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Share-Based Payments (Summary of Share Unit Activity) (Details)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Performance Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Shares | shares 434,248
Granted, Shares | shares 223,484
Transferred to (from) equity awards on modification, Shares | shares 257,659
Forfeited, Shares | shares (15,519)
Outstanding ending balance, Shares | shares 899,872 [1]
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 27.83
Granted, Weighted average grant date fair value (per share) | $ / shares 31.37
Transferred to (from) equity awards on modification, WA grant date fair value (per share) | $ / shares 31.30
Forfeited, Weighted average grant date fair value (per share) | $ / shares 31.28
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 30.87 [1]
Liability Awards, Outstanding beginning balance, Shares | shares 259,241
Liability Awards, Granted, Shares | shares
Liability Awards, Transferred to (from) equity awards on modification, Shares | shares (257,659)
Liability Awards, Forfeited, Shares | shares (1,582)
Liability Instruments, Outstanding ending balance, Shares | shares [1]
Liability Awards, Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 26.38
Liability Awards, Granted, Weighted average grant date fair value (per share) | $ / shares
Liability Awards, Transferred to (from) equity awards on modification, Weighted average grant date fair value (per share) | $ / shares 26.38
Liability Awards, Forfeited, Weighted average grant date fair value (per share) | $ / shares 26.45
Liability Awards, Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares [1]
Vested and not settled, Number of units | shares 184,329
Vested and not settled, Weighted average grant date fair value (per share) | $ / shares $ 31.99
Restricted Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Shares | shares 125,152
Granted, Shares | shares 88,120
Outstanding ending balance, Shares | shares 213,272 [1]
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 26.93
Granted, Weighted average grant date fair value (per share) | $ / shares 31.98
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 29.02 [1]
Liability Awards, Outstanding beginning balance, Shares | shares 4,666
Liability Awards, Granted, Shares | shares 25
Liability Awards, Transferred to (from) equity awards on modification, Shares | shares
Liability Awards, Forfeited, Shares | shares
Liability Instruments, Outstanding ending balance, Shares | shares 4,691 [1]
Liability Awards, Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 26.42
Liability Awards, Granted, Weighted average grant date fair value (per share) | $ / shares 32.26
Liability Awards, Transferred to (from) equity awards on modification, Weighted average grant date fair value (per share) | $ / shares
Liability Awards, Forfeited, Weighted average grant date fair value (per share) | $ / shares
Liability Awards, Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 26.45 [1]
Deferred Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Liability Awards, Outstanding beginning balance, Shares | shares 93,487
Liability Awards, Granted, Shares | shares 5,475
Liability Awards, Transferred to (from) equity awards on modification, Shares | shares
Liability Awards, Forfeited, Shares | shares
Liability Instruments, Outstanding ending balance, Shares | shares 98,962 [1]
Liability Awards, Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 26.32
Liability Awards, Granted, Weighted average grant date fair value (per share) | $ / shares 32.05
Liability Awards, Transferred to (from) equity awards on modification, Weighted average grant date fair value (per share) | $ / shares
Liability Awards, Forfeited, Weighted average grant date fair value (per share) | $ / shares
Liability Awards, Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 26.64 [1]
[1] Included in this total are 184,329 equity-classified PSUs that were vested but not settled at March 31, 2018. These vested share units had WA grant date fair values of $31.99 respectively.