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Employee Benefit Plans (Actuarial Assumptions Used, Projected Benefit Obligation) (Details)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]      
Weighted average discount rate 2.32% 3.09% 4.13%
Rate of compensation increase 3.00% 3.00% 3.00%