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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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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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Percentage of plan assets to benefit obligation of defined benefit plan.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Amount of cost for defined contribution plan.

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Retirement Plans and Postretirement Medical Benefits (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Other components of net pension and postretirement (income) cost									$ (1,708)	$ (4,225)	$ 22,425
Income from discontinued operations, net of tax	$ 2,467	$ 616	$ (3,032)	$ 10,064	$ 168,659	$ (8,470)	$ (5,613)	$ (116)	$ 10,115	$ 154,460	60,106
Percent of all foreign plan assets									78.00%
Assumed health care cost trend rate	7.00%				6.50%				7.00%	6.50%
Next year's assumed health care cost trend rate	6.75%								6.75%
Assumed health care cost trend rate decline	5.00%								5.00%
Total contributions to defined contribution plans									$ 28,000
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 17,132				$ 23,608				17,132	$ 23,608
Unfunded Plan \| Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,000								9,000
Nonpension postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0				0				0	0	0
United States
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	6,000								6,000
Fair value of plan assets	1,601,000				1,486,325				$ 1,601,000	$ 1,486,325
United States \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Loss on sale of businesses											45,000
Other components of net pension and postretirement (income) cost											32,000
Income from discontinued operations, net of tax											$ 13,000
Expected return on plan assets									6.25%	6.75%	7.00%
Fair value of plan assets	$ 1,601,786				$ 1,487,018				$ 1,601,786	$ 1,487,018	$ 1,327,034
United States \| Pension Benefits \| Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Funded percentage	1.10%				1.60%				1.10%	1.60%
Foreign
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	$ 9,000								$ 9,000
Fair value of plan assets	577,821				$ 516,634				577,821	$ 516,634
Foreign \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 742,639				$ 668,308				$ 742,639	$ 668,308	$ 562,517