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Employee Benefit Plans - Weighted-Average Rate Assumptions (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Retirement Benefits [Abstract]    
Projected benefit obligations, discount rate 1.56% 2.28%
Net periodic benefit expense, discount rate 1.95% 2.16%
Net periodic benefit expense, expected long-term return on plan assets 2.84% 2.83%