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Pension And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Components of Company's Net Periodic Benefit Cost
The components of the Company’s net periodic benefit cost were as follows:
Pension BenefitsOther Postretirement Benefits
Three Months Ended June 30,Three Months Ended June 30,
(in thousands of dollars)2024202320242023
Service cost$1,322 $1,282 $24 $25 
Interest cost2,872 2,901 271 264 
Expected return on plan assets(3,607)(3,888)(14)(16)
Net amortization and deferral174 203 (160)(189)
Net periodic benefit cost
$761 $498 $121 $84