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Employee and Retiree Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Plans' Benefit Obligations and Fair Value of Assets and Statement of Funded Status The tables that follow provide a reconciliation of the changes in the plans’ benefit obligations and fair value of assets for the years ended December 31, 2021 and 2020 and a statement of the funded status as of December 31, 2021 and 2020.
Pension
Benefits		Other
Postretirement
Benefits
(Thousands of dollars)
2021202020212020
Change in benefit obligation
Obligation at January 1$981,467 883,269 108,378 108,401 
Service cost8,199 7,967 1,295 1,373 
Interest cost14,784 21,127 2,071 2,626 
Participant contributions— — 2,648 2,225 
Actuarial loss (gain)(24,440)107,258 (9,519)3,758 
Medicare Part D subsidy— — 300 243 
Exchange rate changes(1,764)7,074 3 13 
Benefits paid(38,866)(46,066)(4,041)(4,238)
Curtailments— (7,596)— (6,023)
Special termination benefits— 8,434 — — 
Plan amendments— — (5,002)— 
Obligation at December 31939,380 981,467 96,133 108,378 
Change in plan assets
Fair value of plan assets at January 1586,720 547,484 — — 
Actual return on plan assets33,687 48,115 — — 
Employer contributions31,607 30,178 1,093 1,770 
Participant contributions— — 2,648 2,225 
Medicare Part D subsidy— — 300 243 
Exchange rate changes(1,846)7,009 — — 
Benefits paid(38,866)(46,066)(4,041)(4,238)
Fair value of plan assets at December 31611,302 586,720 — — 
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31
Deferred charges and other assets5,535 4,572 — — 
Other accrued liabilities(10,144)(9,468)(4,867)(5,298)
Deferred credits and other liabilities(323,469)(389,851)(91,266)(103,080)
Fund Status and net plan liability recognized at December 31$(328,078)(394,747)(96,133)(108,378)
The preceding tables in this note include the following amounts related to foreign benefit plans.
Pension
Benefits		Other
Postretirement
Benefits
(Thousands of dollars)
2021202020212020
Benefit obligation at December 31$225,117 230,101 526 492 
Fair value of plan assets at December 31218,746 221,463 — — 
Net plan liabilities recognized(6,371)(8,638)(526)(492)
Net periodic benefit expense (benefit)598 437 64 46 
Amounts Included in Accumulated Other Comprehensive Loss Not Recognized in Net Periodic Benefit Expense
At December 31, 2021, amounts included in Accumulated other comprehensive loss (AOCL) in the Consolidated Balance Sheets, before reduction for associated deferred income taxes, which have not been recognized in net periodic benefit expense are shown in the following table.
(Thousands of dollars)
Pension
Benefits		Other
Postretirement
Benefits
Net actuarial gain (loss)$(280,462)13,233 
Prior service cost(2,920)5,002 
$(283,382)18,235 
Projected Benefit Obligations, Accumulated Benefit Obligations and Fair Value of Plan Assets
The table that follows includes projected benefit obligations, accumulated benefit obligations and fair value of plan assets for plans where the accumulated benefit obligation exceeded the fair value of plan assets.
Projected
Benefit Obligations		Accumulated
Benefit Obligations		Fair Value
of Plan Assets
(Thousands of dollars)
202120202021202020212020
Funded qualified plans where accumulated benefit obligation exceeds fair value of plan assets$734,375 762,134 723,887 753,475 589,529 564,238 
Unfunded nonqualified and directors’ plans where accumulated benefit obligation exceeds fair value of plan assets188,713 201,372 188,530 198,792 — — 
Unfunded other postretirement plans96,133 108,378 96,133 108,378 — — 
Components of Net Periodic Benefit Expense
The table that follows provides the components of net periodic benefit expense for each of the three years ended December 31, 2021.
Pension BenefitsOther
Postretirement Benefits
(Thousands of dollars)
202120202019202120202019
Service cost$8,199 7,967 7,964 1,295 1,373 1,559 
Interest cost14,784 21,127 27,835 2,071 2,626 3,864 
Expected return on plan assets(19,222)(24,316)(25,719)— — — 
Amortization of prior service cost (credit)591 640 964 — — — 
Recognized actuarial (gain) loss20,565 22,828 14,106 (29)(31)(193)
Net periodic benefit expense24,917 28,246 25,150 3,337 3,968 5,230 
Termination benefits expense— 8,434 — — — — 
Curtailment expense— 586 — — (1,825)— 
Total net periodic benefit expense$24,917 37,266 25,150 3,337 2,143 5,230 
Weighted-Average Assumptions used in Measurement of Benefit Obligations and Net Periodic Benefit Expense The following table provides the weighted-average assumptions used in the measurement of the Company’s benefit obligations at December 31, 2021 and 2020 and net periodic benefit expense for 2021 and 2020.
Benefit ObligationsNet Periodic Benefit Expense
Pension
Benefits		Other
Postretirement
Benefits		Pension
Benefits		Other
Postretirement
Benefits
December 31,December 31,YearYear
20212020202120202021202020212020
Discount rate2.54 %2.25 %2.86 %2.50 %2.24 %2.75 %2.51 %3.16 %
Expected return on plan assets4.25 %4.43 %— — 4.25 %4.43 %— — 
Rate of compensation increase3.04 %3.04 %— — 3.04 %3.28 %— — 
Benefit Payments Expected to be Paid in Future Years Benefit payments, reflecting expected future service as appropriate, which are expected to be paid in future years from the assets of the plans or by the Company, are shown in the following table.
(Thousands of dollars)
Pension
Benefits		Other
Postretirement
Benefits
2022$45,619 4,867 
202345,714 4,886 
202446,581 4,876 
202546,259 4,835 
202646,830 4,843 
2027-2031240,308 24,295 
Weighted Average Asset Allocation for Funded Pension Benefit Plans The weighted average asset allocation for the Company’s funded pension benefit plans at December 31, 2021 and 2020 are presented in the following table.
December 31,
20212020
Equity securities60.9 %58.1 %
Fixed income securities21.7 24.0 
Alternatives13.5 13.2 
Cash equivalents3.9 4.7 
100.0 %100.0 %
Fair Value Measurements of Retirement Plan Assets At December 31, 2021, the fair value measurements of retirement plan assets within the fair value hierarchy are included in the table that follows.
Fair Value Measurements Using
(Thousands of dollars)
Fair Value at December 31,
2021		Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Domestic Plans
Equity securities:
U.S. core equity$108,422 108,422 — — 
U.S. small/midcap73,222 73,222 — — 
Other alternative strategies47,248 — — 47,248 
International equity47,546 47,546 — — 
Emerging market equity14,937 14,937 — — 
Fixed income securities:
U.S. fixed income92,231 36,888 55,343 — 
Cash and equivalents8,951 8,951 — — 
Total Domestic Plans392,557 289,966 55,343 47,248 
Foreign Plans
Equity securities funds73,642 — 73,642 — 
Fixed income securities funds40,610 — 40,610 — 
Diversified pooled fund54,317 — 54,317 — 
Other35,606 — — 35,606 
Cash and equivalents14,570 — 14,570 — 
Total Foreign Plans218,745 — 183,139 35,606 
Total$611,302 289,966 238,482 82,854 
At December 31, 2020, the fair value measurements of retirement plan assets within the fair value hierarchy are included in the table that follows.
Fair Value Measurements Using
(Thousands of dollars)
Fair Value at December 31,
2020		Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Domestic Plans
Equity securities:
U.S. core equity$67,326 67,326 — — 
U.S. small/midcap28,953 28,953 — — 
Hedged funds and other alternative strategies42,040 — — 42,040 
International commingled trust fund76,095 987 55,433 19,675 
Emerging market commingled equity fund32,058 10,480 21,578 — 
Fixed income securities:
U.S. fixed income92,668 — 92,668 — 
International commingled trust fund9,456 — 9,456 — 
Cash and equivalents16,661 16,661 — — 
Total Domestic Plans365,257 124,407 179,135 61,715 
Foreign Plans
Equity securities funds74,393 — 74,393 — 
Fixed income securities funds45,240 — 45,240 — 
Diversified pooled fund54,871 — 54,871 — 
Other35,970 — — 35,970 
Cash and equivalents10,989 — 10,989 — 
Total Foreign Plans221,463 — 185,493 35,970 
Total$586,720 124,407 364,628 97,685 
Effects of Fair Value Measurements Using Significant Unobservable Inputs on Changes in Level 3 Plan Assets The effects of fair value measurements using significant unobservable inputs on changes in Level 3 plan assets are outlined below:
(Thousands of dollars)
Hedged Funds and Other
Alternative Strategies
Total at December 31, 2019$111,586 
Actual return on plan assets:
Relating to assets held at the reporting date5,694 
Purchases, sales and settlements(19,595)
Total at December 31, 202097,685 
Actual return on plan assets:
Relating to assets held at the reporting date5,206 
Purchases, sales and settlements(20,037)
Total at December 31, 2021$82,854