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Share-Based Compensation Plans Activity - RSU, PSU, MSU, DSU (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock Units      
Defined Benefit Plan Disclosure [Line Items]      
Discount percent 2.00% 3.00% 3.00%
Shares (in thousands)      
Nonvested balance (shares) 296,500    
Granted (shares) 111,400    
Forfeited (shares) (23,300)    
Vested (shares) (118,800)    
Nonvested balance (shares) 265,800 296,500  
Weighted-Average Grant Date Fair Value Per Share      
Nonvested balance (in dollars per share) $ 27.84    
Granted (in dollars per share) 55.85 $ 29.06 $ 27.09
Forfeited (in dollars per share) 29.96    
Vested (in dollars per share) 26.92    
Nonvested balance (in dollars per share) $ 39.80 $ 27.84  
Performance Shares Units PSU      
Shares (in thousands)      
Nonvested balance (shares) 603,200    
Granted (shares) 220,900    
Forfeited (shares) (18,700)    
Vested (shares) (134,200)    
Nonvested balance (shares) 671,200 603,200  
Weighted-Average Grant Date Fair Value Per Share      
Nonvested balance (in dollars per share) $ 28.02    
Granted (in dollars per share) 54.31    
Forfeited (in dollars per share) 33.08    
Vested (in dollars per share) 24.39    
Nonvested balance (in dollars per share) $ 37.26 $ 28.02  
Market Share Units MSU      
Shares (in thousands)      
Nonvested balance (shares) 141,700    
Granted (shares) 0    
Forfeited (shares) 0    
Vested (shares) (67,500)    
Nonvested balance (shares) 74,200 141,700  
Weighted-Average Grant Date Fair Value Per Share      
Nonvested balance (in dollars per share) $ 27.02    
Granted (in dollars per share) 0.00    
Forfeited (in dollars per share) 0.00    
Vested (in dollars per share) 23.34 $ 23.34  
Nonvested balance (in dollars per share) $ 30.37 $ 27.02  
Deferred Stock Units      
Shares (in thousands)      
Nonvested balance (shares) 29,700    
Granted (shares) 12,700    
Forfeited (shares) (5,500)    
Vested (shares) (26,000)    
Nonvested balance (shares) 10,900 29,700  
Weighted-Average Grant Date Fair Value Per Share      
Nonvested balance (in dollars per share) $ 29.41    
Granted (in dollars per share) 60.80    
Forfeited (in dollars per share) 39.65    
Vested (in dollars per share) 29.42    
Nonvested balance (in dollars per share) $ 60.80 $ 29.41