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Share-based compensation - Disclosure of detailed information about options, valuation assumptions (Details)
12 Months Ended
Dec. 31, 2019
CAD ($)
Month
Dec. 31, 2018
CAD ($)
Month
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Dividend per share 1.00% 1.00%
Expected volatility 34.00% 35.00%
Risk-free interest rate 2.00% 2.00%
Expected life | Month 49 46
Weighted average share price $ 13.51 $ 12.85
Weighted average fair value of options granted $ 3.41 $ 3.37