Pension - Assumptions Used for Pension (Details) - Pension Plan	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Discount rate:
Pension benefit obligation	2.49%	3.30%
Pension benefit cost	3.30%	4.23%
Expected long-term return on plan assets:
Pension benefit cost	6.75%	6.75%