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Share-based Payments (Summary of Share Unit Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 253,636 312,193  
Granted, Shares   63,971 312,193
Vested and settled, Shares (125,430) (67,018)  
Forfeited, Shares   (55,510)  
Outstanding ending balance, Shares 128,206 253,636 312,193
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 70.41 $ 71.09  
Granted, Weighted average grant date fair value (per share)   68.39 $ 71.09
Forfeited, Weighted average grant date fair value (per share)   71.09  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 70.19 $ 70.41 $ 71.09
Performance Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 523,618 542,676 428,724
Granted, Shares 236,855 160,713 303,829
Vested and settled, Shares (93,241) (161,248) (156,238)
Forfeited, Shares (4,598) (18,523) (33,639)
Outstanding ending balance, Shares 662,634 523,618 542,676
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 45.90 $ 38.09 $ 32.89
Granted, Weighted average grant date fair value (per share) 58.53 57.67 42.09
Vested and settled, Weighted average grant date fair value (per share) 36.42 31.14 31.94
Forfeited, Weighted average grant date fair value (per share) 51.76 47.58 36.60
Outstanding ending balance, Weighted average grant date fair value (per share) $ 51.71 $ 45.90 $ 38.09
Performance Share Units With Market Conditions [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 88,305    
Granted, Shares 14,574 88,305  
Outstanding ending balance, Shares 102,879 88,305  
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 65.45    
Granted, Weighted average grant date fair value (per share) 69.92 $ 65.45  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 66.08 $ 65.45  
Restricted Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 79,112 134,937 237,420
Granted, Shares 34,495 46,675 45,781
Vested and settled, Shares (37,714) (93,426) (98,542)
Forfeited, Shares (7,869) (9,074) (49,722)
Outstanding ending balance, Shares 68,024 79,112 134,937
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 54.96 $ 39.14 $ 29.72
Granted, Weighted average grant date fair value (per share) 57.71 60.98 51.36
Vested and settled, Weighted average grant date fair value (per share) 50.29 35.04 27.68
Forfeited, Weighted average grant date fair value (per share) 60.30 55.81 28.14
Outstanding ending balance, Weighted average grant date fair value (per share) $ 58.32 $ 54.96 $ 39.14
Deferred Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 156,589 137,514 118,368
Granted, Shares 21,824 19,075 19,146
Vested and settled, Shares (70,048)    
Forfeited, Shares    
Outstanding ending balance, Shares 108,365 156,589 137,514
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 35.28 $ 32.06 $ 29.64
Granted, Weighted average grant date fair value (per share) 58.24 58.48 47.01
Vested and settled, Weighted average grant date fair value (per share) 36.13    
Forfeited, Weighted average grant date fair value (per share)    
Outstanding ending balance, Weighted average grant date fair value (per share) $ 39.35 $ 35.28 $ 32.06