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Share-based payments (Summary of Share Unit Activity) (Details)
6 Months Ended
Jun. 30, 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 286,773
Vested and settled, Shares | shares (156,238)
Forfeited, Shares | shares (9,129)
Outstanding ending balance, Shares | shares 550,130
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 32.89
Granted, Weighted average grant date fair value (per share) | $ / shares 41.79
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 31.94
Forfeited, Weighted average grant date fair value (per share) | $ / shares 33.79
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 37.78
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 25,832
Vested and settled, Shares | shares (7,724)
Forfeited, Shares | shares (42,817)
Outstanding ending balance, Shares | shares 212,711
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 29.72
Granted, Weighted average grant date fair value (per share) | $ / shares 40.80
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 36.23
Forfeited, Weighted average grant date fair value (per share) | $ / shares 27.20
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 31.34
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 10,772
Outstanding ending balance, Shares | shares 129,140
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 29.64
Granted, Weighted average grant date fair value (per share) | $ / shares 40.78
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 30.57