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Basis of Presentation and Accounting Policies (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase to retirement obligations and other liabilities | $ 497,724 | $ 517,566 | $ 543,221 | $ 529,946
Increase to retained earnings | 3,677,117 | 3,670,543 | 3,640,227 | 3,610,470
Increase to accumulated other comprehensive loss | $ (600,143) | (609,625) | $ (635,292) | $ (653,916)
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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- Definition 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). + References No definition available. + Details
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