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Employee Benefit Plans - Schedule of Actuarial Assumptions (Details) - Pension plans
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans    
Net periodic pension cost, Discount rate (as a percent) 2.00% 3.90%
Expected long-term return on plan assets (as a percent) 3.00% 4.00%