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Share-based payments (Summary of Share Unit Activity) (Details) - $ / shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Shares 253,636 312,193
Granted, Shares  
Forfeited, Shares   (55,510)
Outstanding ending balance, Shares 253,636 256,683
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) $ 70.41 $ 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 151,873  
Vested, Shares (93,241)  
Forfeited, Shares (1,165)  
Outstanding ending balance, Shares 581,085  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 45.90  
Granted, Weighted average grant date fair value (per share) 57.52  
Vested and settled, Weighted average grant date fair value (per share) 36.42  
Forfeited, Weighted average grant date fair value (per share) 50.35  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 50.45  
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  
Outstanding ending balance, Shares 88,305  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 65.45  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 65.45  
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 33,440  
Vested, Shares (21,221)  
Forfeited, Shares (866)  
Outstanding ending balance, Shares 90,465  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 54.96  
Granted, Weighted average grant date fair value (per share) 57.67  
Vested and settled, Weighted average grant date fair value (per share) 46.43  
Forfeited, Weighted average grant date fair value (per share) 54.15  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 57.97  
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 5,966  
Outstanding ending balance, Shares 162,555  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 35.28  
Granted, Weighted average grant date fair value (per share) 54.27  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 35.97