Pension and Postretirement Benefit Plans - Significant Weighted Average Assumptions Used in Measurement of Pension Obligations (Details) - Pension Plan [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
UNITED STATES
Pension benefit obligations:
Discount rate	3.21%	4.22%	3.55%
Net periodic benefit cost:
Discount rate	3.41%	2.56%	3.24%
Expected return on plan assets	6.00%	6.00%	6.00%
Foreign Plan [Member]
Pension benefit obligations:
Discount rate	1.72%	2.42%	2.25%
Net periodic benefit cost:
Discount rate	2.50%	2.54%	2.34%
Rate of compensation increase	3.28%	3.21%	3.33%
Expected return on plan assets	4.61%	4.66%	5.92%