Postretirement Benefit Plans - Weighted Average Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
U.S. | Defined benefit plan
Weighted average assumptions used to determine benefit obligations:
Discount rate (in percent)	2.81%	3.62%
Long-term pay progression (in percent)	3.70%	3.30%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (in percent)	3.42%	4.35%
Long term rate of return on plan assets (in percent)	4.00%	4.90%
Long-term pay progression (in percent)	3.30%	3.30%
U.S. | Retiree health care plan
Weighted average assumptions used to determine benefit obligations:
Discount rate (in percent)	2.74%	3.63%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (in percent)	3.63%	4.30%
Long term rate of return on plan assets (in percent)	3.50%	4.40%
Non-U.S. | Defined benefit plan
Weighted average assumptions used to determine benefit obligations:
Discount rate (in percent)	1.31%	1.46%
Long-term pay progression (in percent)	3.15%	3.06%
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate (in percent)	1.46%	1.85%
Long term rate of return on plan assets (in percent)	2.93%	3.62%
Long-term pay progression (in percent)	3.06%	3.03%