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Share-based compensation plans - Inputs used in the measurement (Details)
12 Months Ended
Dec. 31, 2019
CAD ($)
shares
yr
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of options granted | shares 886,740 1,473,430  
Average strike price $ 15.27 $ 11.32  
Number of options, reporting date | shares 8,617,097 8,820,805 8,324,666
Average strike price, reporting date $ 18.9 $ 22.83  
Stock Option Plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of options granted | shares 886,740    
Expected vesting 0.00%    
Average strike price $ 15.27    
Expected dividend | $ $ 0.08    
Expected volatility 36.00%    
Risk-free interest rate 1.80%    
Expected life of option | yr 4.9    
Expected forfeitures 7.00%    
Weighted average grant date fair values $ 4.92    
Performance Share Unit Plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of options granted | shares 477,250    
Expected vesting 106.00%    
Average strike price $ 0    
Expected dividend | $ $ 0    
Expected volatility 38.00%    
Risk-free interest rate 1.80%    
Expected life of option | yr 3    
Expected forfeitures 12.00%    
Weighted average grant date fair values $ 15.33    
Number of options, reporting date | shares 1,465,618    
Expected vesting, reporting date 80.00%    
Average strike price, reporting date $ 0    
Expected dividend, reporting date | $ $ 0    
Expected volatility, reporting date 31.00%    
Risk free interest rate, reporting date 1.70%    
Expected life of option, reporting date | yr 1.4    
Expected forfeitures, reporting date 10.00%    
Weighted average share price, reporting date $ 10.07    
Restricted Share Unit Plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of options granted | shares 212,496    
Expected vesting 0.00%    
Average strike price $ 15.33    
Expected dividend | $ $ 0    
Expected volatility 0.00%    
Risk-free interest rate 0.00%    
Expected life of option | yr 0    
Expected forfeitures 15.00%    
Weighted average grant date fair values $ 15.33    
Phantom Stock Option Plan [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of options granted | shares 68,890    
Expected vesting 0.00%    
Average strike price $ 15.27    
Expected dividend | $ $ 0.08    
Expected volatility 37.00%    
Risk-free interest rate 1.50%    
Expected life of option | yr 4.5    
Expected forfeitures 8.00%    
Weighted average grant date fair values $ 5.07    
Number of options, reporting date | shares 406,720    
Expected vesting, reporting date 0.00%    
Average strike price, reporting date $ 16.48 $ 17.74  
Expected dividend, reporting date | $ $ 0.08    
Expected volatility, reporting date 35.00%    
Risk free interest rate, reporting date 1.70%    
Expected life of option, reporting date | yr 4    
Expected forfeitures, reporting date 8.00%    
Weighted average share price, reporting date $ 2.14