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Share-Based Payments (Summary of Share Unit Activity) (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Performance Share Units, Equity Classified Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted, Number of units 6,593  
Forfeited, Number of units (11,663)  
Transferred to (from) equity awards on modification, Number of units 257,934  
Outstanding ending balance, Number of units 252,864  
Granted, Weighted average grant date fair value (per share) $ 30.41  
Forfeited, Weighted average grant date fair value (per share) 27.41  
Transferred to (from) equity awards on modification, WA grant date fair value (per share) 27.34  
Outstanding ending balance, Weighted average grant date fair value (per share) $ 27.43  
Performance Share Units, Liability Classified Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Number of units [1] 421,585 238,573
Granted, Number of units [1] 255,728 218,699
Vested and settled, Number of units [1] (68,683) (6,870)
Forfeited, Number of units [1] (38,341) (28,817)
Transferred to (from) equity awards on modification, Number of units [1] (257,934)  
Outstanding ending balance, Number of units [1] 312,355 421,585
Outstanding beginning balance, Weighted average grant date fair value (per share) [1] $ 24.03 $ 23.38
Granted, Weighted average grant date fair value (per share) [1] 23.25 24.57
Vested and settled, Weighted average grant date fair value (per share) [1] 23.08 22.22
Forfeited, Weighted average grant date fair value (per share) [1] 22.69 23.23
Transferred to (from) equity awards on modification, WA grant date fair value (per share) [1] 23.86  
Outstanding ending balance, Weighted average grant date fair value (per share) [1] $ 23.90 $ 24.03
Restricted Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Number of units 332,954 403,587
Granted, Number of units 3,836 20,528
Vested and settled, Number of units (158,704) (28,887)
Forfeited, Number of units (15,050) (62,274)
Outstanding ending balance, Number of units 163,036 332,954
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 22.70 $ 22.32
Granted, Weighted average grant date fair value (per share) 27.68 26.38
Vested and settled, Weighted average grant date fair value (per share) 22.14 22.53
Forfeited, Weighted average grant date fair value (per share) 22.68 21.56
Outstanding ending balance, Weighted average grant date fair value (per share) $ 23.36 $ 22.70
Deferred Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding beginning balance, Number of units 57,996 42,289
Granted, Number of units 13,489 29,072
Vested and settled, Number of units (1,847) (13,365)
Outstanding ending balance, Number of units 69,638 57,996
Outstanding beginning balance, Weighted average grant date fair value (per share) $ 24.21 $ 22.33
Granted, Weighted average grant date fair value (per share) 27.66 26.07
Vested and settled, Weighted average grant date fair value (per share) 25.28 22.34
Outstanding ending balance, Weighted average grant date fair value (per share) $ 24.85 $ 24.21
[1] Liability-classified PSUs include PSUs awarded under the employee PSU plan, the sign-on grant PSU plan, and other PSUs plans in place prior to 2015 that are cash-settled and not subject to market vesting conditions