Pensions and Other Benefits - Assumptions used to Determine Benefit Obligation and Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Actuarial assumptions used to determine benefit obligations at December 31:
Discount rate	3.01%	2.72%
Increase in compensation rate	2.60%	2.62%
Actuarial assumptions used to determine net periodic benefit cost for the year ended December 31:
Discount rate	2.72%	3.35%	4.41%
Expected annual return on plan assets	6.82%	6.47%	6.50%
Increase in compensation rate	2.60%	2.62%	2.60%
Other Benefits
Actuarial assumptions used to determine benefit obligations at December 31:
Discount rate	3.11%	2.80%
Actuarial assumptions used to determine net periodic benefit cost for the year ended December 31:
Discount rate	2.80%	3.42%	4.47%
Expected annual return on plan assets	4.25%	4.25%	4.25%