Benefit Plans - Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension benefits
Weighted average assumptions used in net periodic benefit cost:
Discount rate	2.29%	2.61%	2.70%
Rate of compensation increase	2.41%	2.33%	2.41%
Expected long-term rate of return on assets	4.93%	5.10%	5.54%
Weighted average assumptions used in benefit obligations:
Discount rate	2.48%	2.10%
Rate of compensation increase	2.79%	2.58%
Other retirement benefits
Weighted average assumptions used in net periodic benefit cost:
Discount rate	2.30%	3.20%	4.20%
Weighted average assumptions used in benefit obligations:
Discount rate	2.75%	2.30%