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Share-Based Compensation Plans Share-Based Compensation - Activity - RSU, PSU, MSU, DSU (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted-Average Grant Date Fair Value Per Share      
Target shares (shares) 4,600,000    
Restricted Stock Units      
Shares (in thousands)      
Nonvested, beginning balance (shares) 172,700    
Granted (shares) 178,600    
Forfeited (shares) (12,500)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted Cash to Settle Awards, Weighted Average Grant Date Fair Value $ 72.80    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Converted to Cash Settle Awards (1,300)    
Vested (shares) (85,700)    
Nonvested, ending balance (shares) 251,800 172,700  
Weighted-Average Grant Date Fair Value Per Share      
Nonvested, beginning balance (in dollars per share) $ 71.87    
Granted (in dollars per share) 70.85 $ 78.28 $ 72.31
Forfeited (in dollars per share) 78.86    
Vested (in dollars per share) 67.44    
Nonvested, ending balance (in dollars per share) $ 72.30 $ 71.87  
Performance Shares Units PSU      
Shares (in thousands)      
Nonvested, beginning balance (shares) 564,200    
Granted (shares) 248,400    
Forfeited (shares) (27,000.0)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted Cash to Settle Awards, Weighted Average Grant Date Fair Value $ 65.42    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Converted to Cash Settle Awards (4,600)    
Vested (shares) (204,300)    
Nonvested, ending balance (shares) 576,700 564,200  
Weighted-Average Grant Date Fair Value Per Share      
Nonvested, beginning balance (in dollars per share) $ 70.10    
Granted (in dollars per share) 83.68    
Forfeited (in dollars per share) 76.32    
Vested (in dollars per share) 56.72    
Nonvested, ending balance (in dollars per share) $ 80.43 $ 70.10  
Actual shares earned and distributed (shares)   394,000.0  
Target shares (shares)   204,300  
Deferred Stock Units      
Shares (in thousands)      
Nonvested, beginning balance (shares) 12,100    
Granted (shares) 21,600    
Vested (shares) (12,100)    
Nonvested, ending balance (shares) 21,600 12,100  
Weighted-Average Grant Date Fair Value Per Share      
Nonvested, beginning balance (in dollars per share) $ 79.69    
Granted (in dollars per share) 40.46    
Vested (in dollars per share) 79.69    
Nonvested, ending balance (in dollars per share) $ 40.46 $ 79.69