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Share-based compensation - Disclosure of detailed information about options, valuation assumptions (Details)
12 Months Ended
Dec. 31, 2021
Month
$ / shares
Dec. 31, 2020
Month
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Dividend per share 1.50% 1.50%
Expected volatility 40.00% 39.00%
Risk-free interest rate 0.70% 0.30%
Expected life | Month 46 46
Weighted average share price $ 13.27 $ 13.51
Weighted average fair value of options granted $ 3.66 $ 3.56