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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2025
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, 2024 and September 30, 2025, and the changes during the nine-month period ended September 30, 2025, 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, 2024$(516,324)$(111,748)$(628,072)
Components of other comprehensive income (loss):
Before reclassifications to income50,528 — 50,528 
Reclassifications to income ¹— 2,613 2,613 
Net other comprehensive income (loss)50,528 2,613 53,141 
Balance at September 30, 2025$(465,796)$(109,135)$(574,931)
1  Reclassifications before taxes of $3.1 million are included in the computation of net periodic benefit expense for the nine-month period ended September 30, 2025. See Note H for additional information. Related income taxes of $0.5 million are included in "Income tax expense” on the Consolidated Statements of Operations for the nine-month period ended September 30, 2025.