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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Components of Accumulated Other Comprehensive Loss | The components of Accumulated other comprehensive loss on the Consolidated Balance Sheets at December 31, 2020 and March 31, 2021 and the changes during the three-month period ended March 31, 2021, are presented net of taxes in the following table.
(Thousands of dollars) | Foreign Currency Translation Gains (Losses) |  | Retirement and Postretirement Benefit Plan Adjustments |  | Deferred Loss on Interest Rate Derivative Hedges |  | Total
Balance at December 31, 2020 | $ | (324,011) |  |  | (275,632) |  |  | (1,690) |  |  | (601,333) |
Components of other comprehensive income (loss): |  |  |  |  |  |  |
Before reclassifications to income and retained earnings | 19,897 |  |  | — |  |  | — |  |  | 19,897 |
Reclassifications to income | — |  |  | 4,136 |  | ¹ | 1,690 |  | ² | 5,826 |
Net other comprehensive income (loss) | 19,897 |  |  | 4,136 |  |  | 1,690 |  |  | 25,723 |
Balance at March 31, 2021 | $ | (304,114) |  |  | (271,496) |  |  | — |  |  | (575,610) |
1 Reclassifications before taxes of $5,252 are included in the computation of net periodic benefit expense for the three-month period ended March 31, 2021. See Note H for additional information. Related income taxes of $1,116 are included in Income tax expense (benefit) for the three-month period ended March 31, 2021. 2 Reclassifications before taxes of $2,140 are included in Interest expense, net, for the three-month period ended March 31, 2021. Related income taxes of $450 are included in Income tax expense (benefit) for the three-month period ended March 31, 2021. See Note L for additional information.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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