Employee and Retiree Benefit Plans - Plans' Benefit Obligations and Fair Value of Assets and Statement of Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in plan assets
Beginning balance	$ 450,944
Ending balance	477,809	$ 450,944
Pension Benefits
Change in benefit obligation
Beginning balance	663,073	939,380
Service cost	6,542	7,875	$ 8,199
Interest cost	34,140	22,747	14,784
Participant contributions	0	0
Actuarial loss (gain)	26,625	(238,407)
Medicare Part D subsidy	0	0
Exchange rate changes	6,089	(21,018)
Benefits paid	(56,296)	(47,504)
Plan amendments	18,978	0
Ending balance	699,151	663,073	939,380
Change in plan assets
Beginning balance	450,944	611,302
Actual return on plan assets	39,953	(133,395)
Employer contributions	37,546	41,145
Participant contributions	0	0
Medicare Part D subsidy	0	0
Exchange rate changes	5,662	(20,604)
Benefits paid	(56,296)	(47,504)
Ending balance	477,809	450,944	611,302
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31
Deferred charges and other assets	3,192	3,584
Other accrued liabilities	(10,219)	(9,693)
Deferred credits and other liabilities	(214,315)	(206,020)
Funded status and net plan liability recognized at December 31	(221,342)	(212,129)
Other Postretirement Benefits
Change in benefit obligation
Beginning balance	67,679	96,133
Service cost	495	968	1,295
Interest cost	3,241	2,211	2,071
Participant contributions	2,629	2,283
Actuarial loss (gain)	(5,567)	(29,533)
Medicare Part D subsidy	299	331
Exchange rate changes	2	(20)
Benefits paid	(4,970)	(4,694)
Plan amendments	0	0
Ending balance	63,808	67,679	96,133
Change in plan assets
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	2,042	2,080
Participant contributions	2,629	2,283
Medicare Part D subsidy	299	331
Exchange rate changes	0	0
Benefits paid	(4,970)	(4,694)
Ending balance	0	0	$ 0
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31
Deferred charges and other assets	0	0
Other accrued liabilities	(4,433)	(4,830)
Deferred credits and other liabilities	(59,375)	(62,849)
Funded status and net plan liability recognized at December 31	$ (63,808)	$ (67,679)