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Share-based payments (Summary of Share Unit Activity) (Details) - $ / shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Shares 253,636 312,193
Granted, Shares  
Vested, Shares (27,816)  
Forfeited, Shares   (55,510)
Outstanding ending balance, Shares 225,820 256,683
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 70.41 $ 71.09
Granted, Weighted average grant date fair value (per share)  
Forfeited, Weighted average grant date fair value (per share)   71.09
Outstanding ending balance, Weighted average grant date fair value (per share) $ 70.33 $ 71.09
Performance Share Units [Member] | Equity Securities [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Shares 523,618  
Granted, Shares 225,382  
Vested, Shares (93,241)  
Forfeited, Shares (3,474)  
Outstanding ending balance, Shares 652,285  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 45.90  
Granted, Weighted average grant date fair value (per share) 58.66  
Vested and settled, Weighted average grant date fair value (per share) 36.42  
Forfeited, Weighted average grant date fair value (per share) 51.04  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 51.64  
Performance Share Units With Market Conditions [Member] | Equity Securities [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Shares 88,305  
Granted, Shares 14,574  
Outstanding ending balance, Shares 102,879  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 65.45  
Granted, Weighted average grant date fair value (per share) 69.92  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 66.08  
Restricted Share Units [Member] | Equity Securities [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Shares 79,112  
Granted, Shares 33,827  
Vested, Shares (22,349)  
Forfeited, Shares (3,891)  
Outstanding ending balance, Shares 86,699  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 54.96  
Granted, Weighted average grant date fair value (per share) 57.68  
Vested and settled, Weighted average grant date fair value (per share) 46.01  
Forfeited, Weighted average grant date fair value (per share) 61.55  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 58.03  
Deferred Share Units [Member] | Debt securities    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Shares 156,589  
Granted, Shares 12,124  
Outstanding ending balance, Shares 168,713  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 35.28  
Granted, Weighted average grant date fair value (per share) 56.78  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 36.82