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Share-based payments (Summary of Share Unit Activity) (Details)
6 Months Ended
Jun. 30, 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 140,455
Vested and settled, Shares | shares (161,248)
Forfeited, Shares | shares (13,765)
Outstanding ending balance, Shares | shares 508,118
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 38.09
Granted, Weighted average grant date fair value (per share) | $ / shares 56.69
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 31.14
Forfeited, Weighted average grant date fair value (per share) | $ / shares 48.33
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 45.16
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 29,525
Vested and settled, Shares | shares (88,157)
Forfeited, Shares | shares (5,357)
Outstanding ending balance, Shares | shares 70,948
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 39.14
Granted, Weighted average grant date fair value (per share) | $ / shares 56.59
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 33.20
Forfeited, Weighted average grant date fair value (per share) | $ / shares 60.16
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 52.21
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 9,362
Outstanding ending balance, Shares | shares 146,876
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 32.06
Granted, Weighted average grant date fair value (per share) | $ / shares 56.33
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 33.61