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share-based compensation - TELUS International (Cda) Inc. restricted stock units (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
EquityInstruments
Jun. 30, 2018
CAD ($)
EquityInstruments
Jun. 30, 2018
USD ($)
EquityInstruments
Jun. 30, 2018
CAD ($)
EquityInstruments
TELUS International (Cda) Inc. Restricted Stock Units US Dollar Denominated        
Number of restricted stock units - Non-vested        
Outstanding, beginning of period | EquityInstruments 376,058 376,058 374,786 374,786
Issued - initial award | EquityInstruments 79,186 79,186 81,808 81,808
Forfeited and cancelled | EquityInstruments (2,448) (2,448) (3,798) (3,798)
Outstanding, end of period | EquityInstruments 452,796 452,796 452,796 452,796
Weighted average grant-date fair value        
Outstanding, beginning of period, non-vested | $ $ 24.50   $ 24.45  
Issued - initial award | $ 28.37   28.35  
Forfeited and cancelled | $ 24.53   24.38  
Outstanding, end of period, non-vested | $ $ 25.16   $ 25.16  
TELUS International (Cda) Inc. Restricted Stock Units Canadian Dollar Denominated        
Number of restricted stock units - vested        
Outstanding, beginning of period | EquityInstruments 32,299 32,299 32,299 32,299
Outstanding, end of period | EquityInstruments 32,299 32,299 32,299 32,299
Weighted average grant-date fair value        
Outstanding, beginning of period, vested | $   $ 21.36   $ 21.36
Outstanding, end of period, vested | $   $ 21.36   $ 21.36
Maximum | TELUS International (Cda) Inc. restricted stock units        
share-based compensation        
Variable payout (as a percent) 150.00% 150.00% 150.00% 150.00%
Minimum | TELUS International (Cda) Inc. restricted stock units        
share-based compensation        
Variable payout (as a percent) 0.00% 0.00% 0.00% 0.00%