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Earnings Per Share - Calculation of diluted EPS under Treasury method (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share        
Number of shares 58,247 57,169 57,169 57,169
Range of exercise prices, low end of range (in dollars per share) $ 69.48 $ 87.30 $ 87.30 $ 87.30
Range of exercise prices, high end of range (in dollars per share) $ 91.35 $ 91.35 $ 91.35 $ 91.35