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Other Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Shares Purchased in the Open Market For Employees Shares purchased in the open market for employees for the years ended December 31, 2018, 2019, and 2020 were as follows:
 Shares
purchased
Average price
per share
20184,647 $100.34 
20194,918 $126.83 
20207,274 $112.65