Pension Plans and Other Postretirement Benefits - Weighted Average Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assumptions used to determine benefit obligations
Discount rate	2.80%	2.50%
Assumptions used to determine net benefit costs
Discount rate	1.80%	2.90%	4.00%
Expected long-term rate of return on plan assets	4.80%	6.30%	6.50%