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Share-based payments (Summary of Share Unit Activity) (Details) - Performance Share Unit Plans [Member] - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Performance Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 542,676 428,724 670,288
Granted, Shares 160,713 303,829 170,208
Vested, Shares (161,248) (156,238) (251,883)
Forfeited, Shares (18,523) (33,639) (159,889)
Outstanding ending balance, Shares 523,618 542,676 428,724
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 38.09 $ 32.89 $ 31.46
Granted, Weighted average grant date fair value (per share) 57.67 42.09 36.13
Vested and settled, Weighted average grant date fair value (per share) 31.14 31.94 30.33
Forfeited, Weighted average grant date fair value (per share) 47.58 36.60 33.21
Outstanding ending balance, Weighted average grant date fair value (per share) $ 45.90 $ 38.09 $ 32.89
Performance Share Units With Market Conditions [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Shares 88,305    
Outstanding ending balance, Shares 88,305    
Granted, Weighted average grant date fair value (per share) $ 65.45    
Outstanding ending balance, Weighted average grant date fair value (per share) $ 65.45    
Restricted Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 134,937 237,420 207,986
Granted, Shares 46,675 45,781 36,350
Vested, Shares (93,426) (98,542) (265)
Forfeited, Shares (9,074) (49,722) (6,651)
Outstanding ending balance, Shares 79,112 134,937 237,420
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 39.14 $ 29.72 $ 28.99
Granted, Weighted average grant date fair value (per share) 60.98 51.36 35.40
Vested and settled, Weighted average grant date fair value (per share) 35.04 27.68 31.98
Forfeited, Weighted average grant date fair value (per share) 55.81 28.14 34.27
Outstanding ending balance, Weighted average grant date fair value (per share) $ 54.96 $ 39.14 $ 29.72
Deferred Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 137,514 118,368 113,435
Granted, Shares 19,075 19,146 24,810
Vested, Shares   (19,877)
Forfeited, Shares
Outstanding ending balance, Shares 156,589 137,514 118,368
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 32.06 $ 29.64 $ 28.16
Granted, Weighted average grant date fair value (per share) 58.48 47.01 35.99
Vested and settled, Weighted average grant date fair value (per share)   27.45
Forfeited, Weighted average grant date fair value (per share)
Outstanding ending balance, Weighted average grant date fair value (per share) $ 35.28 $ 32.06 $ 29.64