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Earnings Per Share - Calculation of diluted EPS under Treasury method (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share        
Number of shares 57,169 62,235 57,169 62,235
Range of exercise prices, low end of range (in dollars per share) $ 87.30 $ 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