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Employee Stock and Incentive Plans - Performance Shares and Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 28, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Performance Shares [Member]        
Stock-based Compensation [Line Items]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year 8 months 12 days    
Number of Shares [Rollforward]        
As of January 1   85,284 99,585 129,693
Granted [1]   33,304 25,763 60,747
Awarded   0 (25,304) (75,943)
Unearned Grant Award   (33,375) (13,625) 0
Forfeited   (4,552) (1,135) (14,912)
As of December 31   80,661 85,284 99,585
Performance Period (Years)   3 years    
Weighted-Average Grant Date Fair Value [Abstract]        
As of January 1   $ 80.73 $ 72.78 $ 66.12
Granted [1]   73.25 83.17 63.89
Awarded   0 62.03 53.44
Unearned Grant Award   86.09 62.03 0
Forfeited   74.05 79.81 77.14
As of December 31   $ 75.80 $ 80.73 $ 72.78
Restricted Stock Units [Member]        
Stock-based Compensation [Line Items]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year 7 months 6 days    
Number of Shares [Rollforward]        
As of January 1   37,482 39,943 49,771
Granted [2]   16,251 15,169 13,927
Awarded   (23,631) (17,193) (21,110)
Forfeited   (1,961) (437) (2,645)
As of December 31   28,141 37,482 39,943
Performance Period (Years)   3 years    
Weighted-Average Grant Date Fair Value [Abstract]        
As of January 1   $ 77.64 $ 69.30 $ 60.74
Granted [2]   64.97 83.48 74.93
Awarded   74.53 63.41 52.44
Forfeited   74.52 77.52 72.43
As of December 31   $ 73.16 $ 77.64 $ 69.30
Subsequent Event [Member] | Performance Shares [Member]        
Number of Shares [Rollforward]        
Granted 32,000      
Awarded 0      
Performance Period (Years) 3 years      
Granted, Grant Date Fair Value $ 2.2      
Subsequent Event [Member] | Restricted Stock Units [Member]        
Number of Shares [Rollforward]        
Granted 13,000      
Awarded (7,000)      
Granted, Grant Date Fair Value $ 0.8      
Awarded, Grant Date Fair Value $ 0.5      
[1] Shares granted include accrued dividends.
[2] Shares granted include accrued dividends.