Retirement and Benefit Plans - Plan Assumptions (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
For measuring benefit obligations at year end
Discount rate	2.85%	2.26%	3.05%
For measuring net periodic benefit cost
Discount rate	2.26%	3.05%	4.10%
Expected return on plan assets	2.43%	2.64%	5.50%