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Retirement Plans and Postretirement Medical Benefits (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Change in Benefit Obligation, Plan Assets and the Funded Status of Defined Benefit Pension Plans The benefit obligations and funded status of defined benefit pension plans are as follows:
United StatesForeign
2021202020212020
Accumulated benefit obligation$1,609,125 $1,729,515 $762,558 $829,413 
Projected benefit obligation
Benefit obligation - beginning of year$1,729,959 $1,613,054 $830,674 $746,942 
Service cost102 86 1,528 1,650 
Interest cost42,434 52,103 11,811 13,379 
Actuarial (gain) loss(53,133)185,306 (37,197)76,006 
Foreign currency changes— — (10,747)29,128 
Settlements and curtailments(1,429)(3,854)— (15,171)
Benefits paid(108,425)(116,736)(25,601)(21,260)
Benefit obligation - end of year$1,609,508 $1,729,959 $770,468 $830,674 
Fair value of plan assets
Fair value of plan assets - beginning of year$1,601,786 $1,487,018 $742,639 $668,308 
Actual return on plan assets51,828 225,812 17,929 78,120 
Company contributions5,397 9,546 9,686 9,674 
Settlements and curtailments(1,429)(3,854)— (15,171)
Foreign currency changes— — (7,210)22,968 
Benefits paid(108,425)(116,736)(25,601)(21,260)
Fair value of plan assets - end of year$1,549,157 $1,601,786 $737,443 $742,639 
Amounts recognized in the Consolidated Balance Sheets
Noncurrent asset$— $465 $29,309 $26,053 
Current liability(5,883)(5,843)(1,345)(1,444)
Noncurrent liability(54,468)(122,795)(60,989)(112,644)
Funded status$(60,351)$(128,173)$(33,025)$(88,035)
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets
Information provided in the table below is only for pension plans with an accumulated benefit obligation in excess of plan assets:
United StatesForeign
2021202020212020
Projected benefit obligation$1,609,508 $1,729,638 $59,859 $691,909 
Accumulated benefit obligation$1,609,125 $1,729,194 $59,352 $690,887 
Fair value of plan assets$1,549,157 $1,601,000 $— $577,821 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
Pretax amounts recognized in AOCI consist of:
United StatesForeign
2021202020212020
Net actuarial loss$716,585 $783,211 $301,913 $334,520 
Prior service (credit) cost(149)(209)7,804 8,072 
Transition asset— — (7)(7)
Total$716,436 $783,002 $309,710 $342,585 
Other changes in plan assets and benefit obligations for defined benefit pension plans recognized in other comprehensive income were as follows:
United StatesForeign
2021202020212020
Net actuarial (gain) loss$(27,842)$44,216 $(23,257)$32,103 
Amortization of net actuarial loss(38,233)(32,490)(9,350)(7,842)
Amortization of prior service credit (cost)60 60 (268)(245)
Net transition asset— — — 4 
Settlements and curtailments(551)(1,364)— (5,060)
Total recognized in other comprehensive income $(66,566)$10,422 $(32,875)$18,960 
Other changes in benefit obligation for postretirement medical benefit plans recognized in other comprehensive income were as follows:
20212020
Net actuarial (gain) loss$(22,305)$11,496 
Amortization of net actuarial loss(4,090)(3,198)
Amortization of prior service cost(129)(373)
Total recognized in other comprehensive income$(26,524)$7,925 
Schedule of Costs of Retirement Plans
The components of net periodic benefit cost (income) for defined benefit pension plans were as follows:
United StatesForeign
202120202019202120202019
Service cost$102 $86 $83 $1,528 $1,650 $1,543 
Interest cost42,434 52,103 63,171 11,811 13,379 17,853 
Expected return on plan assets(77,119)(84,719)(92,726)(31,869)(34,391)(34,363)
Amortization of net transition asset— — — — (4)(6)
Amortization of prior service (credit) cost(60)(60)(60)268 245 243 
Amortization of net actuarial loss38,233 32,490 26,146 9,350 7,842 6,337 
Settlements and curtailments551 1,364 2,381 — 5,060 397 
Net periodic benefit cost (income)$4,141 $1,264 $(1,005)$(8,912)$(6,219)$(7,996)
The components of net periodic benefit cost for postretirement medical benefit plans were as follows:
202120202019
Service cost$909 $885 $967 
Interest cost3,755 4,993 6,584 
Amortization of prior service cost 129 373 321 
Amortization of net actuarial loss4,090 3,198 2,026 
Net periodic benefit cost$8,883 $9,449 $9,898 
Schedule of Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs
Weighted-average actuarial assumptions used to determine year end benefit obligations and net periodic benefit cost for defined benefit pension plans include:
202120202019
United States
Used to determine benefit obligations
     Discount rate2.85%2.54%3.34%
     Rate of compensation increaseN/AN/AN/A
Used to determine net periodic benefit cost
     Discount rate2.54%3.34%4.34%
     Expected return on plan assets5.60%6.25%6.75%
     Rate of compensation increaseN/AN/AN/A
Foreign
Used to determine benefit obligations
     Discount rate0.85 %-2.85%0.70 %-2.40%0.65 %-2.95%
     Rate of compensation increase1.50 %-3.65%1.50 %-2.50%1.50 %-2.50%
Used to determine net periodic benefit cost
     Discount rate0.70 %-2.40%0.65 %-2.95%0.75 %-3.55%
     Expected return on plan assets3.50 %-5.75%4.25 %-6.00%4.25 %-6.25%
     Rate of compensation increase1.50 %-2.50%1.50 %-2.50%1.50 %-2.50%
The weighted-average discount rates used to determine end of year benefit obligation and net periodic pension cost include:
202120202019
Discount rate used to determine benefit obligation
U.S.2.80 %2.35 %3.20 %
Canada2.90 %2.50 %3.00 %
Discount rate used to determine net period benefit cost
U.S.2.35 %3.20 %4.20 %
Canada2.50 %3.00 %3.60 %
Schedule of Target Allocation and Percentage of Plan Assets for Domestic Pension Plan Target and actual asset allocations for the U.S. pension plans were as follows:
Target allocationPercent of Plan Assets at December 31,
202220212020
Asset category
Equities20 %18 %33 %
Multi-asset credit3 %3 %— %
Fixed income70 %73 %62 %
Real estate6 %5 %4 %
Private equity1 %1 %1 %
Total100 %100 %100 %
Schedule of Target Allocation and Percentage of Plan Assets for Foreign Pension Plan were as follows:
Target AllocationPercent of Plan Assets at December 31,
202220212020
Asset category
Global equities10 %12 %22 %
Fixed income70 %69 %60 %
Real estate10 %9 %8 %
Diversified growth10 %9 %9 %
Cash— %1 %1 %
Total100 %100 %100 %
Schedule of Fair Value Measurement of Plan Assets
The following tables show the U.S. and foreign pension plans' assets, by level within the fair value hierarchy. The plan asset categories presented in the following tables are subsets of the broader asset allocation categories.

United States Pension Plans
December 31, 2021
Level 1Level 2Level 3Total
Money market funds$— $3,725 $— $3,725 
Equity securities— 195,037 — 195,037 
Commingled fixed income securities— 229,300 — 229,300 
Government and related securities
202,416 26,582 — 228,998 
Corporate debt securities— 771,529 — 771,529 
Mortgage-backed /asset-backed securities— 12,486 — 12,486 
Real estate— — 77,494 77,494 
Securities lending collateral— 145,855 — 145,855 
Total plan assets at fair value $202,416 $1,384,514 $77,494 $1,664,424 
Securities lending payable(145,855)
Investments valued at NAV16,820 
Cash20,569 
Other(6,801)
Fair value of plan assets $1,549,157 


December 31, 2020
Level 1Level 2Level 3Total
Money market funds$— $14,442 $— $14,442 
Equity securities— 323,311 — 323,311 
Commingled fixed income securities— 264,896 — 264,896 
Government and related securities
322,851 22,549 — 345,400 
Corporate debt securities— 586,998 — 586,998 
Mortgage-backed /asset-backed securities— 45,861 — 45,861 
Real estate— — 69,347 69,347 
Securities lending collateral— 151,049 — 151,049 
Total plan assets at fair value $322,851 $1,409,106 $69,347 $1,801,304 
Securities lending payable(151,049)
Investments valued at NAV17,132 
Cash15,449 
Other(81,050)
Fair value of plan assets $1,601,786 
Foreign Plans
December 31, 2021
Level 1Level 2Level 3Total
Money market funds$— $8,577 $— $8,577 
Equity securities— 96,596 — 96,596 
Commingled fixed income securities— 431,845 — 431,845 
Government and related securities
— 46,522 — 46,522 
Corporate debt securities— 33,583 — 33,583 
Real estate— 7,168 52,491 59,659 
Diversified growth funds— — 52,169 52,169 
Total plan assets at fair value $— $624,291 $104,660 $728,951 
Cash7,966 
Other526 
Fair value of plan assets $737,443 

December 31, 2020
Level 1Level 2Level 3Total
Money market funds$— $10,072 $— $10,072 
Equity securities— 166,683 — 166,683 
Commingled fixed income securities— 379,656 — 379,656 
Government and related securities
— 46,268 — 46,268 
Corporate debt securities— 37,002 — 37,002 
Real estate— — 45,275 45,275 
Diversified growth funds— — 50,750 50,750 
Total plan assets at fair value $— $639,681 $96,025 $735,706 
Cash 6,448 
Other485 
Fair value of plan assets$742,639 
Schedule of Changes in Fair Value of Level 3 Assets Domestic
The following table summarizes the changes in the fair value of Level 3 assets:
U.S. PlansForeign Plans
Real estateReal estateDiversified Growth Funds
Balance at December 31, 2019$71,337 $45,335 $47,621 
Realized gains1,554 — — 
Unrealized losses(3,360)(2,134)1,493 
Net purchases, sales and settlements(184)1,221 56 
Foreign currency and other— 853 1,580 
Balance at December 31, 202069,347 45,275 50,750 
Realized gains1,791 — — 
Unrealized gains6,958 6,357 1,995 
Net purchases, sales and settlements(602)1,663 — 
Foreign currency and other— (804)(576)
Balance at December 31, 2021$77,494 $52,491 $52,169 
Schedule of Change in Benefit Obligation, Plan Assets and the Funded Status of Nonpension Benefit Plans The benefit obligation and funded status for postretirement medical benefit plans are as follows:
20212020
Benefit obligation
Benefit obligation - beginning of year$169,210 $164,104 
Service cost909 885 
Interest cost3,755 4,993 
Actuarial (gain) loss(22,305)11,496 
Foreign currency changes123 340 
Benefits paid, net(12,176)(12,608)
Benefit obligation - end of year (1)
$139,516 $169,210 
Fair value of plan assets
Fair value of plan assets - beginning of year$— $— 
Company contribution12,176 12,608 
Benefits paid, net(12,176)(12,608)
Fair value of plan assets - end of year$— $— 
Amounts recognized in the Consolidated Balance Sheets
Current liability$(12,841)$(15,372)
Non-current liability(126,675)(153,838)
Funded status$(139,516)$(169,210)
(1)    The benefit obligation for U.S. postretirement medical benefits plan was $126 million and $153 million at December 31, 2021 and 2020, respectively.

Pretax amounts recognized in AOCI consist of:
20212020
Net actuarial loss$15,175 $41,570 
Prior service cost— 129 
Total$15,175 $41,699 
Schedule of Expected Benefit Payments
The following benefit payments, which reflect expected future service, are expected to be paid.
Pension BenefitsPostretirement Medical Benefits
2022$130,497 $12,854 
2023131,204 12,338 
2024124,812 11,819 
2025125,765 11,299 
2026123,679 10,778 
Thereafter601,374 45,383 
$1,237,331 $104,471