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Capital Stock and Equity Compensation (Deferred Stock Units) (Details) - Deferred Stock Units - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Awards Outstanding      
Awards outstanding, beginning balance (in shares) 9,500 12,450 7,150
Awards granted (in shares) 4,800 6,450 10,400
Stock issued (in shares) (7,450) (9,400) (5,100)
Awards outstanding, ending balance (in shares) 6,850 9,500 12,450
Weighted- Average Grant Date Fair Value      
Awards outstanding, beginning balance (in dollars per share) $ 173.82 $ 113.96 $ 170.89
Awards granted (in dollars per share) 272.12 188.60 108.88
Stock issued (in dollars per share) 183.20 104.68 183.40
Awards outstanding, ending balance (in dollars per share) $ 232.51 $ 173.82 $ 113.96