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Share-based payments (Summary of Share Unit Activity) (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Performance Share Units [Member] | Equity Securities [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Shares | shares 542,676
Granted, Shares | shares 137,848
Vested and settled, Shares | shares (161,248)
Forfeited, Shares | shares (10,750)
Outstanding ending balance, Shares | shares 508,526
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 38.09
Granted, Weighted average grant date fair value (per share) | $ / shares 56.81
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 31.14
Forfeited, Weighted average grant date fair value (per share) | $ / shares 48.54
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 45.14
Restricted Share Units [Member] | Equity Securities [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Shares | shares 134,937
Granted, Shares | shares 28,560
Vested and settled, Shares | shares (87,409)
Forfeited, Shares | shares (4,089)
Outstanding ending balance, Shares | shares 71,999
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 39.14
Granted, Weighted average grant date fair value (per share) | $ / shares 56.45
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 33.14
Forfeited, Weighted average grant date fair value (per share) | $ / shares 64.32
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 51.87
Deferred Share Units [Member] | Debt securities  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Shares | shares 137,514
Granted, Shares | shares 4,525
Outstanding ending balance, Shares | shares 142,039
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 32.06
Granted, Weighted average grant date fair value (per share) | $ / shares 52.08
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 32.70