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Share-based payments (Summary of Share Unit Activity) (Details)
9 Months Ended
Sep. 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 142,847
Vested and settled, Shares | shares (161,248)
Forfeited, Shares | shares (16,878)
Outstanding ending balance, Shares | shares 507,397
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 38.09
Granted, Weighted average grant date fair value (per share) | $ / shares 56.55
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 31.14
Forfeited, Weighted average grant date fair value (per share) | $ / shares 47.36
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 45.18
Performance Share Units With Market Conditions [Member] | Equity Securities [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, Shares | shares 88,305
Outstanding ending balance, Shares | shares 88,305
Granted, Weighted average grant date fair value (per share) | $ / shares $ 65.45
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 65.45
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 29,805
Vested and settled, Shares | shares (88,348)
Forfeited, Shares | shares (6,347)
Outstanding ending balance, Shares | shares 70,047
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 39.14
Granted, Weighted average grant date fair value (per share) | $ / shares 56.55
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 33.20
Forfeited, Weighted average grant date fair value (per share) | $ / shares 58.58
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 52.28
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 14,569
Outstanding ending balance, Shares | shares 152,083
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 32.06
Granted, Weighted average grant date fair value (per share) | $ / shares 56.42
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 34.39