Pension and Postretirement Benefits - Weighted-Average Assumptions Used to Determine Projected Benefit Obligations and Periodic Benefit Cost (Details)	1 Months Ended	12 Months Ended
	Feb. 07, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate for determining projected benefit obligation at December 31	3.57%	2.38%	1.98%	2.79%
Discount rate in effect for determining service cost	3.16%	1.89%	2.10%	3.11%
Discount rate in effect for determining interest cost	3.51%	1.47%	2.48%	3.28%
Weighted average expected long-term return on plan assets	6.56%	5.70%	6.18%	6.70%
Rate of compensation increase for determining projected benefit obligation at December 31	3.00%	2.88%	3.00%	3.00%
Rate of compensation increase for determining net pension cost	3.04%	3.04%	3.00%	3.07%
Postretirement benefit obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate for determining projected benefit obligation at December 31	3.64%	1.80%	1.20%	2.35%
Discount rate in effect for determining interest cost	3.52%	1.20%	2.10%	3.25%