Pension, Post-Retirement and Post-Employment Plans - Key Assumptions Used to Determine Net Periodic Benefit Expense (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Domestic | Pension Plan and SERP
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (percent)	4.40%	3.70%	4.20%
Rate of compensation increase	3.50%	3.50%	3.50%
Long-term rate of return (percent)	5.40%	5.40%	5.90%
Domestic | Post-retirement Medical Benefits
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (percent)	4.30%	3.70%	4.20%
Foreign | Pension Plan and SERP
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (percent)	1.50%	1.40%	1.60%
Rate of compensation increase	3.40%	3.40%	3.20%
Long-term rate of return (percent)	1.40%	1.80%	1.70%
Foreign | Post-retirement Medical Benefits
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (percent)	9.20%	9.90%	12.20%