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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2021 and the changes during the nine-month period ended September 30, 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 | 6,534 |  |  | — |  |  | — |  |  | 6,534 |
Reclassifications to income | — |  |  | 12,935 |  | ¹ | 1,690 |  | ² | 14,625 |
Net other comprehensive income (loss) | 6,534 |  |  | 12,935 |  |  | 1,690 |  |  | 21,159 |
Balance at September 30, 2021 | $ | (317,477) |  |  | (262,697) |  |  | — |  |  | (580,174) |
1 Reclassifications before taxes of $16,282 are included in the computation of net periodic benefit expense for the nine-month period ended September 30, 2021. See Note H for additional information. Related income taxes of $3,347 are included in Income tax expense (benefit) for the nine-month period ended September 30, 2021. 2 Reclassifications before taxes of $2,140 are included in Interest expense, net, for the nine-month period ended September 30, 2021. Related income taxes of $450 are included in Income tax expense (benefit) for the nine-month period ended September 30, 2021. See Note L for additional information.

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