Retirement Plans and Postretirement Medical Benefits (Narrative) (Details) $ in Thousands, $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2025 CAD ($)	Dec. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Settlements				$ 0	$ 91,339	$ 0
Percent of all foreign plan assets				75.00%
Assumed health care cost trend rate	7.50%			7.50%	6.50%
Next year's assumed health care cost trend rate	7.25%			7.25%
Assumed health care cost trend rate decline	5.00%			5.00%
Total contributions to defined contribution plans				$ 27,000	$ 26,000
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 4,664			4,664	4,940
Unfunded Plan | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,000			6,000	6,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlements					91,000
United States
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	24,000			24,000
United States | Buy-in annuity contract
Defined Benefit Plan Disclosure [Line Items]
Buy-in contract purchase	800,000			798,275
Fair value of plan assets	798,275			798,275	0	0
United States | Buy-in annuity contract | Forecast
Defined Benefit Plan Disclosure [Line Items]
Increase in net periodic pension costs			$ 35,000
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlements				0	88,051	771
Fair value of plan assets	$ 940,928			$ 940,928	$ 958,812	1,153,490
United States | Pension Benefits | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Funded percentage	1.00%			1.00%	1.00%
Foreign
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	$ 7,000			$ 7,000
Foreign | Buy-in annuity contract
Defined Benefit Plan Disclosure [Line Items]
Buy-in contract purchase				69,934
Fair value of plan assets	72,752			72,752	$ 0	0
Foreign | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlements				197	3,373	(25)
Fair value of plan assets	$ 425,845			$ 425,845	$ 408,205	$ 466,687
Canada | Buy-in annuity contract
Defined Benefit Plan Disclosure [Line Items]
Buy-in contract purchase		$ 70
Canada | Buy-in annuity contract | Forecast
Defined Benefit Plan Disclosure [Line Items]
Increase in net periodic pension costs			$ 35,000