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Stock Compensation Plans (Restricted Stock Units) (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restricted Stock Units (RSUs)      
Share Activity      
Shares awarded but not earned/ vested at January 1 (in shares) 213,198    
Shares awarded (in shares) 117,840    
Shares forfeited (in shares) (9,293)    
Shares vested or earned (in shares) (107,798)    
Shares awarded but not earned/ vested at December 31 (in shares) 213,947 213,198  
Weighted-Average Grant Date Fair Value      
Shares awarded but not earned/ vested at January 1 (in dollars per share) $ 104.62    
Shares awarded (in dollars per share) 134.63 $ 109.09 $ 113.91
Shares forfeited (in dollars per share) 120.39    
Shares vested or earned (in dollars per share) 98.95    
Shares awarded but not earned/ vested at December 31 (in dollars per share) $ 122.48 $ 104.62  
Restricted Stock Units (RSUs) | Certain executives based on a total margin improvement metric relative to defined peer group      
Share Activity      
Shares awarded (in shares) 5,017    
Shares vested or earned (in shares) (5,017)    
Weighted-Average Grant Date Fair Value      
Percentage of additional shares issued 25.00%    
Performance Shares      
Share Activity      
Shares awarded but not earned/ vested at January 1 (in shares) 543,904    
Shares awarded (in shares) 289,742    
Shares forfeited (in shares) (29,786)    
Shares vested or earned (in shares) (232,478)    
Shares awarded but not earned/ vested at December 31 (in shares) 571,382 543,904  
Weighted-Average Grant Date Fair Value      
Shares awarded but not earned/ vested at January 1 (in dollars per share) $ 120.94    
Shares awarded (in dollars per share) 143.63 $ 119.35 $ 123.33
Shares forfeited (in dollars per share) 127.77    
Shares vested or earned (in dollars per share) 123.28    
Shares awarded but not earned/ vested at December 31 (in dollars per share) $ 131.14 $ 120.94