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Percent of All Foreign Plan Assets

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

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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Eligibility age for retiree medical benefits									55 years
Other components of net pension and postretirement cost									$ (4,225)	$ 22,425	$ 5,413
Income from discontinued operations, net of tax	$ 168,659	$ (8,470)	$ (5,613)	$ (116)	$ 817	$ 32,621	$ 15,157	$ 11,511	$ 154,460	60,106	$ 63,489
Percent of all foreign plan assets									77.00%
Fair value of plan assets	$ 516,000				$ 426,000				$ 516,000	$ 426,000
Expected return on plan assets									6.25%	6.25%
Assumed health care cost trend rate	6.50%				7.00%				6.50%	7.00%
Next year's assumed health care cost trend rate	7.00%								7.00%
Assumed health care cost trend rate decline	5.00%								5.00%
Total contributions to defined contribution plans									$ 28,000	$ 31,000
United States
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	$ 9,000								9,000
Fair value of plan assets	1,486,325				$ 1,326,296				$ 1,486,325	$ 1,326,296
Expected return on plan assets									6.75%	7.00%	6.75%
United States \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Loss on sale of businesses									$ 45,000
Other components of net pension and postretirement cost									32,000
Income from discontinued operations, net of tax									13,000
Foreign
Defined Benefit Plan Disclosure [Line Items]
Next year's anticipated total contributions to pension plans	10,000								10,000
Fair value of plan assets	$ 516,634				$ 426,446				$ 516,634	$ 426,446