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Employee Benefits - Assumptions (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Retirement Plans |  |  |  |
Benefit obligation: |  |  |  |
Discount rate (as a percent) |  | 5.63% | 3.05% | 2.75%
Net periodic cost: |  |  |  |
Return on assets (as a percent) |  | 4.00% | 5.00% | 5.50%
Retirement Plans | U.S. |  |  |  |
Net periodic cost: |  |  |  |
Discount rate (as a percent) |  | 3.05% | 2.75% | 3.45%
Return on assets (as a percent) |  | 4.00% |  |
Retirement Plans | U.S. | Subsequent event |  |  |  |
Net periodic cost: |  |  |  |
Return on assets (as a percent) | 6.00% |  |  |
Retirement Plans | U.K. |  |  |  |
Net periodic cost: |  |  |  |
Discount rate (as a percent) |  | 1.87% | 1.36% | 1.92%
Return on assets (as a percent) |  | 5.00% |  |
Retirement Plans | U.K. | Subsequent event |  |  |  |
Net periodic cost: |  |  |  |
Return on assets (as a percent) | 5.50% |  |  |
Postretirement Plans |  |  |  |
Benefit obligation: |  |  |  |
Discount rate (as a percent) |  | 5.52% | 2.72% | 2.20%
Net periodic cost: |  |  |  |
Weighted-average healthcare cost rate (as a percent) |  |  |  | 6.00%
Postretirement Plans | U.S. |  |  |  |
Net periodic cost: |  |  |  |
Discount rate (as a percent) |  | 2.72% | 2.20% | 3.08%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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