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Share-Based Payments (Summary of Share Unit Activity) (Details)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Performance Share Units, Equity Classified Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Number of units | shares 243,968
Granted, Number of units | shares 92,934
Vested and settled, Number of units | shares [1]
Forfeited, Number of units | shares
Outstanding ending balance, Number of units | shares 336,902
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 27.48
Granted, Weighted average grant date fair value (per share) | $ / shares 31.68
Vested and settled, Weighted average grant date fair value (per share) | $ / shares [1]
Forfeited, Weighted average grant date fair value (per share) | $ / shares
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 28.64
Performance Share Units, Liability Classified Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Number of units | shares 311,329 [2]
Granted, Number of units | shares 86,162 [2]
Vested and settled, Number of units | shares [1],[2]
Forfeited, Number of units | shares (1,062) [2]
Outstanding ending balance, Number of units | shares 396,429 [2]
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 23.96 [2]
Granted, Weighted average grant date fair value (per share) | $ / shares 31.69 [2]
Vested and settled, Weighted average grant date fair value (per share) | $ / shares [1],[2]
Forfeited, Weighted average grant date fair value (per share) | $ / shares 23.28 [2]
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 25.64 [2]
Vested and not settled, Number of units | shares 49,871
Vested and not settled, Weighted average grant date fair value (per share) | $ / shares $ 23.78
Restricted Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Number of units | shares 160,009
Granted, Number of units | shares 749
Vested and settled, Number of units | shares [1]
Forfeited, Number of units | shares
Outstanding ending balance, Number of units | shares 160,758
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 23.37
Granted, Weighted average grant date fair value (per share) | $ / shares 32.76
Vested and settled, Weighted average grant date fair value (per share) | $ / shares [1]
Forfeited, Weighted average grant date fair value (per share) | $ / shares
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 23.41
Vested and not settled, Number of units | shares 151,589
Vested and not settled, Weighted average grant date fair value (per share) | $ / shares $ 23.38
Deferred Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding beginning balance, Number of units | shares 73,520
Granted, Number of units | shares 4,202
Vested and settled, Number of units | shares [1]
Forfeited, Number of units | shares
Outstanding ending balance, Number of units | shares 77,722
Outstanding beginning balance, Weighted average grant date fair value (per share) | $ / shares $ 25.41
Granted, Weighted average grant date fair value (per share) | $ / shares 32.77
Vested and settled, Weighted average grant date fair value (per share) | $ / shares [1]
Forfeited, Weighted average grant date fair value (per share) | $ / shares
Outstanding ending balance, Weighted average grant date fair value (per share) | $ / shares $ 25.81
[1] Included in this total are 49,871 liability-classified PSUs and 151,589 RSUs that were vested but not settled at March 31, 2017. These vested share units had WA grant date fair values of $23.78 and $23.38 respectively.
[2] Liability-classified PSUs include PSUs awarded under the employee PSU plan and the previous 2013 PSU plan, in place prior to 2015 that are cash-settled and not subject to market vesting conditions.