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Share-based payments (Summary of Share Unit Activity) (Details)
3 Months Ended
Mar. 31, 2020
$ / 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 428,724
Granted, Shares | shares 181,883
Vested and settled, Shares | shares (156,238)
Forfeited, Shares | shares (2,644)
Outstanding ending balance, Shares | shares 451,725
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 32.89
Granted, Weighted average grant date fair value (per share) | $ / shares 41.60
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 31.94
Forfeited, Weighted average grant date fair value (per share) | $ / shares 33.29
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 36.73
Restricted Share Units [Member] | Equity Securities [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Shares | shares 237,420
Granted, Shares | shares 23,163
Vested and settled, Shares | shares (7,539)
Forfeited, Shares | shares (311)
Outstanding ending balance, Shares | shares 252,733
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 29.72
Granted, Weighted average grant date fair value (per share) | $ / shares 41.11
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 36.29
Forfeited, Weighted average grant date fair value (per share) | $ / shares 32.82
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 30.57
Deferred Share Units [Member] | Debt securities  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Shares | shares 118,368
Granted, Shares | shares 5,407
Outstanding ending balance, Shares | shares 123,775
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 29.64
Granted, Weighted average grant date fair value (per share) | $ / shares 40.43
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 30.11