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Share-Based Payments (Summary of Share Unit Activity) (Details) - Performance Share Unit Plans [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 670,288 434,248 243,968
Granted, Shares 170,208 240,803 136,073
Transferred to (from) equity awards on modification, Shares   257,659 81,533
Vested and settled, Shares (251,883) (212,263) (27,326)
Forfeited, Shares (159,889) (50,159)  
Outstanding ending balance, Shares 428,724 670,288 434,248
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 31.46 $ 27.83 $ 27.48
Granted, Weighted average grant date fair value (per share) 36.13 35.63 30.28
Transferred to (from) equity awards on modification, WA grant date fair value (per share)   31.30 24.47
Vested and settled, Weighted average grant date fair value (per share) 30.33 33.78 26.82
Forfeited, Weighted average grant date fair value (per share) 33.21 31.41  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 32.89 $ 31.46 $ 27.83
Performance Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares   259,241 311,329
Granted, Shares   98,775
Transferred to (from) equity awards on modification, Shares   (257,659) (81,533)
Vested and settled, Shares   (49,873)
Forfeited, Shares   (1,582) (19,457)
Outstanding ending balance, Shares   259,241
Outstanding beginning balance, Weighted average grant date fair value (per share)   $ 26.38 $ 23.96
Granted, Weighted average grant date fair value (per share)   31.21
Transferred to (from) equity awards on modification, WA grant date fair value (per share)   26.38 24.66
Vested and settled, Weighted average grant date fair value (per share)   23.64
Forfeited, Weighted average grant date fair value (per share)   $ 26.45 26.39
Outstanding ending balance, Weighted average grant date fair value (per share)   $ 26.38
Restricted Share Units [Member] | Equity Securities [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 207,986 125,152
Granted, Shares 36,350 91,251 125,152
Transferred to (from) equity awards on modification, Shares  
Vested and settled, Shares (265)
Forfeited, Shares (6,651) (8,417)
Outstanding ending balance, Shares 237,420 207,986 125,152
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 28.99 $ 26.93
Granted, Weighted average grant date fair value (per share) 35.40 32.10 26.93
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) 31.98
Forfeited, Weighted average grant date fair value (per share) 34.27 32.00
Outstanding ending balance, Weighted average grant date fair value (per share) $ 29.72 $ 28.99 $ 26.93
Restricted Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares   4,666 160,009
Granted, Shares   66 878
Transferred to (from) equity awards on modification, Shares  
Vested and settled, Shares   (4,732) (156,221)
Forfeited, Shares  
Outstanding ending balance, Shares   4,666
Outstanding beginning balance, Weighted average grant date fair value (per share)   $ 26.42 $ 23.37
Granted, Weighted average grant date fair value (per share)   34.70 32.30
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 23.33
Forfeited, Weighted average grant date fair value (per share)  
Outstanding ending balance, Weighted average grant date fair value (per share)   $ 26.42
Deferred Share Units [Member] | Debt securities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding beginning balance, Shares 113,435 93,487 73,520
Granted, Shares 24,810 26,553 19,967
Transferred to (from) equity awards on modification, Shares  
Vested and settled, Shares (19,877) (6,605)  
Forfeited, Shares
Outstanding ending balance, Shares 118,368 113,435 93,487
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 28.16 $ 26.32 $ 25.41
Granted, Weighted average grant date fair value (per share) 35.99 33.42 29.67
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) $ 29.64 $ 28.16 $ 26.32