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PENSION AND POSTRETIREMENT BENEFIT PLANS - Assumptions (Details) | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Pension Benefits |  |  |  |
Benefit Obligation Assumptions |  |  |  |
Discount rate | 2.42% | 2.70% | 2.42% | 3.16%
Rate of compensation increase | 4.00% | 4.00% | 4.00% | 4.00%
Net Periodic Benefit Cost Assumptions |  |  |  |
Discount rate | 2.70% | 3.16% |  | 4.22%
Assumed long-term rate of return on assets | 5.42% | 5.42% |  | 6.50%
Rate of compensation increase | 4.00% | 4.00% |  | 4.00%
Postretirement Benefits |  |  |  |
Benefit Obligation Assumptions |  |  |  |
Discount rate | 2.92% | 3.11% | 2.92% | 3.48%
Net Periodic Benefit Cost Assumptions |  |  |  |
Discount rate | 3.11% | 3.48% |  | 4.57%
Assumed health care cost trend rates |  |  |  |
U.S. Consumer Price Index (CPI) increase |  |  | 2.06% | 1.86%
Postretirement Benefits | Union employees |  |  |  |
Assumed health care cost trend rates |  |  |  |
Projected healthcare cost rate in 2028 |  |  | 4.50% |
Projected ultimate health care cost trend rates after 2028 |  |  | 4.50% |
Postretirement Benefits | Union employees | Minimum |  |  |  |
Assumed health care cost trend rates |  |  |  |
Projected healthcare cost rate in 2020 | 6.50% |  | 6.50% |
Postretirement Benefits | Union employees | Maximum |  |  |  |
Assumed health care cost trend rates |  |  |  |
Projected healthcare cost rate in 2020 | 7.00% |  | 7.00% |

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- Definition This element represents the assumed Consumer Price Index (CPI) increase used for projecting health care cost trend rates. + References No definition available. + Details
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- Definition Defined Benefit Plan, Health Care Cost Trend Rate On Ninth Year And Thereafter + References No definition available. + Details
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- Definition The assumed health care cost trend rate for on the eighth year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost 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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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