Employee Benefit Plans - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension
Assumptions used to determine benefit obligations at December 31:
Discount rate	3.46%	3.99%	3.55%
Rate of compensation increase	2.67%	2.61%	2.60%
Assumptions used to determine net periodic benefit cost for years ended December 31:
Discount rate	3.91%	3.42%	3.77%
Expected long-term return on plan assets	6.37%	6.32%	7.38%
Rate of compensation increase	2.67%	2.61%	2.59%
Postretirement
Assumptions used to determine benefit obligations at December 31:
Discount rate	3.20%	3.82%	3.14%
Rate of compensation increase	3.63%	3.68%	3.10%
Assumptions used to determine net periodic benefit cost for years ended December 31:
Discount rate	3.91%	3.40%	3.64%
Rate of compensation increase	3.63%	3.68%	3.10%