Employee Benefit Obligations - Other Postretirement Weighted Average Assumptions (Details) - Other post retirement benefits	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
United States
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	2.79%	2.39%	3.24%
Rate of compensation increase (as a percent)	4.37%	4.50%	4.50%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	2.39%	3.24%	4.35%
Rate of compensation increase (as a percent)	4.50%	4.50%	4.50%
Canada
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	2.75%	2.25%	3.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	2.25%	3.00%	3.50%