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Employee Benefit Plans - Annual Retirement Plan Expense Assumptions (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.40% 438.00%  
Long-term rate of return on plan assets 5.50% 5.50% 510.00%
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate     3.71%
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate     4.58%