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Share-based payments (Summary of Share Unit Activity) (Details)
9 Months Ended
Sep. 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 300,595
Vested and settled, Shares | shares (156,238)
Forfeited, Shares | shares (29,863)
Outstanding ending balance, Shares | shares 543,218
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 32.89
Granted, Weighted average grant date fair value (per share) | $ / shares 42.00
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 31.94
Forfeited, Weighted average grant date fair value (per share) | $ / shares 36.39
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 38.01
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 26,610
Vested and settled, Shares | shares (7,911)
Forfeited, Shares | shares (48,243)
Outstanding ending balance, Shares | shares 207,876
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 29.72
Granted, Weighted average grant date fair value (per share) | $ / shares 40.52
Vested and settled, Weighted average grant date fair value (per share) | $ / shares 36.23
Forfeited, Weighted average grant date fair value (per share) | $ / shares 27.85
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 31.29
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 15,427
Outstanding ending balance, Shares | shares 133,795
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 29.64
Granted, Weighted average grant date fair value (per share) | $ / shares 43.29
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 31.21