XML 45 R32.htm IDEA: XBRL DOCUMENT v3.25.3
Employee and Retiree Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Expense
The table that follows provides the components of net periodic benefit expense for the three-month and nine-month periods ended September 30, 2025 and 2024.
Three Months Ended September 30,
Pension BenefitsOther Postretirement Benefits
(Thousands of dollars)2025202420252024
Service cost$1,683 $1,706 $84 $135 
Interest cost8,495 8,398 708 782 
Expected return on plan assets(8,967)(8,366)— — 
Estimated defined contribution provision62 54 — — 
Amortization of prior service (credit) cost492 579 (133)(133)
Recognized actuarial (gain) loss 1,918 2,363 (1,057)(812)
Total net periodic benefit expense$3,683 $4,734 $(398)$(28)
Nine Months Ended September 30,
Pension BenefitsOther Postretirement Benefits
(Thousands of dollars)2025202420252024
Service cost$5,049 $5,118 $252 $405 
Interest cost25,375 25,182 2,124 2,346 
Expected return on plan assets(26,791)(25,082)— — 
Estimated defined contribution provision184 163 — — 
Amortization of prior service (credit) cost1,475 1,737 (399)(399)
Recognized actuarial (gain) loss5,723 7,084 (3,170)(2,436)
         Total net periodic benefit expense$11,015 $14,202 $(1,193)$(84)