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Employee Benefit Plans (Actuarial Assumptions Used, Net Periodic Pension Cost) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]      
Weighted average discount rate 3.09% 4.13% 3.49%
Rate of compensation increase 3.00% 3.00% 3.00%
Expected long-term rate of return 6.00% 6.50% 6.50%