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Basis of Presentation and Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to retirement obligations and other liabilities	$ 457,964	$ 517,566	$ 543,220
Increase to retained earnings	3,700,507	3,670,543	3,640,228
Increase to accumulated other comprehensive loss	$ (612,093)	(609,625)	$ (635,292)
Foreign Currency Transactions
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to retirement obligations and other liabilities		1,500
Increase to retained earnings		14,000
Increase to accumulated other comprehensive loss		$ (15,500)

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For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various post employment and postretirement benefits provided to former or inactive employees, their beneficiaries, and covered dependents that is payable after one year (or beyond the operating cycle if longer. Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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