 6.94 $ 6.91 [1]     $ 6.63  
Granted (in shares) | Options         620,482        
Granted (in dollars per share) [2]         $ 8.46        
Exercised (in shares) | Options     (562,734) (562,734)          
Exercised (in dollars per share) [2]     $ 6.21            
Exercisable, end of period (in shares) | Options     3,267,423 3,267,423          
Exercisable, end of period (in dollar per share) [2]     $ 6.58            
Weighted average remaining contractual life (years)     6 years 4 months 24 days 6 years 4 months 24 days          
TELUS International (Cda) Inc. share options, Canadian $ denominated                  
share-based compensation                  
Number of options outstanding | Options     242,244 242,244 242,244 [1] 242,244 242,244 242,244 242,244
Weighted average share price of options outstanding           $ 4.75 $ 4.75   $ 4.75
Exercisable, end of period (in shares) | Options     242,244 242,244          
Exercisable, end of period (in dollar per share)       $ 4.75          
Weighted average remaining contractual life (years)     5 years 7 months 6 days 5 years 7 months 6 days          
Minimum | TELUS International (Cda) Inc. share options                  
share-based compensation                  
Variable payout (as a percent)     0.00% 0.00%   0.00%      
Minimum | Telus International (Cda) Inc. share options, U.S. $ denominated                  
share-based compensation                  
Option price     $ 4.87 $ 4.87          
Exercisable, end of period (in dollar per share)     $ 4.87            
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%   100.00%      
Maximum | Telus International (Cda) Inc. share options, U.S. $ denominated                  
share-based compensation                  
Option price     $ 8.95 $ 8.95          
Exercisable, end of period (in dollar per share)     $ 8.95            
Shares issued and stock subdivision | TELUS International (Cda) Inc. share options                  
share-based compensation                  
Share split ratio | EquityInstruments 4.5                
[1] Amounts reflect retrospective application of February 4, 2021, 4.5-for-one share subdivision which occurred in connection with TELUS International (Cda) Inc.’s initial public offering of shares (see Note 28(d)).
[2] The range of share option prices is US$4.87 - US$8.95 per TELUS International (Cda) Inc. equity share and the weighted average remaining contractual life is 6.4 years.