Retirement Plans and Other Employee Benefits - Schedule of Assumptions Used in the Defined Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Qualified pension
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assumptions used calculating benefit obligation, discount rate	5.20%	2.95%	2.63%
Defined benefit plan assumptions used calculating net periodic benefit cost, discount rate	2.96%	2.64%	3.31%
Nonqualified pension
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assumptions used calculating benefit obligation, discount rate	5.10%	2.65%	2.24%
Defined benefit plan assumptions used calculating net periodic benefit cost, discount rate	2.65%	2.24%	3.08%
Other nonqualified pension
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assumptions used calculating benefit obligation, discount rate	4.94%	1.99%	1.41%
Defined benefit plan assumptions used calculating net periodic benefit cost, discount rate	1.99%	1.41%	2.57%
Postretirement benefits | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assumptions used calculating benefit obligation, discount rate	5.04%	2.43%	1.92%
Defined benefit plan assumptions used calculating net periodic benefit cost, discount rate	2.42%	1.93%	2.87%
Postretirement benefits | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assumptions used calculating benefit obligation, discount rate	5.25%	3.07%	2.81%
Defined benefit plan assumptions used calculating net periodic benefit cost, discount rate	5.08%	2.81%	3.44%
Qualified pension/ postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets	2.85%	2.30%	3.45%
Postretirement benefit (retirees post January 1, 1993)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets	5.95%	5.80%	6.40%
Postretirement benefit (retirees prior to January 1, 1993)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets	1.05%	1.00%	0.90%