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Share-Based Compensation Plans - Narrative (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized, not yet granted (in shares) 4,600,000    
Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation plan, stock units held (shares) 157,489 198,198  
Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation plan, stock units held (shares) 21,432 19,951  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
The weighted-average fair value per share at grant date $ 70.85 $ 78.28 $ 72.31
Weighted-average discount percent 2.00% 2.00% 2.00%
Vesting period 3 years    
Performance Shares Units PSU      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized, not yet granted (in shares)   204,300  
The weighted-average fair value per share at grant date $ 83.68    
Actual shares earned and distributed (shares)   394,000.0  
TSR PSU      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Performance period 3 years    
Dividend yield 0.00%    
Stock Options | Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 6 years    
Deferred Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
The weighted-average fair value per share at grant date $ 40.46    
The weighted-average grant-date fair value (in dollars per share) $ 40.46 $ 79.69 $ 74.43
Share-based Compensation Award, Three-year Vesting | Internal Metric Performance Share Units (IM PSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 3 years 3 years 3 years
Share-based Compensation Award, Additional Two-year Vesting | Internal Metric Performance Share Units (IM PSU) | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of an employees award 0.00%    
Share-based Compensation Award, Additional Two-year Vesting | Internal Metric Performance Share Units (IM PSU) | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of an employees award 200.00%    
Share-based Compensation Award, Current-year | TSR PSU | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of an employees award 0.00%    
Share-based Compensation Award, Current-year | TSR PSU | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of an employees award 200.00%