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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2026
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Components of Accumulated Other Comprehensive Loss | The components of “Accumulated other comprehensive loss” on the Consolidated Balance Sheets at December 31, 2025 and March 31, 2026, and the changes during the three-month period ended March 31, 2026, are presented net of taxes in the following table.
(Thousands of dollars) | Foreign Currency Translation Gains (Losses) |  | Retirement and Postretirement Benefit Plan Adjustments |  |  |  | Total
Balance at December 31, 2025 | $ | (442,331) |  |  | $ | (111,896) |  |  |  |  | $ | (554,227) |
Components of other comprehensive income (loss): |  |  |  |  |  |  |
Before reclassifications to income | (23,746) |  |  | — |  |  |  |  | (23,746) |
Reclassifications to income ¹ | — |  |  | 1,401 |  |  |  |  | 1,401 |
Net other comprehensive income (loss) | (23,746) |  |  | 1,401 |  |  |  |  | (22,345) |
Balance at March 31, 2026 | $ | (466,077) |  |  | $ | (110,495) |  |  |  |  | $ | (576,572) |
1 Reclassifications before taxes of $1.7 million are included in the computation of net periodic benefit expense for the three-month period ended March 31, 2026. See Note H for additional information. Related income taxes of $0.3 million are included in "Income tax expense” on the Consolidated Statements of Operations for the three-month period ended March 31, 2026.

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