Retirement Plans and Postretirement Medical Benefits (Level 3 Gains and Losses) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
United States \| Buy-in annuity contract
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year		$ 0	$ 0
Realized gains		0	0
Unrealized (losses) gains		0	0
Net purchases, sales and settlements		0	0
Buy-in contract purchase	$ 800,000	798,275
Foreign currency and other		0	0
Fair value of plan assets - end of year	798,275	798,275	0
United States \| Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year		45,221	67,256
Realized gains		8,486	6,762
Unrealized (losses) gains		(7,147)	(14,316)
Net purchases, sales and settlements		(39,108)	(14,481)
Buy-in contract purchase		0
Foreign currency and other		0	0
Fair value of plan assets - end of year	7,452	7,452	45,221
Foreign \| Buy-in annuity contract
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year		0	0
Realized gains		0	0
Unrealized (losses) gains		1,165	0
Net purchases, sales and settlements		0	0
Buy-in contract purchase		69,934
Foreign currency and other		1,653	0
Fair value of plan assets - end of year	72,752	72,752	0
Foreign \| Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year		43,930	43,205
Realized gains		0	0
Unrealized (losses) gains		799	406
Net purchases, sales and settlements		(16,993)	1,214
Buy-in contract purchase		0
Foreign currency and other		2,511	(895)
Fair value of plan assets - end of year	30,247	30,247	43,930
Foreign \| Diversified Growth Funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year		48,400	0
Realized gains		0	0
Unrealized (losses) gains		6,503	3,446
Net purchases, sales and settlements		21,359	45,406
Buy-in contract purchase		0
Foreign currency and other		3,882	(452)
Fair value of plan assets - end of year	$ 80,144	$ 80,144	$ 48,400

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount, measured using unobservable input, of increase in plan asset of defined benefit plan from purchase.

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Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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