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Share-based payments (Summary of Share Unit Activity) (Details) - Performance Share Unit Plans [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Performance Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 428,724 670,288 434,248
Granted, Shares 303,829 170,208 240,803
Transferred to (from) equity awards on modification, Shares     257,659
Vested and settled, Shares (156,238) (251,883) (212,263)
Forfeited, Shares (33,639) (159,889) (50,159)
Outstanding ending balance, Shares 542,676 428,724 670,288
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 32.89 $ 31.46 $ 27.83
Granted, Weighted average grant date fair value (per share) 42.09 36.13 35.63
Transferred to (from) equity awards on modification, WA grant date fair value (per share)     31.30
Vested and settled, Weighted average grant date fair value (per share) 31.94 30.33 33.78
Forfeited, Weighted average grant date fair value (per share) 36.60 33.21 31.41
Outstanding ending balance, Weighted average grant date fair value (per share) $ 38.09 $ 32.89 $ 31.46
Performance Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares     259,241
Granted, Shares    
Transferred to (from) equity awards on modification, Shares     (257,659)
Vested and settled, Shares    
Forfeited, Shares     (1,582)
Outstanding ending balance, Shares    
Outstanding beginning balance, Weighted average grant date fair value (per share)     $ 26.38
Granted, Weighted average grant date fair value (per share)    
Transferred to (from) equity awards on modification, WA grant date fair value (per share)     26.38
Vested and settled, Weighted average grant date fair value (per share)    
Forfeited, Weighted average grant date fair value (per share)     $ 26.45
Outstanding ending balance, Weighted average grant date fair value (per share)    
Restricted Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 237,420 207,986 125,152
Granted, Shares 45,781 36,350 91,251
Transferred to (from) equity awards on modification, Shares  
Vested and settled, Shares (98,542) (265)
Forfeited, Shares (49,722) (6,651) (8,417)
Outstanding ending balance, Shares 134,937 237,420 207,986
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 29.72 $ 28.99 $ 26.93
Granted, Weighted average grant date fair value (per share) 51.36 35.40 32.10
Transferred to (from) equity awards on modification, WA grant date fair value (per share)  
Vested and settled, Weighted average grant date fair value (per share) 27.68 31.98
Forfeited, Weighted average grant date fair value (per share) 28.14 34.27 32.00
Outstanding ending balance, Weighted average grant date fair value (per share) $ 39.14 $ 29.72 $ 28.99
Restricted Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares     4,666
Granted, Shares     66
Transferred to (from) equity awards on modification, Shares  
Vested and settled, Shares     (4,732)
Forfeited, Shares  
Outstanding ending balance, Shares    
Outstanding beginning balance, Weighted average grant date fair value (per share)     $ 26.42
Granted, Weighted average grant date fair value (per share)     34.70
Transferred to (from) equity awards on modification, WA grant date fair value (per share)  
Vested and settled, Weighted average grant date fair value (per share)     $ 26.54
Forfeited, Weighted average grant date fair value (per share)  
Outstanding ending balance, Weighted average grant date fair value (per share)    
Deferred Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 118,368 113,435 93,487
Granted, Shares 19,146 24,810 26,553
Transferred to (from) equity awards on modification, Shares  
Vested and settled, Shares   (19,877) (6,605)
Forfeited, Shares
Outstanding ending balance, Shares 137,514 118,368 113,435
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 29.64 $ 28.16 $ 26.32
Granted, Weighted average grant date fair value (per share) 47.01 35.99 33.42
Transferred to (from) equity awards on modification, WA grant date fair value (per share)  
Vested and settled, Weighted average grant date fair value (per share)   27.45 23.16
Forfeited, Weighted average grant date fair value (per share)
Outstanding ending balance, Weighted average grant date fair value (per share) $ 32.06 $ 29.64 $ 28.16