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Stock-Based Compensation Plans (Details 2) - $ / shares
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Weighted average grant date fair value per award    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (2,126)  
Performance Shares    
Performance awards    
Equity instruments outstanding at the beginning of the period (in shares) 241,921  
Equity instruments granted (in shares) 138,033  
Change in awards based on performance (in shares) (37,469)  
Converted to restricted stock (in shares) (56,545)  
Forfeited (in shares) (240)  
Equity instruments outstanding at the end of the period (in shares) 285,700  
Weighted average grant date fair value per award    
Equity instruments outstanding at the beginning of the period (in dollars per share) $ 195.13  
Grant date fair value per share (in dollars per share) 191.12  
Change in awards based on performance (in dollars per share) 156.00  
Converted to restricted stock (in dollars per share) 156.00  
Forfeited (in dollars per share) 208.35  
Equity instruments outstanding at the end of the period (in dollars per share) $ 206.06  
Grants in period based on total shareholder metrics 69,064  
Grants in period based on financial metrics 68,969  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Dividend yield 3.50%  
Employee and Directors Stock Options    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 28.64  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 5 years  
Dividend yield 3.50%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 27.10%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.81%  
Employee and Directors Stock Options | Stock Option and Incentive Plan 2009    
Weighted average grant date fair value per award    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 302,924 12,506
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 10,380  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (2,126)  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 180.32  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 294,115  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 180.32  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (1,571)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 178.63 $ 129.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price 130.90  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 121.78  
Performance Options    
Weighted average grant date fair value per award    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 4,847