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RETIREMENT BENEFIT PALNS - Defined Benefit Plan, Assumptions (Details) | 12 Months Ended
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Dec. 31, 2022 Rate | Dec. 31, 2021
Pension Benefits |  |
Weighted-average assumptions used to determine pension benefit obligation: |  |
Discount rate | 5.31% | 3.02%
Rate of compensation increase | 3.50% | 3.50%
Weighted-average assumptions used to determine net periodic pension and postretirement costs: |  |
Discount rate | 3.02% | 2.88%
Rate of compensation increases | 3.50% | 3.50%
Average future working lifetime | 11 years 3 days | 10 years 11 months 4 days
Postretirement Benefits |  |
Weighted-average assumptions used to determine pension benefit obligation: |  |
Discount rate | 5.29% | 3.00%
Initial healthcare cost trend rate | 5.80% |
Pre-Med healthcare cost trend rate |  | 10.00%
Medicare healthcare cost trend rate |  | 3.00%
Ultimate healthcare cost trend rate | 0.0394 | 0.0394
Year ultimate healthcare cost trend rate is reached | 2075 | 2075
Weighted-average assumptions used to determine net periodic pension and postretirement costs: |  |
Discount rate | 3.00% | 2.86%
Average future working lifetime | 11 years 3 months 25 days | 11 years 4 months 2 days
Initial healthcare cost trend rate | 6.00% | 6.00%
Ultimate healthcare cost trend rate | 3.94% | 3.80%
Year ultimate healthcare cost trend rate is reached | 2075 | 2075

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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 increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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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