Retirement Plans and Other Postretirement Benefits - Schedule of Net Periodic Benefit Costs and Portion including Portion Charged to Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amortization of:
Portion of costs (credits) charged to expense	$ (12,420)	$ (48,870)	$ (40,648)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	44,153	43,641	39,461
Non-service costs (credits):
Interest cost on benefit obligation	155,121	148,643	153,561
Expected return on plan assets	(178,793)	(188,651)	(182,938)
Amortization of:
Prior service credit	0	0	0
Net actuarial loss (gain)	46,731	41,915	38,420
Net periodic benefit costs (credits)	67,212	45,548	48,504
Portion of costs (credits) charged to expense	38,977	23,652	27,029
Other Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost-benefits earned during the period	8,081	9,955	8,567
Non-service costs (credits):
Interest cost on benefit obligation	20,345	22,169	22,509
Expected return on plan assets	(48,569)	(46,834)	(43,486)
Amortization of:
Prior service credit	(1,265)	(37,789)	(37,789)
Net actuarial loss (gain)	(11,727)	(8,676)	(9,614)
Net periodic benefit costs (credits)	(33,135)	(61,175)	(59,813)
Portion of costs (credits) charged to expense	$ (25,736)	$ (45,557)	$ (43,408)