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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Compensation expense   $ 1.3 $ 2.9 $ 1.3
Restricted Stock Units Equity Awards [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested awards January 1, 13,126 13,126 0  
Granted   15,931 16,267  
Vested   0 0  
Undistributed vested awards [1]   (1,687) (3,141)  
Nonvested awards December 31,   27,370 13,126 0
Unvested, weighted average grant date fair value per share, beginning balance $ 65.83 $ 65.83    
Granted, weighted average grant date fair value   72.46 $ 65.83  
Undistributed vested awards, weighted average grant date fair value per share [1]   72.46 65.83  
Unvested, weighted average grant date fair value per share, ending balance   $ 69.28 $ 65.83  
Restricted Stock Units Liability Awards [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested awards January 1, 6,064 6,064 7,003  
Granted   0 0  
Vested   (6,064) 0  
Undistributed vested awards [2]   0 (939)  
Nonvested awards December 31,   0 6,064 7,003
Performance Units Liability Awards [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Award vesting period   3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested awards January 1, 13,870 13,870 7,003  
Granted   10,395 10,187  
Vested   (6,064) 0  
Undistributed vested awards [3]   (1,687) (3,320)  
Nonvested awards December 31,   16,514 13,870 7,003
Weighted average fair Value of each nonvested award   $ 76.87 $ 104.76  
Weighted average estimated payout percent based on performance criteria   109.20% 127.40%  
Performance Units Liability Awards [Member] | Maximum [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards to be granted as percentage of target units   200.00%    
Performance Units Liability Awards [Member] | Minimum [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Awards to be granted as percentage of target units   0.00%    
2006 Performance Unit Plan [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Common stock to be issued with plan   0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested awards January 1, 5,760 5,760 17,420  
Granted   0 0  
Vested   (3,756) (11,660)  
Nonvested awards December 31,   2,004 5,760 17,420
2006 Performance Unit Plan [Member] | Performance Shares [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Award vesting period   5 years    
2013 Director Incentive Agreement [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Common stock to be issued with plan   0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested awards January 1, 1,472 1,472 4,286  
Granted   0 0  
Vested   (1,472) (2,814)  
Nonvested awards December 31,   0 1,472 4,286
2013 Director Incentive Agreement [Member] | Performance Shares [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Award vesting period   3 years    
2006 Performance Unit Plan and 2013 Director Incentive Plan [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Cash payments distributed related to awards previously granted and now payable $ 1.8      
2021 Long Term Incentive Plan [Member] | Maximum [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Common stock to be issued with plan   500,000    
[1] Represents restricted stock units that vested but were not distributed to retirement-eligible employees.
[2] Represents restricted stock units that vested but were not distributed to retirement-eligible employees.
[3] Represents performance units that vested but were not distributed to retirement-eligible employees.